论文部分内容阅读
研究了两相区加热过冷奥氏体的转变动力学和钢的淬透性。结果表明,未溶铁素体可作为过冷奥氏体转变产物的晶核,促进过冷奥氏体的转变,使转变动力学曲线左移。随两相区加热保温时间的延长,碳、铬、锰不断向奥氏体中富集,硅不断向铁索体中富集,未溶铁素体量不断减少,使过冷奥氏体转变动力学曲线右移。随两相区加热温度的降低,过冷奥氏体的淬透性提高。与完全奥氐体化相比,亚温淬火所得两相颗粒状组织降低钢的淬透性,两相针状组织不降低或略提高钢的淬透性。
The transformation kinetics of undercooled austenite and the hardenability of steel were investigated. The results show that the undissolved ferrite can be used as the nucleus of the supercooled austenite transformation product, promote the transformation of the supercooled austenite, and shift the transformation kinetic curve to the left. With the extension of the heating and holding time in the two-phase zone, carbon, chromium and manganese are continuously enriched in the austenite, and the silicon is continuously enriched in the ferrite. The volume of the undissolved ferrite is continuously reduced, and the kinetics of the transformation of the over-cooled austenite Learn curve right. With the two-phase zone heating temperature decreases, the quench hardenability of supercooled austenite increases. Compared with complete austenite, the two-phase granular structure obtained by sub-tempered quenching reduces the hardenability of the steel, and the two-phase needle-like structure does not decrease or slightly increases the hardenability of the steel.