摘要
利用光学显微镜、SEM、TEM、X衍射仪、拉伸试验机等对20和15Mn3SiMo两种低碳钢的强韧性、显微组织及断口形貌进行测试与分析．实验结果表明：15Mn3SiMo钢正火态与正火＋250℃回火态，均具有M／A＋AR复相组织，但其强韧性差别较大；20钢经双相区亚温淬,X（750—810℃），也获得F＋M＋AR复相组织，但因加热温度不同，强度出现先升后降，塑性则呈与此相反的变化规律．通过研究AR的数量、分布及机械稳定性，探讨了低碳复相组织钢的强韧化机理．
Strength and toughness, microstructure, fracture morphology of steel 20 and 15Mn3 SiMo were investigated using microscope,SEM,TEM,XRD and tension testing machine. The results showed that 15Mn3SiMo had M/A ＋ ARmultiphase microstructures after normalized and normalied ＋ tempered at 250 % ,there were great differences in strength and toughness. Steel 20 also had F ＋ M ＋ ARmultiphase microstructures after subcritical hardening in duplex phase range （750 - 810 ℃ ）, strength and plasticity appeared different change with heating temperature. Based on the research in quantity, distribution and stability of AR, the mechanism of strengthening and toughening of low-carbon multiphase steel were discussed.
出处
《天津理工大学学报》
2006年第1期1-5,共5页
Journal of Tianjin University of Technology
基金
国家自然科学基金(50227401)
关键词
复相组织钢
AR稳定性
强韧性
multiphase steel
retained ausienite stability
strength and toughness
