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2016-04-13
Event
This symposium provides a forum for researchers and application engineers to disseminate the knowledge and information gained in the area of advanced high-strength and press-hardening steel development and applications in automotive structures, enabling light-weight and durable vehicles with improved safety.
2016-04-13
Event
This symposium provides a forum for researchers and application engineers to disseminate the knowledge and information gained in the area of advanced high-strength and press-hardening steel development and applications in automotive structures, enabling light-weight and durable vehicles with improved safety.
2016-04-12
Event
This session deals with the manufacture of detail parts through laser sintering, stereo lithography, fused deposition modeling, and other emerging technologies. The session will explore technologies and methods for producing net or near net parts in various resins, plastics and metals directly from a CAD model that could employ design architectures that couldn't be achieved by other manufacturing methods.
2016-04-12
Event
This session deals with the manufacture of detail parts through laser sintering, stereo lithography, fused deposition modeling, and other emerging technologies. The session will explore technologies and methods for producing net or near net parts in various resins, plastics and metals directly from a CAD model that could employ design architectures that couldn't be achieved by other manufacturing methods.
2016-04-05
Technical Paper
2016-01-0329
Piyush Bubna, Michael P. Humbert, Marc Wiseman, Enrico Manes
Conventional car manufacturing is extremely capital and energy-intensive. Due to these limitations, major auto manufacturers produce very similar, if not virtually identical, vehicles at very large volumes. This limits potential customization for different users and acts as a barrier to entry for new companies or production techniques. Better understanding of the barriers for low volume production and possible solutions with innovative production techniques is crucial for making low volume vehicles viable and accelerating the adoption of new production techniques and lightweight materials into the competitive marketplace. Additive manufacturing brings benefits of innovative design with minimal capital investment in tooling and hence should be ideal for low and perhaps high volume parts. However the technique is currently process intensive, uses relatively expensive raw materials and has to prove the capability to produce parts of acceptable quality.
2016-04-05
Technical Paper
2016-01-0333
Pavel Lykov PhD, Rustam Baytimerov, Sergey Vaulin, Evgeny Safonov, Dmitry Zherebtsov
Due to its unique physical properties (high thermal and electric conductivity) copper is one of the most interesting materials in point of view of additive manufacturing in particular of Selective Laser Melting (SLM). But because of the low laser radiation absorption, low melting point and high thermal conductivity it is difficult to fabricate of copper components without pores. Results of many research have been shown that for successful Selective Laser Melting of copper powder is needed high laser power (more than 300 W) and high laser scanning speed (more than 600 mm/s). However now most SLM machines are equipped with laser plants with output power up to 200 W. In this research, SLM machine with 200 W maximum power CO2 laser has been used. For determination of the influence of SLM process parameters on quality of copper parts rectangle specimens have been fabricated.
2016-04-05
Technical Paper
2016-01-0355
Takashi Iwama
Dent resistance and surface distortion were deteriorated by reduction of outer panel thickness. While aluminum or resin use for outer panel are increasing, it is not spread in the car of cost low price, steel is used. However, even in vehicles of lower price it has been required weight reduction of body, weight reduction has become necessary with steel using. Therefore, it becomes difficult to reduce automotive body weight. To investigate the weight reduction potential with steel using, effective factors on surface distortion and dent resistance properties were evaluated quantitatively with the aim of securing these properties. Materials used for experiment were tensile strength(TS) 340 MPa grade bake hardenable (BH) steel sheet, which is often used in the door outer and TS 440 MPa grade BH steel sheet for outer panel which developed by JFE Steel.
2016-04-05
Technical Paper
2016-01-0325
Farhan javed, Salman Javed
Additive manufacturing has experienced rapid growth over a span of 25 years. Additive manufacturing involves development of a three dimensional(3D) object by stacking layer upon layer. Conventional machining techniques involve the removal of material. However this technique differentiates itself from other techniques by means of addition of material. The integration of CAD with additive manufacturing has offered the ability to create complex structures. Despite its clear benefits additive manufacturing suffers from high initial investment. Average cost of an entry level commercial 3D printer is 600$. A low cost 3D printer has been designed and built for experimental investigation within a budget of 300$. The paramount process of 3D printing involves a combination of interpreting data from CAD files and controlling the motors using this data. The various design considerations while developing the 3D printer have been discussed.
