工程科学学报，第40卷，第4期：469-477,2018年4月 Chinese Journal of Engineering,Vol.40,No.4:469-477,April 2018 DOI:10.13374/j.issn2095-9389.2018.04.010:http://journals.ustb.edu.cn 热压316L/Q345R复合板的结合性能 秦 勤巴，邓俊超，臧勇，谢璐，朱学挥 北京科技大学机械工程学院，北京100083 ☒通信作者，E-mail:qinqin(@me.ustb.cdu.cn 摘要热轧双金属复合板由于其优良性质而得到广泛使用，而如何改善其结合性能也成为业界内的研究热点问题.本文尝 试采用分子动力学模拟的方法对316L/Q345R双金属板的高温结合性能进行系统研究.在建立316L/Q345R体系的原子结构 模型的基础上，使用MD模拟方法对316L/Q345R体系的热压复合过程进行模拟，其中采用嵌入原子势函数来描述Fe、Cr和 之间的相互作用.分析了不同温度与压缩应变率对热压复合变形机制以及扩散层厚度的影响，并探讨了添加金属层对界 面结合性能的改善效果.研究表明：温度的提高有利于形成较厚的扩散层，当双金属热压复合温度接近熔点时，此时在双金属 复合界面获得的扩散层厚度远大于在较低温度复合时的扩散层厚度：应变率的提高会降低扩散层厚度，这主要因为在达到相 同的压缩应变时，随着应变率增大和压缩时间缩短，原子的扩散时间缩短：在双金属之间添加一个晶格厚度的N层后，复合界 面扩散层厚度比不含N复合时增加了134.5%，表明添加镍层能够明显提高扩散层厚度，但添加铬层对提高扩散层厚度的影 响不大。 关键词复合板：界面：结合性能：分子动力学：热压复合 分类号TG335.59 Factors influencing the combined performance of hot-rolled bimetallic composite plates prepared via hot compression QIN Qin,DENG Jun-ehao,ZANG Yong,XIE Lu,ZHU Xue-hui School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:qinqin@me.ustb.edu.cn ABSTRACT Hot-rolled bimetallic composite plates are widely used because of their excellent properties.In the recent years,the en- hancement of the combined performance of hot-rolled bimetallic composite plates has gained the attention of the industry.The molecular dynamics simulations were employed to assess the high-temperature combined performance of 3161/0345R bimetallic plate systemati- cally.The hot-compression process of the 316L/0345R system was simulated on its atom structure model.The potential functions of the embedded-atom method were employed to describe the interaction between Fe,Cr,and Ni.The effects of temperature and compres- sive strain rate on the mechanism of the hot-compression deformation and the thickness of the diffusion layer were analyzed.The influ- ence of adding a metal layer on the interface bonding performance was also discussed.The results show that increasing the temperature up to the composite melting point leads to the formation of a thicker diffusion layer at the bimetallic interface.However,an increase in the strain rate reduces the thickness of the diffusion layer,because the diffusion and compression time of the atoms shortens as the strain rate increases.The influence of the addition of a Ni or a Cr layer on the combined performance was investigated.The thickness of the diffusion layer of the bimetallic interface was increased by 134.5%when a lattice thickness Ni layer was added in the bimetallic interface:however,the addition of a Cr layer did not improve the combined performance.This study provides new insight into the fac- tors that directly influence the performance of hot-rolled bimetallic composite plates. 收稿日期：201801-18 基金项目：国家自然科学基金资助项目(51375041)工程科学学报，第 40 卷，第 4 期: 469--477，2018 年 4 月 Chinese Journal of Engineering，Vol． 40，No． 4: 469--477，April 2018 DOI: 10． 13374 /j． issn2095--9389． 2018． 04． 010; http: / /journals． ustb． edu． cn 热压 316L /Q345Ｒ 复合板的结合性能 秦 勤，邓俊超，臧 勇，谢 璐，朱学辉 北京科技大学机械工程学院，北京 100083 通信作者，E-mail: qinqin@ me． ustb． edu． cn 摘 要 热轧双金属复合板由于其优良性质而得到广泛使用，而如何改善其结合性能也成为业界内的研究热点问题． 本文尝 试采用分子动力学模拟的方法对 316L/Q345Ｒ 双金属板的高温结合性能进行系统研究． 在建立 316L/Q345Ｒ 体系的原子结构 模型的基础上，使用 MD 模拟方法对 316L/Q345Ｒ 体系的热压复合过程进行模拟，其中采用嵌入原子势函数来描述 Fe、Cr 和 Ni 之间的相互作用． 分析了不同温度与压缩应变率对热压复合变形机制以及扩散层厚度的影响，并探讨了添加金属层对界 面结合性能的改善效果． 研究表明: 温度的提高有利于形成较厚的扩散层，当双金属热压复合温度接近熔点时，此时在双金属 复合界面获得的扩散层厚度远大于在较低温度复合时的扩散层厚度; 应变率的提高会降低扩散层厚度，这主要因为在达到相 同的压缩应变时，随着应变率增大和压缩时间缩短，原子的扩散时间缩短; 在双金属之间添加一个晶格厚度的 Ni 层后，复合界 面扩散层厚度比不含 Ni 复合时增加了 134. 5% ，表明添加镍层能够明显提高扩散层厚度，但添加铬层对提高扩散层厚度的影 响不大． 关键词 复合板; 界面; 结合性能; 分子动力学; 热压复合 分类号 TG335. 5 + 9 收稿日期: 2018--01--18 基金项目: 国家自然科学基金资助项目( 51375041) Factors influencing the combined performance of hot-rolled bimetallic composite plates prepared via hot compression QIN Qin ，DENG Jun-chao，ZANG Yong，XIE Lu，ZHU Xue-hui School of Mechanical Engineering，University of Science and Technology Beijing，Beijing 100083，China Corresponding author，E-mail: qinqin@ me． ustb． edu． cn ABSTＲACT Hot-rolled bimetallic composite plates are widely used because of their excellent properties． In the recent years，the en￾hancement of the combined performance of hot-rolled bimetallic composite plates has gained the attention of the industry． The molecular dynamics simulations were employed to assess the high-temperature combined performance of 316L/Q345Ｒ bimetallic plate systemati￾cally． The hot-compression process of the 316L/Q345Ｒ system was simulated on its atom structure model． The potential functions of the embedded-atom method were employed to describe the interaction between Fe，Cr，and Ni． The effects of temperature and compres￾sive strain rate on the mechanism of the hot-compression deformation and the thickness of the diffusion layer were analyzed． The influ￾ence of adding a metal layer on the interface bonding performance was also discussed． The results show that increasing the temperature up to the composite melting point leads to the formation of a thicker diffusion layer at the bimetallic interface． However，an increase in the strain rate reduces the thickness of the diffusion layer，because the diffusion and compression time of the atoms shortens as the strain rate increases． The influence of the addition of a Ni or a Cr layer on the combined performance was investigated． The thickness of the diffusion layer of the bimetallic interface was increased by 134. 5% when a lattice thickness Ni layer was added in the bimetallic interface; however，the addition of a Cr layer did not improve the combined performance． This study provides new insight into the fac￾tors that directly influence the performance of hot-rolled bimetallic composite plates．