摘要
研究了固溶后组合时效处理对Al-Si-Cu空调压缩机缸体显微组织和硬度的影响。结果表明,缸体固溶后在自然时效和人工时效阶段,硬度随时效时间延长而增加;自然时效14 h后在175℃人工时效9 h出现峰值;自然时效26 h和175℃人工时效6、9 h都分别出现了硬度峰值,此后随着人工时效温度的升高而缓慢降低。最佳的组合时效工艺为自然时效26 h、175℃人工时效9 h,使用这个工艺能获得均匀分布的组织、细化的Al-Si枝晶以及弥散分布的细小GP区和强化相θ＂,硬度值为59.8 HRB。
The effects of combined aging treatment after solution on microstructure and hardness of Al-Si-Cu air conditioning compressor cylinder block were studied. The results show that, in natural aging and artificial aging stage after solid solution, the hardness of the cylinder block increases with aging time lengthening; when artificial aging at 175℃ for 9 h after natural aging of 14 h, the peak value appears; when natural aging is 26 h and artificial aging is 6 and 9 h at 175℃, the hardness peak appears,subsequently, as the artificial aging temperature rises, it decreases slowly. The optimum combination aging process is natural aging for 26 h and the artificial aging at 175℃ for 9 h. Using this process can obtain the homogeneously distributed microstructure, the refined Al-Si dendrites and the dispersed fine GP region and the strengtheningθ＂ phase, and the hardness is 59.8 HRB.
作者
孙满寿
华高
高吉成
刘澄
SUN Manshou;HUA Gao;GAO Jicheng;LIU Cheng(Yangzhou Hengtong Precision Machinery Co.,Ltd.,Yangzhou 225127,China;College of Mechanical Engineering,Yangzhou University,Yangzhou 225127,China)
出处
《热加工工艺》
CSCD
北大核心
2018年第18期235-238,242,共5页
Hot Working Technology