2016-04-05
Technical Paper
2016-01-0358
Saeid Nasheralahkami, Sergey Golovashchenko, Kaicen Pan, Lindsay Brown, Bindiya Gugnani
In recent years, implementation of advanced high strength steels (AHSS) such as dual phase steels (DP) are increasing in automotive components due to their superior structural performance and vehicle weight reduction capabilities. However, these materials are often sensitive to trimmed edge cracking if stretching along sheared edge occurs in such processes as stretch flanging. Tool wear is another major issue in the trimming of AHSS because of higher contact pressures at the interface between the cutting edges of the trimming die and sheet metal blank defined by AHSS higher flow stresses. Another reason for tool wear is presence of martensitic particles on the surface of the blank. The objective of the present paper is to study the influence of trimming conditions and tool wear on quality and stretchability of trimmed edge of DP980 steel sheet.
2016-04-05
Technical Paper
2016-01-0328
Scott Curran, Paul Chambon, Randall Lind, Lonnie Love, Robert Wagner, Steven Whitted, David Smith, Brian Post, Ronald Graves, Craig Blue, Johney Green, Martin Keller
Rapid vehicle powertrain development has become a technological breakthrough for the design and implementation of vehicles that meet and exceed the fuel efficiency, cost, and performance targets expected by today’s consumer. Recently, advances in large scale additive manufacturing have provided the means to bridge hardware-in-the-loop with preproduction mule chassis testing. This paper details a case study from Oak Ridge National Laboratory bridging the powertrain-in-the-loop development process with vehicle systems implementation using big area additive manufacturing (BAAM). For this case study, the use of a component-in-the-loop laboratory with math-based models is detailed for the design of a battery electric powertrain to be implemented in a printed prototype mule. The ability for BAAM to accelerate the mule development process via the concept of computer-aided design to part is explored.
2016-04-05
Technical Paper
2016-01-0357
Daniel J. Branagan, Andrew E. Frerichs, Brian E. Meacham, Sheng Cheng, Alla V. Sergueeva
The historical development of autobody steels has demonstrated a paradoxical relationship between strength and ductility, with increasing strength necessary for lightweighting commensurate with reductions in ductility necessary for cold formability. This in turn creates geometric constraints in part design and manufacturing, ultimately limiting usage of these higher strength steel grades in automobiles. Attempts to overcome this paradox have focused on quench and tempering including variants such as quench, partitioning, and tempering to increase strength and three distinct deformation mechanisms including; 1) shear band induced plasticity (SIP), 2) transformation induced plasticity (TRIP), and 3) twinning induced plasticity (TWIP) to increase ductility.
2016-04-05
Technical Paper
2016-01-0359
Jeff Wang, Charles Enloe, Jatinder Singh, Curt Horvath
Impact toughness (or resistance to fracture) is a critical material property for press hardened steel because hot-formed steel components are often used to construct the safety cage of vehicle body structures. Prior austenite grain size, as controlled by the hot stamping process, is a key microstructural feature that influences impact toughness of press hardening steel. In this paper, a special Charpy V-notch impact test is developed to quantify the impact toughness of press hardened steel of varying prior austenite grain size by stacking a number of thin sheets via mechanical riveting. Both the ductile-to-brittle transition temperature and upper shelf energy are analyzed in an effort to establish a correlation between impact toughness and prior austenite grain size. Based on this result, impact performance variation of a hot-formed component can be better understood and quantitatively characterized.
2016-04-05
Technical Paper
2016-01-0356
Hua-Chu Shih
Prephosphated steel was developed by applying phosphate coating on zinc coated sheet steel to increase the lubricity in the automotive stamping process. The phosphate coating was also found can further absorb the lubricant which can reduce excess amount of lubricant dripping on the die surface and the press floor. Due to its enhanced lubricity characteristic, the applications have grown rapidly including the lately developed advanced high strength steels (AHSS). For the applications of the AHSS, due to the high strength property, it is crucial to understand their performance under more extreme forming conditions such as higher die temperature, contact pressure and sliding speed, etc. The intent of this study is to investigate the tribological performance and die wear behavior of the prephosphated AHSS under these forming conditions in the die tryout and production conditions.
