细化无碳化物贝氏体无缝钢管组织的热处理工艺  

Heat treatment process of refining microstructure of carbide-free bainitic steel seamless pipe

作　　者：程巨强[1] Cheng Juqiang(School of Materials Science and Chemical Engineering,Xi'an Technological University,Xi'an Shaanxi 710021,China)

机构地区：[1]西安工业大学材料与化工学院,陕西西安710021

出　　处：《金属热处理》2022年第10期119-123,共5页Heat Treatment of Metals

摘　　要：研究了不同热处理工艺下无碳化物贝氏体无缝钢管的显微组织和力学性能。结果表明,热轧态无碳化物贝氏体无缝钢管的组织粗大,强度较高,韧性很低。热轧+低温回火后韧性的提高幅度不大,仍然较低。热轧+正火+低温回火可以改善无碳化物贝氏体无缝钢管的韧性,但仍存在部分粗大的组织。热轧后先长时间高温回火(690℃×300 min),再正火和低温回火可以细化无碳化物贝氏体无缝钢管的组织,消除组织遗传性,大幅度提高韧性,冲击断裂特征由脆性断裂转变为韧性断裂。Microstructure and mechanical properties of carbide-free bainitic seamless steel tube under different heat treatment processes were studied. The results show that the as-hot rolled carbide-free bainitic steel seamless pipe has coarse structure, high strength and low toughness. After hot rolling and low temperature tempering, the toughness improves a little, which is still low. After hot rolling, normalizing and low temperature tempering, the toughness improves, but there is still some coarse microstructure. After hot rolling and high temperature tempering at 690 ℃ for 300 min, then normalizing and low temperature tempering, the microstructure refines and the inheritance eliminates, which greatly improve the toughness of the carbide-free bainitic steel seamless pipe and cause the impact fracture characteristics to change from brittle fracture to ductile fracture.

关 键 词：无碳化物贝氏体钢 无缝钢管 组织细化 热处理工艺 

分 类 号：TG142.1[一般工业技术—材料科学与工程]