锻压技术

Fe901激光熔覆层界面结合强度及断裂行为

英文标题：Interfacial bonding strength and fracture behavior for Fe901 laser cladding layer

分类号：TG76

出版年,卷(期):页码：2023,48(8):144-150

摘要：

为了研究H13热作模具钢再制造后基材与Fe901熔覆层的界面结合强度，以界面抗剪强度为指标对其进行了定量表征，分析了熔覆层各部分的显微组织，对断口形貌及断裂机制进行了分析，并利用有限元分析方法对界面的各种应力分布规律进行了分析。结果表明：熔覆层与基材形成了良好的冶金结合；最高界面抗剪强度为804.75 MPa，平均抗剪强度为779.73 MPa；通过断口形貌分析，界面的断裂类型为韧窝-准解理断裂的混合断裂形式；有限元分析表明，在剪切过程中界面的边缘存在较大的应力集中。熔覆层与基材具有很高的界面结合强度，在剪切过程中界面边缘由于发生较大的变形而导致应力集中，最先产生裂纹，导致界面破坏，进而发展为整个熔覆层断裂。

To study the interface bonding strength between substrate and Fe901 cladding layer after remanufacturing of H13 hot mold steel,it was quantitatively characterized with the interfacial shear strength as the index, and the microstructure of each part for the cladding layer was analyzed. Then, the fracture morphology and the fracture mechanism were analyzed, and the various stress distribution laws of the interface were analyzed by finite element analysis method. The results show that the cladding layer and the substrate form a good metallurgical bonding, the highest interfacial shear strength is 804.75 MPa, and the average shear strength is 779.73 MPa. Through the fracture morphology analysis, the fracture type of the interface is a mixture fracture form of dimples and quasi-cleavage fracture. Finite element analysis shows that there is a large stress concentration at the edge of the interface during the shearing process. The cladding layer and the substrate have a very high interface bonding strength. During the shear process, the stress concentration occurs at the edge of the interface due to large deformation,and the cracks are first produced to cause the interface destruction, and then develop into the fracture of the entire cladding layer.

基金项目：

2022年度无锡市“太湖之光”科技攻关计划（产业化关键技术攻关）项目（WX0304B010301220019PD）

作者简介：陈炜（1965-），男，博士，教授，博士生导师,E-mail：chen_wei@ujs.edu.cn

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