论文部分内容阅读
利用SEM,TEM,XRD,相变实验和拉伸实验等方法,分析测试了3种热处理工艺下热镀锌TRIP钢的微观组织、相变产物和力学性能,并运用碳扩散平衡理论分析了不同热处理工艺下实验用钢的马氏体量,研究了马氏体量对力学性能的影响.研究表明:贝氏体等温相变时间影响组织中的马氏体量,当贝氏体转变时间由20 s增加到60 s时,试样中马氏体量由7.08%减少到1.18%;马氏体量对力学性能有显著影响,马氏体量多,马氏体强化效果占主导,使试样拥有类似双相钢的力学性能,同时拥有比双相钢更好的延伸率;随着马氏体量下降,马氏体强化效果逐渐下降,当马氏体量减少到1.18%.实验用钢逐渐呈现出典型的TRIP钢的力学特性.
The microstructure, phase transformation products and mechanical properties of hot-dip galvanized TRIP steels were analyzed and tested by means of SEM, TEM, XRD, phase-change and tensile tests. The carbon diffusion equilibrium theory was used to analyze the microstructure, The effect of martensite content on the mechanical properties of the steel was studied.The results show that the time of isothermal transformation of bainite affects the amount of martensite in the microstructure and the bainite transformation time decreases from When 20 s was increased to 60 s, the amount of martensite in the sample decreased from 7.08% to 1.18%; the amount of martensite had a significant effect on the mechanical properties; the amount of martensite was large and the martensite strengthening effect was dominant. Like with dual-phase steel mechanical properties, but also has better elongation than dual-phase steel; as the amount of martensite decreased martensite strengthening effect gradually decreased, when the amount of martensite reduced to 1.18%. Experimental Steel gradually presents the mechanical properties of a typical TRIP steel.