无碳化物贝氏体/马氏体复相高强度钢的组织与性能  

MICROSTRUCTURE AND PROPERTIES OF A CARBIDE-FREE BAINITE/MARTENSITE ULTRA-HIGH STRENGTH STEEL

作　　者：杨福宝[1] 白秉哲[1] 刘东雨[2] 常开地[3] 韦东远[1] 方鸿生[1] 

机构地区：[1]清华大学材料科学与工程系,北京100084 [2]华北电力大学动力工程系,北京102206 [3]首钢技术研究院,北京100041

出　　处：《金属学报》2004年第3期296-300,共5页Acta Metallurgica Sinica

基　　金：国家重点基础性研究发展规划项目资助G1998061513

摘　　要：阐述了新型Mn-si-cr系无碳化物贝氏体/马氏体(CFB/M)复相钢的组织与合金设计思想;研究了复相钢在空冷条件下的组织及其精细结构,并系统地总结了实验钢经不同温度回火后的力学性能。实验结果表明,复相高强钢在具有优良的强韧性能的同时,又具有较高的延迟断裂抗力和抗疲劳破坏能力,其强韧性的提高归于其独特的组织结构:贝氏体碳化物被薄膜状残余奥氏体所取代,大大改善了复相钢的回火稳定性和疲劳性能,稳定的残余奥氏体薄膜作为不可逆氢陷阱,并显著提高了钢的抗氢脆能力。The main ideas of component and structure designing for novel high strength and toughness Mn-Si-Cr bainitic steel are presented. Microstructure, delayed fracture mechanism and fatigue property have been analysis based on the excellent mechanical properties. The improvement in strength and toughness can be contributed to distinctive microstructure of duplex steel. The bainitic carbide is replaced by retained austenite film, which exhibits a better mechanical stability, thermal stability and chemical stability. The film also acts as a hydrogen trap, inhibiting crack propagation, and lower the susceptibility to hydrogen embrittlement.

关 键 词：无碳化物贝氏体 复相钢 残余奥氏体 延迟断裂 疲劳性能 

分 类 号：TG142.2[一般工业技术—材料科学与工程] TG111[金属学及工艺—金属材料]