回火温度对高碳钢断裂韧性的影响  

Effect of tempering temperature on fracture toughness of high carbon steel

作　　者：王冬晨[1] 李晓源[1] 韦丽金 时捷[1] 王奇[1] 徐乐[1] 

机构地区：[1]钢铁研究总院特殊钢研究所,北京100081 [2]晋西工业集团有限责任公司,山西太原030027

出　　处：《钢铁研究学报》2017年第6期494-499,共6页Journal of Iron and Steel Research

基　　金：国家自然科学基金青年基金资助项目(51301042)

摘　　要：研究了回火温度对高碳钢断裂韧性及其他力学性能的影响。利用紧凑拉伸试样测量其平面应变断裂韧度,扫描电镜(SEM)观察回火后的组织演变规律及断裂韧度试样断口形貌。结果表明:随着回火温度的升高,马氏体逐渐分解消失,从过饱和α固溶体中析出的碳化物数量逐渐增多并发生聚集长大,强度和硬度下降,塑性、断裂韧性和冲击韧性上升。位错强化和固溶强化作用减弱是试验钢强度降低、韧性升高的主要原因。The effect of tempering temperatures on fracture toughness and other mechanical properties of high carbon steel was investigated. Plane strain fracture toughness was tested with compact tension specimen. Microstructure and fracture morphology of KIC samples after tempering treatment were examined by scanning electron microscope （SEM）. The results show that the as-quenched martensite phase gradually disappears, carbides coarsen and the amount of precipitated carbide increases with the tempering temperature. The strength and hardness of the steel decreases with the increase of tempering temperature while the ductility and toughness improves. The main reasons for the change of strength and toughness have close relationship with the weakening of solid solution strengthening and dislocation strengthening.

关 键 词：回火温度 高碳钢 强度 断裂韧性 碳化物 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG161[金属学及工艺—金属材料]