中碳Cr-Ni-Mo-V高强度钢的高温拉伸行为研究  

Research on High Temperature Tensile Behavior of Medium Carbon Cr-Ni-Mo-V High Strength Steel

作　　者：王小龙 王毛球[2] 孟彬[1] 时捷[2] 徐乐[2] WANG Xiaolong;WANG Maoqiu;MENG Bin;SHI Jie;XU Le(School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650000,China;Institute for Special Steels,Central Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650000 [2]钢铁研究总院特殊钢研究所,北京100081

出　　处：《热加工工艺》2018年第16期97-100,共4页Hot Working Technology

摘　　要：利用MTS880试验机测试了40CrNi3MoV钢和50CrNi5MoV钢在高温下的拉伸性能。结果表明：试验钢的抗拉强度、屈服强度随试验温度的增加而降低,断面收缩率、伸长率随着试验温度的增加而增加。在350℃时,50CrNi5MoV钢与40CrNi3MoV钢的抗拉强度分别为1395、1180MPa;在500℃拉伸时,50CrNi5MoV钢与40CrNi3MoV钢的抗拉强度分别为1185、978MPa。与室温拉伸时的强度相比,350℃拉伸时50CrNi5MoV钢与40CrNi3MoV钢抗拉强度的下降率分别为14%和15%;500℃拉伸时50CrNi5MoV钢与40CrNi3MoV钢抗拉强度的下降率分别为27%和29%。50CrNi5MoV钢不但室温强度高,而且在500℃的高温下抗拉强度仍比40CrNi3MoV钢高200MPa左右,这说明50CrNi5MoV钢更适合在高温下使用。The tensile properties of 40CrNi3MoV and 50CrNi5MoV steels were studied at high temperature by MTS880testing machine.The results show that the tensile strength and yield strength of the experiment steel decrease with the increase of experiment temperature,the reduction of area and elongation increase with the increase of experiment temperature.The tensile strengths of 50CrNi5MoV steel and 40CrNi3MoV steel are 1395 MPa and 1180 MPa at 350℃,respectively.The tensile strengths of 50CrNi5MoV steel and 40CrNi3MoV steel are 1185 MPa and 987 MPa at 500℃,respectively.Comparing with the strength at room temperature,the tensile strength reduction rates of 50CrNi5MoV steel and 40CrNi3MoV steel are14%and 15%at 350℃,respectively.The tensile strength reduction rates of 50CrNi5MoV steel and 40CrNi3MoV steel are27%and 29%at 500℃,respectively.50CrNi5MoV steel has not only high strength at room temperature,but also the tensile strength is still 200 MPa higher than 40CrNi3MoV steel at 500℃,which indicates that 50CrNi5MoV steel is more suitable for using at high temperature.

关 键 词：高强度钢 碳化物 高温拉伸 力学性能 断口形貌 

分 类 号：TG131[一般工业技术—材料科学与工程]