SDP2新型贝氏体模具钢的相变及动力学
发布时间：2018-11-16 15:33
【摘要】：对新开发大截面贝氏体塑料模具钢SDP2在极低冷速下的过冷奥氏体连续冷却转变过程和相变动力学进行了研究。采用DIL805A高精度差分热膨胀仪测量SDP2钢线膨胀行为,利用SEM分析冷却转变产物;根据JMA公式计算SDP2钢贝氏体相变激活能和Avrami指数。结果表明,SDP2钢过冷奥氏体连续冷却过程包含珠光体、贝氏体和马氏体转变,而无铁素体转变;当冷速大于0.02℃/s时,转变产物以下贝氏体或马氏体为主;小于0.02℃/s时,以上贝氏体或粒状贝氏体为主,并出现珠光体。SDP2钢贝氏体转变的激活能为117 k J/mol,SDP2钢在不同冷速下贝氏体转变动力学指数Avrami指数n≈2~3,经分析计算所得的Avrami指数值所对应的显微组织形态和实验所观察到的显微组织相符合。
[Abstract]:The continuous cooling transformation process and transformation kinetics of undercooled austenite at very low cooling rate for the newly developed large-section bainitic plastic die steel SDP2 were studied. The linear expansion behavior of SDP2 steel was measured by DIL805A high precision differential thermal expansion instrument, the cooling transition product was analyzed by SEM, and the activation energy and Avrami exponent of bainite transformation of SDP2 steel were calculated according to JMA formula. The results show that the continuous cooling process of supercooled austenite of SDP2 steel consists of pearlite, bainite and martensite transformation, but no ferrite transformation, and when the cooling rate is greater than 0.02 鈩，
本文编号：2335898
[Abstract]:The continuous cooling transformation process and transformation kinetics of undercooled austenite at very low cooling rate for the newly developed large-section bainitic plastic die steel SDP2 were studied. The linear expansion behavior of SDP2 steel was measured by DIL805A high precision differential thermal expansion instrument, the cooling transition product was analyzed by SEM, and the activation energy and Avrami exponent of bainite transformation of SDP2 steel were calculated according to JMA formula. The results show that the continuous cooling process of supercooled austenite of SDP2 steel consists of pearlite, bainite and martensite transformation, but no ferrite transformation, and when the cooling rate is greater than 0.02 鈩，
本文编号：2335898
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