摘要
研究了共晶铝硅合金激光熔凝强化工艺的机理，探讨了利用特定温度下的人工时效实验，使多种混合作用的强化分解出来，从而判定其主要的强化机制。研究结果表明，这种熔凝强化工艺是以细晶强化为主，固溶强化为辅，伴有少量第二相强化，可使硬度及耐磨性提高１倍。
Abstract Laser glazing and the strengthening mechanisms of eutectic aluminium-silicon alloys were investigated. The hypoeutectic structure consisting of very fine dendrites was obtained in the treated surface of 0. 5￣2. 0 mm depth after laser f glazing with a power of less than 2kW. The hardness of treated layer increased to 180 HV from 88 HV and the wear resistance was doubled. The properties and microstructures of laser treated lay6r after artificial ageing (>200℃) provided very important evidence for explaining the strengthening mechanisms of the laser glazing. Two kinds 'of strengthening mechanisms, i. e. grain size refinement strengthening and solid solution strengthening, existed in the laser glazed aluminium-silicon alloys, and the former is the main one.
出处
《机械工程材料》
CAS
CSCD
1994年第6期11-13,共3页
Materials For Mechanical Engineering
