Manufacturing of high strength bimetallic section steel with hot-rolling process  

作　　者：Zecheng Zhuang Lei Zeng Weiping Lu Xuehai Qian Zhen Li Jianping Tan Yong Xiang 

机构地区：[1]Light Alloys Research Institute,Central South University,Changsha,410083,China [2]Guangxi Normal University of Science and Technology,Laibin,546199,China [3]State Key Laboratory of Precision Manufacturing for Extreme Service Performance,Central South University,Changsha,410083,China [4]School of Mechanical and Electrical Engineering,Central South University,Changsha,410083,China [5]Changsha WuJiang Intelligent Innovation Technology co.,Lt.d,Changsha,410023,China [6]Technology Centre,Guangxi Liuzhou Iron and Steel Group Lt.d,Liuzhou,545002,China [7]Hunan Provincial Engineering Research Centre for Laminated Metal Composites,Changsha,410083,China

出　　处：《Progress in Natural Science:Materials International》2024年第6期1225-1235,共11页自然科学进展·国际材料(英文版)

基　　金：funded by the key R&D project of Guangxi Zhuang Autonomous Region(NO.2021AB16016);the Project of State Key Laboratory of Precision Manufacturing for Extreme Service Performance,Central South University(Grant No.ZZYJKT2024-10);the science and technology plan project of Liu Zhou City(NO.2021AA0101B001);Guangxi Science and Technology Normal University Key Laboratory project(NO.GXKSKYPT2021008);Guangxi Science and Technology Base and Talent Project(NO.AD23026282);Guangxi Higher Education Undergraduate Teaching Reform Project(NO.2023GKSYGB32)

摘　　要：This study aimed to develop a 316L/35#stainless steel–bimetallic section steel to satisfy plasticity and strength standards.The stainless steel bimetallic section was made of 316L stainless steel,whereas the base metal was made of 35#carbon steel,rolled using 13 rolling mills at 1150°C by applying interface vacuum technology.Moreover,the mechanical properties and microstructure of the composite interface of hot-rolled stainless steel-–bimetallic section steel were analyzed at multiple scales.The finished,rolled-section steel was selected as the research object.Various experiments were conducted from multiple scales:transmission electron microscopy(TEM),electron probe micro-analyses(EPMA),and scanning electron microscopy(SEM)were utilized,among other techniques for testing the mechanical properties.The results revealed that distinct carburized and decarburized zones were formed on both sides of the composite interface due to the diffusion of elements.The width of the carburized zone was 30–50μm,and the hardness was 184.3HV,whereas the width of the decarburized zone was 80–100μm,and the hardness was 146.4HV.In the carburized zone,short,rod-like martensite,second-phase precipitates,and chromium carbide and oxides were observed.The shear strength of the stainless clad section steel was 384.62 MPa and the ultimate strength was 599.76 MPa,far exceeding the 210 MPa required in the standard,which revealed that the bimetal achieved good metallurgical bonding.This study serves as an important theoretical basis for conducting structural integrity evaluations of bimetallic materials.

关 键 词：Bimetallic section steel Multiple scales Metallurgy bonding STRENGTH Composite interface 

分 类 号：TG335.11[金属学及工艺—金属压力加工]