CAJ | 학술논문

研究304奥氏体不锈钢/Q345R热轧复合板在复合界面的组织及其元素扩散情况, 分析测试复合界面的抗剪切强度. 检测结果表明复合界面较纯净, 仅有少量弥散分布的细小颗粒状Si-Mn氧化物. 检测还发现在复合界面附近的元素发生了明显的扩散: 碳钢侧C元素向不锈钢侧的扩散导致该侧在复合界面处发生了一定程度上的脱碳, 形成一条宽度约为100μm的铁素体带; 而不锈钢侧Cr、 Ni等元素也向碳钢侧扩散, 其扩散距离分别约为30μm、 15μm. 碳钢侧C元素向不锈钢侧的扩散导致不锈钢奥氏体晶界形成富铬的碳化物, 且在不锈钢侧Cr元素扩散的共同作用下致使不锈钢晶界周围的基体形成了贫铬区, 晶间腐蚀倾向增大. 检测结果表明, 复合界面的抗剪切强度达到450 MPa以上, 且基板Q345R力学性能也完全满足国标要求.
연구304오씨체불수강/Q345R열알복합판재복합계면적조직급기원소확산정황, 분석측시복합계면적항전절강도. 검측결과표명복합계면교순정, 부유소량미산분포적세소과립상Si-Mn양화물. 검측환발현재복합계면부근적원소발생료명현적확산: 탄강측C원소향불수강측적확산도치해측재복합계면처발생료일정정도상적탈탄, 형성일조관도약위100μm적철소체대; 이불수강측Cr、 Ni등원소야향탄강측확산, 기확산거리분별약위30μm、 15μm. 탄강측C원소향불수강측적확산도치불수강오씨체정계형성부락적탄화물, 차재불수강측Cr원소확산적공동작용하치사불수강정계주위적기체형성료빈락구, 정간부식경향증대. 검측결과표명, 복합계면적항전절강도체도450 MPa이상, 차기판Q345R역학성능야완전만족국표요구.
The paper studies the microstructure and elements diffusion in the binding interface between 304 austenitic stainless steel/ Q345R hot-rolled clad plates and tests the shear length of the binding interface. Some tests have been performed and reveal the interface is clean except for dispersed Si-Mn oxide particles in small amount and the elements adjacent to the interface diffuse significantly:the diffusion of C element from carbon side to stainless side results in a certain degree of decarburization of the interface in the carbon side and forms a ferrite band about 100μm wide;the diffusion of Cr, Ni and other elements goes 30μm and 15μm respectively from the stainless side to carbon side. The C element that diffused to the stainless steel side forms chromium-rich carbide on the austenite grain boundaries and causes the formation of chromium depleted region on the substrate around the stainless steel grains in conjunction with the diffusion of Cr element from the stailness steel side, which increases intergranular corrosion tendency. The shear strength of the binding interface is above 450 MPa and the mechanical properties of carbon steel Q345R are in compliance with applicable national stardards.