摘要
采用热膨胀实验测定实验钢不同奥氏体化温度下的CCT曲线,针对CCT曲线图中铁素体和贝氏体相变区域的变化,通过光学显微镜和扫描电镜观察研究奥氏体化温度对试样室温下显微组织的影响。结果表明:奥氏体化温度越低,晶粒越细小;随奥氏体化温度的降低,铁素体和贝氏体相变受激发形核作用的影响其相变区间逐步扩大并左移;珠光体相变和马氏体相变驱动力只受合金元素在初始奥氏体内富集程度的影响,其开始转变点温度随奥氏体化温度的降低而降低。
The continuous cooling transformation （CCT） curves of experimental steel were determined by thermal expansion tests at three different anstenitizing temperatures. In view of the changes of the ferrite and bainite phase transition region, the effects of austenitizing temperature on the microstructure of samples at room-temperature were studied by OM and SEM.＇ The results show that the lower the austenitizing temperature, the finer the grain. With the austenitizing temperature decreasing, the ferrite and bainite transformation were affected by excitation nucleation, which resulted that the phase transition range is gradually expanded and the curves were shifted to the left. The driving force of the pearlite and martensite transformation is only affected by the enrichment of the alloying elements in the initial austenite. The pearlite and martensite starting points are gradually decreasing with the anstenitizing temperature decreasing.
出处
《热加工工艺》
CSCD
北大核心
2012年第12期151-155,共5页
Hot Working Technology
关键词
TRIP钢
CCT图
微观组织
激发形核
相变
TRIP steel
CCT diagram
microstructure
excitation nucleation
phase transition
