摘要
采用金相法研究了经 95 0℃奥氏体化的 0 4 1C 1 0Cr 0 2 3Mo(4 2CrMo)钢在 5 5 0～ 380℃盐浴等温处理时贝氏体组织转变。观察结果表明 ,4 2CrMo钢 5 5 0～ 5 10℃等温处理的组织为无碳贝氏体 (粗大条片状贝氏体铁素体 +残留奥氏体组成的整合组织 ) +马氏体 ,4 70℃等温处理为羽毛状上贝氏体 +黑色针状下贝氏体 +马氏体组织 ,380℃为黑色针状下贝氏体 +马氏体组织 ;上贝氏体在奥氏体晶界形核 ,随等温处理的温度降低 ,下贝氏体在奥氏体晶内形核。
The bainitic structure transformation of steel 0.41C-1.0Cr-0.23Mo (42CrMo) austenitized at 950 ℃ and salt bath austempered treatment at 550～380 ℃ has studied by metallographic examination. The observed results showed that the structure of steel 42CrMo austempered at 550～510 ℃ was free carbon bainite (conformity organization of coarse lamellar bainitic ferrite + residual austenite) + martensite, austempered at 470 ℃ was feathery upper bainite + black acicular lower bainite + martensite structure, and austempered at 380 ℃ was black acicular lower bainite + martensite structure; upper bainite nucleated at austenite grain boundary, and with austempering temperature decreased lower bainite nucleated at grain inner.
出处
《特殊钢》
北大核心
2004年第4期21-23,共3页
Special Steel