2016-04-05
Technical Paper
2016-01-0360
Cédric Georges, Xavier Vanden Eynde, Frank Goodwin
Advanced high strength steels used in automotive body and structure applications are exposed to hydrogen during several steps of their processing. For galvanized sheet steel, one of these is the continuous galvanizing process, during which the sheet is prepared for coating in a H2-N2 furnace. This paper shows the relationship between hydrogen uptake in DP600 and DP980 grades, together with an IF steel control composition, and galvanizing process conditions. Hydrogen uptake is strongly dependent on furnace atmosphere and the amount of martensite in the steel but has little dependence on soaking time, humidity of the furnace atmosphere, or temperature within the usual intercritical annealing range. Rapid outgassing was observed during overageing prior to zinc dipping. Slow strain rate tests showed that there was no loss of ductility in galvanized samples that had been treated in a 5% H2 atmosphere or that had been overaged before galvanizing.
2016-04-05
Technical Paper
2016-01-0361
Takeki Matsumoto, Nan Li, Xin Shi, Jianguo Lin
To reduce the fuel consumption as well as to improve the crash safety of vehicles, the usage of hot stamping parts is increasing dramatically in recent years. Aisin Takaoka has produced hot stamping parts since 2001 and has developed various technologies related to Hot Stamping. In an actual hot stamping process, occasionally low strength parts have been obtained even in the proper forming conditions at prototyping phase. In order to understand these phenomena, phase transformations of boron steel during various cooling rate are investigated within the effects of isothermal strain conditions. The uniaxial tensile test with 1.6mm thickness 22MnB5 specimen at strain rates of 0.1-5.0/s, strain level of 0-0.3 and strain applied temperature of 650-800°C are conducted. Dilatometer is used to measure the dimensional changes of the specimen to realize the phase transformation.
2016-04-05
Technical Paper
2016-01-0371
Wenkai Li, Carlos Engler-Pinto, Haitao CUI, Weidong Wen, Xuming Su
In this paper, fatigue tests on a cast aluminum alloy (AS7GU-T64) were performed under different frequencies and humidity levels. Tests conducted under conventional frequency in laboratory air have been compared to tests conducted under ultrasonic frequency in dry air, saturated humidity and in distilled water. It was observed that the highest and lowest fatigue lives corresponded to ultrasonic fatigue tests in dry air and in distilled water, respectively. Unlike specimens tested at conventional frequency, all of the specimens tested under ultrasonic frequency presented a large amount of slip facets on the crack propagation fracture surface.
2016-04-05
Technical Paper
2016-01-0353
Suleman Ahmad, Dimitry Sediako, Anthony Lombardi, C. (Ravi) Ravindran, Robert Mackay, Ahmed Nabawy
For many years, aluminum alloys have been replacing ferrous alloys in automotive applications to reduce the weight of vehicles. One significant area is engine blocks, which are commonly made of hypoeutectic Al-Si alloys containing additions of Cu and Mg. These engine blocks typically contain cast-iron liners to improve wear resistance, however, they introduce residual stress due to thermo-mechanical mismatch. This stress has its highest magnitude in the cylinder bridge area and may lead to cylinder distortion or cracking. Several heat treatment processes are being used in industry to mitigate residual stress. One of these, artificial aging, has been found to be effective in reducing residual stress. In this study, neutron diffraction was used to measure the residual stress profiles along the cylinder bores of 319 Al engine blocks, treated to a T5 condition (aging from as-cast condition).
2016-02-04
Standard
AMS2369C
This specification covers quality assurance sampling procedures which may be used to determine conformance to applicable specification requirements of carbon and low-alloy steel castings.
2016-02-04
WIP Standard
AMS5069G
This specification covers a low-carbon steel in the form of bars, forgings, mechanical tubing, and forging stock.
2016-02-04
WIP Standard
AMS5080K
This specification covers a carbon steel in the form of bars, forgings, mechanical tubing, and forging stock.
Viewing 1 to 30 of 10222

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