CAJ | 학술논문

含钒TRIP钢热变形后在350～450℃等温处理30min,研究卷取温度对其显微组织和力学性能的影响.结果表明,随等温温度的升高,贝氏体、残余奥氏体的量以及残余奥氏体中碳浓度先增加后减少.断后伸长率、最大力非比例伸长率和应变硬化指数表现出与此类似的变化趋势.450℃等温处理时析出的渗碳体对延性和应变硬化指数有不利影响.热轧TRIP钢的卷取温度为400℃时将获得优良的综合力学性能.
함범TRIP강열변형후재350～450℃등온처리30min,연구권취온도대기현미조직화역학성능적영향.결과표명,수등온온도적승고,패씨체、잔여오씨체적량이급잔여오씨체중탄농도선증가후감소.단후신장솔、최대력비비례신장솔화응변경화지수표현출여차유사적변화추세.450℃등온처리시석출적삼탄체대연성화응변경화지수유불리영향.열알TRIP강적권취온도위400℃시장획득우량적종합역학성능.
Hot deformed vanadium bearing TRIP-aided steels were isothermally treated at 350～450 ℃ for 30 min in order to study the effects of coiling temperature on its microstructure and mechanical properties.The results show that,with the increase of holding temperature,the amount of bainite and retained austenite,the carbon concentration in retained austenite first increases and then decreases.Percentage elongation after fracture,percentage non-proportional elongation at maximun fore and strain hardening exponent exhibit a similar trend as above.Cementite which precipitates during isothermal treatment at 450 ℃ causes damages to both ductility and strain hardening exponent.The excellent combination of strength and ductility is obtained when hot rolling TRIP-aided steels are coiled at 400 ℃.