摘要
针对316L不锈钢/Q370qE碳钢在热轧复合过程存在各层组织不协调、界面结构不易控制的问题,研究终轧温度对不锈钢复合板组织和性能的影响规律。通过金相显微镜、SEM、TEM和EDS分析复合板的显微组织,采用拉剪、拉伸实验测试力学性能。结果表明:终轧温度越高,复合板界面区的脱碳层和渗碳层厚度越大,而Cr、Ni元素扩散距离先增加后减少。840℃终轧时,碳钢层由先共析铁素体、贝氏体和索氏体组成,不锈钢层由部分再结晶的奥氏体组成,脱碳层厚度40μm,渗碳层厚度35μm。随着终轧温度的升高,复合板界面的拉剪强度先增加后降低,而屈服强度和抗拉强度均增加,在高温时增速减缓。复合板的拉剪断裂位置位于碳钢的脱碳层,拉伸断口产生分层现象。因此,840℃终轧复合板的综合力学性能最佳,界面拉剪强度、屈服强度和抗拉强度分别为339、497 MPa和594 MPa,断后伸长率为18.6%。
This paper focuses on the problems of uncoordinated microstructure in each layer and difficult control of interfacial microstructure during the hot roll-bonding process of 316L stainless steel and Q370qE carbon steel.The influence of the final rolling temperature on the microstructure and properties of the stainless steel clad plate is investigated.The microstructure of the clad plate is analyzed by metallographic microscope,scanning electron microscope,transmission electron microscope,and energy dispersive spectrometer.The mechanical properties are performed based on the interface tension-shear and tensile tests.The results show that the higher the final rolling temperature,the larger the thickness of the decarburization layer and carburization layer in the interface area of the clad plate,while the diffusion distance of Cr and Ni elements first increases and then decreases.When the final rolling temperature is 840℃,the carbon steel layer is composed of proeutectoid ferrite,bainite,and sorbite,and the stainless steel layer is composed of austenite with several fine recrystallized grains.The thickness of the decarburization layer is 40μm,and the thickness of the carburization layer is 35μm.With the increase of the final rolling temperature,the interface tension-shear strength of the clad plate first increases and then decreases,while the yield strength and tensile strength both increase,and the increase rate slows down at high temperatures.The tension-shear fracture position of the clad plate is located in the decarburization layer of the carbon steel,and the fracture morphology of tensile shows interface delamination.Therefore,the clad plate final rolled at 840℃achieves the best mechanical performance,with the interface tensionshear strength of 339 MPa,the yield strength of 497 MPa,the tensile strength of 594 MPa,and the elongation after fracture of 18.6%,respectively.
作者
李小兵
金一澜
蒋国民
郑传波
镇凡
邵春娟
曲锦波
麻晗
LI Xiaobing;JIN Yilan;JIANG Guomin;ZHENG Chuanbo;ZHEN Fan;SHAO Chunjuan;QU Jinbo;MA Han(School of Metallurgical Engineering,Jiangsu University of Science and Technology,Zhangjiagang 215600,Jiangsu,China;Institute of Research of Iron&Steel,Shagang,Jiangsu Province,Zhangjiagang 215625,Jiangsu,China)
出处
《材料工程》
北大核心
2026年第3期181-190,共10页
Journal of Materials Engineering
基金
江苏省自然科学基金项目(BK20210889)
江苏省研究生实践创新计划项目(SJYC24_2615)
张家港市科技计划项目(ZKYY2412)。
关键词
不锈钢复合板
终轧温度
界面
扩散
力学性能
stainless steel clad plate
final rolling temperature
interface
diffusion
mechanical property
