QP980钢动态CCT曲线的测定  

Determination of Dynamic CCT Curves of QP980 Steel

作　　者：史军 徐耀文 赵刚[1] 周靓 胡俊[2] SHI Jun;XU Yaowen;ZHAO Gang;ZHOU Liang;HU Jun(School of Materials and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;Wuhan Iron and Steel Co.,Ltd.,Wuhan 430080,China)

机构地区：[1]武汉科技大学材冶学院,湖北武汉430081 [2]武汉钢铁有限公司,湖北武汉430080

出　　处：《热加工工艺》2023年第2期120-123,128,共5页Hot Working Technology

基　　金：湖北省技术创新专项重大项目(2017AAA113)。

摘　　要：利用Gleeble-3500热模拟试验机测定QP980钢动态连续冷却条件下过冷奥氏体的热膨胀曲线,采用切线法确定相变温度,结合金相法和硬度法确定相变类型,利用Origin软件绘制QP980钢动态连续冷却转变(CCT)曲线。结果表明:当冷速<1℃/s时,室温转变产物为铁素体、珠光体和贝氏体的混合组织;当冷速为3~10℃/s时,随着冷速的增加,铁素体和珠光体不断减少,而马氏体量不断增加;当冷速>10℃/s时,主要是马氏体组织。试验结果可以为QP980钢生产提供理论依据。The thermal expansion curves of super cooled austenite under the dynamic continuous cooling condition of QP980 steel were measured by Gleeble-3500 thermal simulator. The phase transformation temperature was determined by tangent method, and the transformation type was determined by alloy phase method and hardness method. The dynamic continuous cooling transformation(CCT)curves of QP980 steel was obtained by using Origin software. The results show that when the cooling rate is less than 1 ℃/s, the transformation product at room temperature is a mixed structure of ferrite, pearlite and bainite. When the cooling rate is 3-10 ℃/s, with the increase of cooling rate, the amount of ferrite and pearlite decreases,while the amount of martensite increases. When the cooling rate is more than 10 ℃/s, the main microstructure is martensite.The test results can provide a theoretical basis for the production of QP980 steel.

关 键 词：QP钢 热模拟 动态CCT曲线 膨胀法 

分 类 号：TG151.2[金属学及工艺—热处理] TG156.1[金属学及工艺—金属学]