加氢锻件用2.25Cr-1Mo-0.25V钢的冲击韧性  

Research on Impact Toughness of 2.25Cr-1Mo-0.25V Steel for Hydrogenation Forgings

作　　者：马窦琴 宋亚虎[1] 赵学谦 郎庆斌 庞庆海 张广威 MA Douqin;SONG Yahu;ZHAO Xueqian;LANG Qinbin;PANG Qinhai;ZHANG Guangwei(CITIC Heavy Industries Co.,Ltd,Luoyang 471039,China;Henan University of Science and Technology Luoyang,School of Materials Science and Engineering,Luoyang 471023,China)

机构地区：[1]中信重工机械股份有限公司,河南洛阳471039 [2]河南科技大学材料科学与工程学院,河南洛阳471023

出　　处：《材料科学与工程学报》2020年第4期625-628,663,共5页Journal of Materials Science and Engineering

基　　金：洛阳市科技重大专项资助项目(1801016A)。

摘　　要：用夏比冲击实验,测定了2.25Cr-1Mo-0.25V钢在-130℃~20℃下的冲击性能,研究了其低温冲击韧性及韧脆转变温度,并对影响韧脆转变温度的因素进行了探讨。结果表明,该加氢锻件用钢在高于-60℃以上呈韧性断裂,低于-110℃时,呈脆性断裂。采用Bohzmann函数对冲击功和温度的关系进行拟合回归分析,确定其韧脆转变温度为-77.7℃。通过控制化学成分和优化热加工工艺获得晶粒细小均匀的贝氏体组织,可降低2.25Cr-1Mo-0.25V钢的韧脆转变温度,从而提高其低温冲击韧性。Impact properties of 2.25Cr-1Mo-0.25V steel were measured by Charpy impact test in the temperature range from-130℃tO20℃.The impact toughness and ductile-brittle transition temperature at low temperature were studied by impact energy absorption and fracture morphology.The factors affecting the ductile-brittle transition temperature are also discussed.The results show that the 2.25Cr-1Mo-0.25V steel is ductile fracture above-60℃,and is brittle fracture below-110℃.The Bohzmann function was used to analyze the relationship between impact energy and temperature,and the ductile-brittle transition temperature was determined to be-77.7℃.The fine and uniform Bainite structure can be obtained through strictly controlling the chemical composition by advanced smelting technology and optimizing the heat treatment process,which can lower the ductile and brittle transition temperature of 2.25Cr-1Mo-0.25V steel,thus improving its low temperature impact toughness.

关 键 词：2.25CR-1MO-0.25V 加氢锻件 低温冲击 韧脆转变温度 断口形貌 

分 类 号：TG142.7[一般工业技术—材料科学与工程]