北极海洋平台用Q355E热轧H型钢连续冷却转变规律
发布时间：2019-05-31 16:53
【摘要】：在实验室利用Gleeble-3500热模拟试验机对3种Nb、V微合金化Q355E热轧H型钢进行了连续冷却转变规律测试,研究了冷却速度对试验钢组织与硬度的影响。结果表明:在冷速为0.5℃/s时,组织中开始出现贝氏体;冷速大于7℃/s时,珠光体转变即终止。在中等冷速下,Nb的加入促进了贝氏体的形成,抑制了铁素体与珠光体的形核;并且Nb的加入使铁素体转变区右移。Cr的加入降低了较高冷速下铁素体与珠光体相变点,并促进了高冷速下马氏体的形成。由于受V析出的影响,含V试验钢在冷速为1℃/s时其硬度曲线有一个"波谷"。3种试验钢的冷速在0.5~3℃/s之间时,试验钢可获得强韧性较好的细小准多边形铁素体、少量珠光体与贝氏体的复合组织。
[Abstract]:The continuous cooling transformation of three kinds of Nb, V microalloyed Q355E hot rolled H-beam was tested by Gleeble-3500 thermal simulation tester, and the effect of cooling rate on the microstructure and hardness of the test steel was studied. The results show that bainite begins to appear in the microstructure when the cooling rate is 0.5 鈩，
本文编号：2489861
[Abstract]:The continuous cooling transformation of three kinds of Nb, V microalloyed Q355E hot rolled H-beam was tested by Gleeble-3500 thermal simulation tester, and the effect of cooling rate on the microstructure and hardness of the test steel was studied. The results show that bainite begins to appear in the microstructure when the cooling rate is 0.5 鈩，
本文编号：2489861
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