两步贝氏体转变对中碳微纳结构钢韧性的影响
万响亮1,胡锋1,2,3(),成林2,3,黄刚2,3,张国宏2,3,吴开明1,2,3
Influence of Two-Step Bainite Transformation on Toughness in Medium-Carbon Micro/Nano-Structured Steel
WAN Xiangliang1,HU Feng1,2,3(),CHENG Lin2,3,HUANG Gang2,3,ZHANG Guohong2,3,WU Kaiming1,2,3

图7. 中碳钢一步和两步贝氏体转变示意图

Fig.7. Schematics of medium-carbon steel for one-step (a) and two-step (b) bainitic transformations (Ac3—temperature of ferrite completely transformed into austenite during heating, Bs—starting transformation temperature of bainite, Ms—starting transformation temperature of martensite, AT—austenitizing temperature, BT—bainitic transformation temperature, WQ—water quenching, γ0—austenite microstructure in austenitizing process, γ1—austenite microstructure in one-step bainitic transformation process, γ2—austenite microstructure in two-step bainitic transformation process,B1—bainite microstructure in one-step bainitic transformation process, B2—bainite microstructure in two-step bainitic transformation process, M2—martensite microstructure in water quenching process for one-step bainitic transformation, M3—martensite microstructure in water quenching process for two-step bainitic transformation, Ci —carbon content of alloying element i, Cγ0—carbon content of austenite microstructure in austenitizing process, Cγ1—carbon content of austenite microstructure in one-step bainitic transformation process, Cγ2—carbon content of austenite microstructure in two-step bainitic transformation process)