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降低活塞残余奥氏体的研究
Research on Reducing Residual Austenite of Piston
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- DOI:
- 作者:
- 朱庆宝 洪军
ZHU Qingbao;Hong Jun
- 作者单位:
- 安徽海立精密铸造有限公司
Anhui Haili Precision Casting Co., Ltd., Maanshan 243000, China
- 关键词:
- 淬火温度 残余奥氏体 回火硬度
quenching temperature residual austenite tempering hardness
- 摘要:
- 镍铬钼合金活塞是压缩机重要组成部件之一,需要进行热处理才能达到性能要求。目前H公司的热处理工艺为淬火+冰冷+回火,其中冰冷工艺能有效的降低铸件残余奥氏体含量。以某型号活塞铸件为研究对象,通过调整热处理工艺,采用820℃淬火+200℃一次回火4 h,取消冰冷工艺。结果表明,残余奥氏体含量降低到5%左右,达到冰冷处理的水平,硬度基本达到要求。为后续改善提供了方向,对降低制造成本具有重要意义。Ni-Cr-Mo Alloy piston is one of the important components of compressor. Heat treatment is required to meet performance requirements. At present, the heat treatment process of H company is quenching, cryogenic treatment and tempering, the cryogenic treatment process can effectively reduce the residual austenite of casting. Taking a certain type of piston casting as the research object, 820 ℃ quenching and 200 ℃ one time tempering for 4 hrs, the cooling process is eliminated by adjusting the heat treatment process. The results show that the residual austenite content decreased to about 5% and reached the level of cryogenic treatment, and the hardness basically reach the requirements. It provides the direction for the following improvement and is of great significance to reduce the manufacturing cost.