锻压技术

汽车用310S/GH4169钢镍复合板多道次热轧界面扩散行为

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

作者：秦程夏源谭礼健李军徐小园

单位：1. 重庆工贸职业技术学院智能制造学院 2. 重庆理工大学材料科学与工程学院 3. 重庆长风精密加工有限责任公司

分类号：TG166

出版年,卷(期):页码：2022,47(9):152-157

摘要：

为了提高车用310S/GH4169钢镍复合板的界面性能，采用热轧的方式对其进行加强。采用轧制终止取样方法分析了在轧制阶段钢镍复合板的界面组织变化，测试了靠近界面区的选择性氧化性状态。研究结果表明：GH4169镍基合金与310S不锈钢交界区存在许多链条状形态的组织，其宽度尺寸从3~10 μm快速降低至1~2 μm。在轧制过程中界面处形成了更少的链状氧化物，显著提升了界面的结合性能。提高轧制道次后，310S不锈钢晶粒产生了更大程度的变形，产生了大量的破碎晶粒。Ni、Fe、Cr明显扩散，达到了最长的扩散距离，超过10 μm；而Mo与Mn仅发生了较短距离的扩散；逐渐提高轧制量后，Fe、Cr、Ni扩散到了更深的部位。在轧制界面主要生成Mn氧化物，氧化物会对元素扩散造成限制，造成结合强度减小。

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.

基金项目：

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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