含镍低温压力容器钢的静态CCT曲线研究  

Study on Static CCT Curve of Ni-containing Low Temperature Pressure Vessel Steel

作　　者：熊涛[1] 徐光[1] 袁清[1] 熊志强 胡海江[1] XIONG Tao;XU Guang;YUAN Qing;XIONG Zhiqiang;HU Haijiang(State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学耐火材料与冶金国家重点实验室,湖北武汉430081

出　　处：《热加工工艺》2022年第4期42-45,共4页Hot Working Technology

基　　金：湖北省技术创新重大项目(2017AAA116);国家自然科学基金项目(51274154);国家自然科学基金青年基金项目(51274154);河北省钢铁联合研究基金项目(E2018318013)。

摘　　要：使用Formaster-FП相变仪测定了一种5%Ni低温压力容器钢在不同冷却速度条件下的膨胀量随温度的变化曲线,测得临界相变点为A_(c1)=640℃,A_(c3)=753℃。结合膨胀量曲线和金相组织,利用Origin软件绘制了该钢种的过冷奥氏体连续冷却转变曲线。结果表明,在奥氏体连续冷却转变过程中,冷速速率为0.2℃/s时,扩散型的多边形铁素体相变明显被促进。随着冷速的增大,多边形铁素体相变减少,临界相变温度降低,贝氏体相变量增加。当冷速继续增大达到5℃/s时,高温奥氏体快速通过高温相变区,在低温区转变成马氏体。Formaster-FFП phase transformation instrument was used to determine the change curve of the dilation of 5%Ni low temperature pressure vessel steel with temperature at different cooling rates.The critical transformation points were measured to be A_(c1)=640℃ and A_(c3)=753℃.The continuous cooling transformation(CCT)curve of undercooling austenite of the tested steel was plotted by using Origin software.The results show that during the continuous cooling transformation of austenite,the phase transformation of diffused polygonal ferrite is promoted by a small cooling rate of 0.2℃/s.With the increase of cooling rate,the phase transformation of polygonal ferrite and the critical phase transformation temperature decrease,while the transformation amount of bainitie increases.With the increase of cooling rate(reaching 5℃/s),the high-temperature austenite rapidly passes through high temperature phase change region,which transforms into martensite at low temperature region.

关 键 词：镍 低温压力容器钢 CCT曲线 热膨胀法 组织 

分 类 号：TG142.1[一般工业技术—材料科学与工程]