摘要
利用DIL805A型淬火变形膨胀仪对H13钢进行连续冷却转变试验。利用膨胀法结合金相-硬度法绘制H13钢的连续冷却转变（CCT）曲线。研究了冷速对试样组织和硬度的影响。比较分析980、1030℃两种奥氏体化温度所测CCT曲线的异同。结果表明：马氏体转变的临界冷速为1℃/s。随奥氏体化温度降低,Ms点升高,贝氏体转变区域减小,珠光体转变区域增大且向左偏移;随冷却速度增大和奥氏体化温度升高,试验钢硬度增大。
The continual cooling transformation experiment of H13 steel was carried out by DIL805 A quenching deformation dilatometer. The CCT curves of H13 steel were drawn by the combination of dilatometric change referencing microscopic test and hardness measurement, and the effects of cooling rate on the microstructure and hardness were studied.The difference of two CCT curves in the austenite transition temperature of 980 ℃ and 1030 ℃ was compared and analyzed.The results show that martensite transition critical cooling velocity is 1 ℃/s. With the decrease of austenitizing temperature,the Mspoint increases, the bainite transformation region decreases, the pearlite transformation region increases and offsets to the left. With the increase of cooling rate and austenitizing temperature, the hardness of the tested steel increases.
出处
《热加工工艺》
CSCD
北大核心
2018年第2期129-132,共4页
Hot Working Technology
