热轧对304不锈钢/Q235碳钢复合板界面组织的影响  

Effect of hot rolling on interface microstructure of 304 stainless steel/Q235 carbon steel composite plate

作　　者：黄郦 张明亚 李景辉 徐高山 敬和民[1] HUANG Li;ZHANG Ming-ya;LI Jing-hui;XU Gao-shan;JING He-min(School of Materials Science and Engineering,Anhui University of Technology,Ma’anshan 243002,China;School of Metallurgical Engineering,Anhui University of Technology,Ma’anshan 243002,China)

机构地区：[1]安徽工业大学材料科学与工程学院,安徽马鞍山243002 [2]安徽工业大学冶金工程学院,安徽马鞍山243002

出　　处：《材料热处理学报》2022年第12期100-106,共7页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51805002);先进金属材料绿色制备与表面技术教育部重点试验室项目(51805002和GFST2020KF03);江苏省、安徽省博士后基金(2019K208和2019B343)。

摘　　要：采用光学显微镜(OM)、扫描电镜(SEM)、X射线衍射(XRD)和电子背散射衍射(EBSD)技术等研究了热轧对304不锈钢/Q235碳钢复合板界面微观组织演变的影响。结果表明:304层与Q235层之间形成了良好的冶金结合;复合板的界面两侧组织由304层的奥氏体、Q235层的铁素体+珠光体组成;碳钢基体中存在脱碳层,其厚度大约为140μm,组织为铁素体;复合板界面存在Fe、Cr、Ni、Mn等元素的扩散区,且各元素含量有明显的梯度分布;相较于退火态复合板,热轧复合板的晶粒明显细化;在二次热轧过程中,304层和Q235层中均发生了一定程度的动态再结晶。Effect of hot rolling on interface microstructure evolution of 304 stainless steel/Q235 carbon steel composite plate was studied by means of optical microscope(OM), scanning electron microscopy(SEM), X-ray diffraction(XRD) and electron backscatter diffraction(EBSD) technique. The results show that a good metallurgical bonding is formed between 304 layer and Q235 layer;the microstructure on both sides of the interface of the composite plate is composed of 304 layers of austenite and Q235 layers of ferrite + pearlite. Decarburization layer exists in the carbon steel matrix, and its thickness is about 140 μm, the microstructure is ferrite. There are diffusion zones of Fe, Cr, Ni, Mn and other elements at the interface of the composite plate, and the content of each element has an obvious gradient distribution. Compared with the annealed composite plate, the grain size of the hot rolled composite plate is obviously refined. During the secondary hot rolling process, dynamic recrystallization occurs in the 304 layer and Q235 layer to a certain extent.

关 键 词：热轧 界面元素扩散 晶粒细化 再结晶 

分 类 号：TG335.11[金属学及工艺—金属压力加工]