Effect of Temper Treatment on the Surface Structure and the Compressive Mechanical Properties of a New Cobalt-based Alloy
WEN Junxia1,2,3, YU lei1,2, CAO Rui1,2, CHE Hongyan4, WANG Tiejun4, DONG Hao4, YAN Yingjie1,2
1 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Lanzhou University of Technology, Lanzhou 730050, China 2 School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China 3 School of Mechanical and Electrical Engineering, Liuzhou Vocational & Technical College, Liuzhou 545005, China 4 Advanced Technology & Materials Limited Company, Beijing 100081, China
Abstract: In this paper, the compressive properties and the fracture process of a cobalt-based alloy before and after tempering were analyzed and explained. The compression stress-strain curves before and after tempering were analyzed. The microstructures of the cobalt-based alloy were investigated by using X-ray diffractometer (XRD) and scanning electron microscope (SEM). The fracture process of the compressed samples before and after tempering treatment is very different. The fracture process of the compressed samples without tempering treatment is a typical brittle fracture, exhibiting an angle between fracture surface and compression axis direction of 45°. After tempered treatment, the crack was firstly generated at the surface of the compressed sample. The cracking direction was parallel to the compression direction. At the same time, there was a 45° conical fracture surface formed on the top of the sample, and then the sample fractured under compression. The core-shell structure formed by oxidation during tempering is responsible for the change of the compressive fracture behavior of this cobalt-based alloy. However, the microstructure of the material itself played a dominant role in the whole compression process. After tempering, the content of fcc-Co phase in the Co matrix obviously increased and the sharp angle of Cr23C6 particles disappeared and became smooth, which improved the toughness of the cobalt-base alloy.
温俊霞, 余磊, 曹睿, 车洪艳, 王铁军, 董浩, 闫英杰. 回火处理对一种新型钴基合金表面结构和压缩力学性能的影响[J]. 材料导报, 2021, 35(Z1): 381-385.
WEN Junxia, YU lei, CAO Rui, CHE Hongyan, WANG Tiejun, DONG Hao, YAN Yingjie. Effect of Temper Treatment on the Surface Structure and the Compressive Mechanical Properties of a New Cobalt-based Alloy. Materials Reports, 2021, 35(Z1): 381-385.