热处理工艺对高碳高铬钢组织和性能的影响  

Effect of Heat Treatment on Microstructure and Properties of High Carbon-Chromium Alloy Steel

作　　者：时晓飞[1] 宋延沛[1] 程相振 刘华平 魏雪[1] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471003 [2]洛阳中重发电设备有限责任公司,河南洛阳471039

出　　处：《铸造》2013年第6期537-540,共4页Foundry

基　　金：河南省科技创新杰出人才计划资助项目(094200510019)

摘　　要：研究了不同热处理工艺对RE复合变质高碳高铬合金钢的显微组织和力学性能的影响。研究结果表明:经热处理后组织内残余奥氏体完全分解,转变为粒状珠光体+M7C3型碳化物。高温固溶处理会对共晶碳化物的形态产生影响,随着固溶温度的提高,连续网状的共晶碳化物转变为杆状和块状,使材料的冲击韧性得到提高,球化处理促使基体内大量二次碳化物的析出,大大提高了材料的硬度。适合于高碳高铬合金钢的热处理工艺为1 200℃加热1 h固溶,水冷,然后750℃×5 h球化处理。经此热处理后,与铸态实验钢相比硬度提高了30.8%,达到HRC53.9,冲击韧性提高了25%,达到9.5 J/cm2。The effects of different heat treatment process on the microstructure and mechanical properties of high carbon-chromium alloy steel modified by RE compound modifier were researched. The results show that after heat treatment, the remaining austenitic completely decomposed into granular pearlite＋MvC3 carbides. The solution temperature impacts the formation ofeutectic carbides. With the increasing of solution temperature, the continuous net eutectic carbides turn into rod and bulk shape, the spheroidization treatment promoted a large number of secondary carbides matrix precipitation, the impact toughness and hardness were improved. The proper heat treatment processes for high carbon-chromium alloy steel include heating at 1 200 ~C for l h, solution treatment and water-cooling, then spheroidization at 750 ~C for 5 hour. Compared with the cast alloy steel, the hardness was HRC 53.9, raised by 30.8% and the impact toughness was 9.5 J/cm2, raised by 25%.

关 键 词：高碳高铬合金钢 热处理工艺 组织 冲击韧性 

分 类 号：TG161[金属学及工艺—热处理]