采用盐浴炉对硅-锰系Q&P(quenching and partitioning)钢进行了Q&P工艺处理,研究了分配时间对热处理后试验钢显微组织、力学性能、残余奥氏体含量及残余奥氏体中碳含量的影响.结果表明:试验钢的显微组织为板条马氏体和残余奥氏体,残余奥氏体以两种形态分布在不同位置,一种是以薄膜状分布在马氏体板条间,另一种是以块状分布在原奥氏体晶界处;在300℃的分配温度下进行较长时间保温能取得较好的强塑积,随着分配时间的延长,试验Q&P钢的残余奥氏体含量及残余奥氏体中的碳含量均不断增加,分配时间为1 200 s时所得试验钢的强塑积最高,可达37 300 MPa·%以上.
The heat treatment process of Si-Mn Q&P(quenching and partitioning) steel was experimentally investigated using salt bath furnace. Effects of partitioning time on mechanical properties, microstructure, retained austenite content of the tested steel after heat treatment and carbon content in retained austenite had been studied. It is shown that the microstructure of the tested steel was lath martensite and retained austenite. It was found that retained austenite with thin film type of inter-lath or blocky type was distributed in different positions respectively. Blocky type retained austenite was found along austenitic grain boundaries and the thin film distributed between martensite laths. The retained austenite content and carbon content in retained austenite of the tested steel increased partitioning temperature of 300 ℃ and the partitioning time of 1 200 s.
参考文献
| [1] | Speer JG;Edmonds DV;Rizzo FC;Matlock DK .Partitioning of carbon from supersaturated plates of ferrite, with application to steel processing and fundamentals of the bainite transformation[J].Current opinion in solid state & materials science,2004(3/4):219-237. |
| [2] | David K. Matlock;Volker E. Brautigam;John G. Speer .Application of the Quenching and Partitioning (Q&P) Process to a Medium-Carbon, High-Si Microalloyed Bar Steel[J].Materials Science Forum,2003(Pt.2):1089-1094. |
| [3] | J. Speer;D. K. Matlock;B. C. De Cooman;J. G. Schroth .Carbon partitioning into austenite after martensite transformation[J].Acta materialia,2003(9):2611-2622. |
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