摘要
采用真空热轧法对20 mm厚的碳钢、4 mm厚的304奥氏体不锈钢和4 mm厚的410马氏体不锈钢3层复合板进行轧制复合。研究结果表明,在高温高压下,界面实现了牢固的冶金结合,板材复合良好,无开裂和氧化层出现。在碳钢/不锈钢复合界面近碳钢侧出现一层60~80μm的脱碳层,由于C、Cr的跨界面扩散使界面出现一层白亮的条带层,为Cr的碳化物的硬脆相,且C元素出现"上坡扩散";在双层不锈钢的复合界面附近发现少量弥散分布的细小Si-Mn氧化物颗粒,扩散层厚度约3μm。复合板材抗拉强度平均值为568.32 MPa,拉伸断口分层明显,碳钢侧韧窝大且深,塑性较好,复合层为Cr的碳化物,呈现脆性断裂。410不锈钢呈现准解理断裂,而304不锈钢由于处于板材边缘,呈现切断型断口形貌。并且由于板材变形协调性的差异,裂纹在复合层处萌生,并首先向410不锈钢侧扩展。
Roll bonding of the three-layer clad plate,including carbon steel(20 mm thick),304 austenitic stainless steel(4 mm thick)and 410 martensitic stainless steel(4 mm thick)was carried out by vacuum hot rolling method.The research results show that firm metallurgical bond of the interfaces is achieved,and the plate is bonded well without cracking and oxidation layer under the high temperature and high pressure.A decarburization layer of 60-80μm appeares near the carbon steel side of the composite interface of carbon steel/stainless steel.A white and bright band layer appeares on the interface due to the interfacial diffusion of Cr and C,which is the hard and brittle phase of Cr carbide,and the’uphill diffusion’of C element appears.A small number of fine and dispersed Si-Mn oxide particles are found near the composite interface of the two stainless steels,and the thickness of the diffusion layer is about 3μm.The average tensile strength of the clad plate is 568.32 MPa,and the tensile fracture stratification is obvious.The dimple of carbon steel side is large and deep with good plasticity,the composite layer is Cr carbide with brittle fracture.The 410 stainless steel shows quasi-cleavage fracture,while the 304 stainless steel shows cut-off fracture morphology for it is located at the edge of the plate.In addition,due to the difference in plate deformation coordination,the crack initiation occurs at the composite layer and extends to the 410 stainless steel side firstly.
作者
吕泽华
AGAMURADOV Dayanch
张志雄
赵敬伟
林鹏
王涛
LV Ze-hua;AGAMURADOV Dayanch;ZHANG Zhi-xiong;ZHAO Jing-wei;LIN Peng;WANG Tao(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment,Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China;TYUT-UOW Joint Research Centre,Taiyuan University of Technology,Taiyuan 030024,China;College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2020年第7期168-175,共8页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(51901151,U1710254,51975398,51974196,51905372)
山西省科技重大专项项目(20181102015)。
关键词
真空热轧法
复合板
界面
微观组织
力学性能
vacuum hot rolling method
clad plate
interfaces
microstructure
mechanical properties
