Transactions of Materials and Heat Treatment

Title：Interfacial diffusion behavior on multi-pass hot rolling for automobile 310S/GH4169 steel-nickel composite plate

Authors： Qin Cheng1 Xia Yuan1 Tan Lijian1 Li Jun2 Xu Xiaoyuan3

Unit： 1.College of Intelligent Manufacturing Chongqing Vocational and Technical College of Industry and Trade 2.School of Materials Science and Engineering Chongqing University of Technology 3.Chongqing Changfeng Precision Machining Co. Ltd.

KeyWords： steel-nickel composite plate microstructure hot rolling compound interface diffusion behavior

ClassificationCode：TG166

year,vol(issue):pagenumber：2022,47(9):152-157

Abstract：

In order to improve the interfacial properties of automobile 310S/GH4169 steel-nickel composite plate, the hot rolling method was used to strengthen it. Then, the interface microstructure change of the steel-nickel composite plate in the rolling stage was analyzed by the sampling method at the end of rolling, and the selective oxidation state near the interface area was tested. The research results show that there are many chain-like microstructures in the junction area between GH4169 nickel-base alloy and 310S stainless steel, and the width dimension decreases rapidly from 3-10 μm to 1-2 μm. At the interface during the rolling process, fewer chain oxides are formed, which significantly improve the bonding performance of the interface. After increasing the rolling passes, the 310S stainless steel grains are deformed to a greater extent, resulting in a large number of broken grains. Ni, Fe and Cr diffuse obviously, reaching the longest diffusion distance, which has exceeded 10 μm. However, Mo and Mn only diffuse in a short distance. After gradually increasing the rolling amount, Fe, Cr and Ni diffuse to deeper position. At the rolling interface, Mn oxides are mainly formed, which limits the diffusion of elements and reduces the bonding strength.

Funds：

国家自然科学基金资助项目（51775157）

秦程（1988-），男，学士，讲师 E-mail：qincheng705@126.com

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