热处理对11Cr3W3Co铁素体/马氏体钢组织和力学性能的影响  

Effects of Heat Treatment on Microstructure and Mechanical Properties of 11Cr3W3Co Ferrite/Martensite Steel

作　　者：鲁家瑞 沈寅忠[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《热加工工艺》2016年第20期169-172,共4页Hot Working Technology

基　　金：国家自然科学基金项目(51034011);国家科技重大专项项目(2011ZX06004-009);国家磁约束核聚变能研究专项项目(2011GB113001)

摘　　要：使用不同的热处理工艺参数研究了11Cr3W3Co铁素体/奥氏体钢组织和力学性能的变化规律。结果表明,钢的强度随回火温度的升高而降低,并在550℃回火后的钢出现了明显的二次硬化。回火温度超过550℃后,强度快速下降。11Cr3W3Co钢经过不同热处理后均发现有大量的δ铁素体。高温回火后,δ铁素体的边界形成80~100 nm宽的M23C6碳化物析出带。同时,二次硬化是由于大量细小W2C碳化物的析出造成的。随回火温度升高,晶粒内部出现位错胞,位错密度下降,从而使钢的强度降低。The change rules of microstructure and mechanical properties of 11Cr3W3Co ferritic/martensitic steel were investigated by using different heat treatment process parameters. The results show that the strength of the steel decreases with the increase of the tempering temperature, and a significant secondary hardening appeares in the steel tempered at 550 ℃. After the tempering temperature exceeds 550 ℃, the strength decreases rapidly. A lot of δ-ferfite is found in the 11Cr3W3Co steels after different heat treatment, and M23C6 carbides precipitation zone with width of 80-100 nm is formed in the δ-ferrite boundaries after high temperature tempering. At the same time, the secondary hardening is caused by the precipitation of a large number of fine W2C carbides. With the increase of tempering temperature, the dislocation cell in the grain interior appears,and the dislocation density decreases, which reduces the strength of the steel.

关 键 词：11Cr3W3Co 钢 回火温度 二次硬化 

分 类 号：TG156.5[金属学及工艺—热处理]