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Increased use of powder-forged connecting rods in the automotive industry prompted an investigation into the suitability of powders from different suppliers for this application. Specifications developed by North American users call for ultra clean powders to enhance machinability and fatigue life. Powders from four manufacturers were each blended with graphite and lubricant, then pressed, sintered and forged to full density. Metallographic samples were prepared and evaluated for inclusion content. In addition, the powders were mixed to the composition of connecting rods, (C - 0.5%, Cu - 2% and MnS - 0.3%), and were similarly pressed, sintered and forged. Test bars were machined from the forged discs. Uniaxial fatigue tests were performed in the tension-compression mode and strain-life curves were developed. It was determined that all powders examined were very clean and were comparable in their inclusion content.

The trend to production of near net shape components in the automotive industry and the constant crusade for cost reduction has brought powder metallurgy technology to the foreground. Savings of material, energy, manufacturing cost and the avoidance of capital expenditure are some of the principal benefits of this process. This paper is an extension of the previously published report. SAE 850458, which describes P/M components in the automobile. It also includes a new family of parts recently identified by the authors, i.e., sensors used in conjunction with electronics and microcomputers. In addition, progress made in recent years in P/M technology is summarized. This article is written for automotive design engineers to show various new applications of P/M and allow them to take advantage of the potential savings this technology offers.