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| Application and prospect of powder metallurgy in automobile |
| GAO Yang， XU Yue-feng， TIAN Jie-ping |
| （Dong Feng Peugeot Citroen Automobile Company Ltd.， Wuhan 430056， China） |
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Abstract Powder metallurgy materials are successfully applied for industrialized automobile parts， which broaden their application channels and reduce vehicle cost. The powder metallurgy materials， manufacturing processes and testing items were introduced， the performance requirements of powder metallurgy materials made for automobile parts were described， and some typical application examples were listed. For example， the MA manual transmission gear prepared by F50-N2U2-68 has a density of 6.8 g/cm3 and a hardness of 139 HV5. The key technology is that the gear ring is laser welded to the steel gear seat and then subjected to carbonitriding quenching. After heat treatment， the hardness is （390±70） HV5 and the crushing force is up to 10 780 N， meeting the requirement of a minimum breaking moment of 3 000 N·m， achieving a technical cost reduction of more than 4 million RMB per year. The exhaust valve seat of the engine prepared by the double-layer powder metallurgy material and copper melt leaching process has a porosity of 10%-15% and wear loss of less than 5 μm after 500 h durability test， which can save the cost of 20 RMB per car by replacing the original expensive high alloy elements （including Cr， Mo， W， V， Co， etc.）.
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Received: 15 May 2017
Published: 24 December 2018
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2018, Vol. 28 
