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Press hardenable ultra high strength steel (UHSS) is commonly used for automotive components to meet crash requirements with minimal mass addition to the vehicle. Press hardenable steel (PHS) is capable of forming complex geometries with deep sections since the forming takes place at elevated temperatures up to 900 degrees Celsius (in the Austenitic phase). This forming process is known as hot-stamping. The most commonly used PHS grade is often referred to as PHS1500. After hot-stamping, it is typically required to have a yield strength greater than 950 MPa and a tensile strength greater than 1300 MPa. Most automotive design and material engineers are familiar with PHS, the hot-stamping process, and their capabilities. What is less known is the capability of 3rd Generation advanced high strength steels (AHSS) which are cold stamped, also capable of forming complex geometry, and are now in the process of, or have recently completed, qualification at most automotive manufacturers.

Presented in this research is methodology for modeling the behavior of an automotive ECU (Electronic Control Unit) to verify in a production system. The methodology of this paper is to verify the defects of ECU products during in a real operation, before the defective ECU equipped to an automobile. The performance of an ECU operation is dependent on not only the specification of a hardware device, but also a software program installed in the memory of an ECU. The software program of an ECU is able to be validated before installation, but the validation process is usually executed in a very controllable environment. In order to consider the software program which is frequently changeable in practice, the verification methodology of ECU products as the hardware device and software program integrated is required for detecting defective ECU products caused by inappropriate software program during in manufacturing processes.

The aim of this work is to investigate the current carburizing heat treatment and subsequently to develop new modified heat treatment with increase of surface hardness and corrosion resistances for next generation of injector parts. Considered parts are stopper (SUS303) and position ring (1.4305) of high pressure injector in powertrain. At first, current carburized components are investigated and resulted: hardness (HV100 mN) 802-959, layer thickness of 17.85-24.59 μm, corrosion resistance was maximum 1 hour at 8.25% NaClO solution. New modified heat treatment is Super Saturated NitroCarburizing (SSNC) which is generated with nitrogen and carbon sourcing gas in temperature range of 350-450°C. The process in detail is: nitrogen purging and heating, activation at 360°C for 1 hour, heating, nitrocarburizing at 450°C for 9 or 12 hours, and cooling. The nitrogen rich S-phase was formed at surface and carbon rich S-phase was formed at subsurface.