Effect of Cooling Rate on Microstructure and Hardness of Medium Manganese Martensitic Wear-resistant Steel
DENG Jie1, SUN Xinjun2, ZHANG Tao3, SONG Xinli1, LIANG Xiaokai2, MA Yuxi1, XIANG Zhidong1
1 The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China 2 Institute of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China 3 Iron and Steel Research Institute, Ansteel Group, Anshan 114009, China
Abstract: The wear failure often occurs because of the bad service environment of mining machinery components. The single martensite structure of the components made of low alloy wear resistant steel is obtained by quenching and low temperature tempering. Their hardness is high, but the toughness is poor. At present, the martensite and residual austenite (M and RA) multiphase structure of medium manganese wear-resistant steel can be obtained by effectively controlling the process parameters, so as to ensure that the mining mechanical components have a certain hardness and at the same time ensure a certain degree of plastic toughness. The evolution of microstructure and the volume fraction and morphology of residual austenite and Vickers hardness for medium manganese wear-resistant steel were studied by OM, TEM, EBSD, XRD and Vickers-hardness test. The results showed that only martensite and different volume fraction of residual austenite was obtained with the cooling rate ranging from 30 ℃/s to 0.05 ℃/s. When the cooling rate was 0.05 ℃/s, the carbon partitioning was adequate and 12.01% residual austenite was obtained. The morphology of residual austenite was filmy or obvious blocky. With increasing the cooling rate to 10 ℃/s, less than 6% of residual austenite was retained at room temperature and the residual auste-nite was in the shape of film or small block. In addition, the hardness of the tested steel changed with the cooling rate, because both the microstructure evolution and the residual austenite volume fraction were different at different cooling rate. When the cooling rate was very slow, the carbon solid solution strengthening and martensite dislocation strengthening were weak, and the fraction of residual austenite was high. They minimized the hardness of the tested steel to HV508. The Vickers hardness of the steel was very high when the cooling rate was faster than 10 ℃/s, due to the solid solution strengthening of carbon and dislocation strengthening. The Vickers hardness y of the tested steel and cooling rates x accord with a double exponential decay relationship: y=-42.23exp(-x/4.75)-38.27exp(-x/0.17)+573.76.
邓杰, 孙新军, 张涛, 宋新莉, 梁小凯, 马玉喜, 向志东. 冷却速率对中锰马氏体耐磨钢微观结构及硬度的影响[J]. 材料导报, 2020, 34(10): 10126-10131.
DENG Jie, SUN Xinjun, ZHANG Tao, SONG Xinli, LIANG Xiaokai, MA Yuxi, XIANG Zhidong. Effect of Cooling Rate on Microstructure and Hardness of Medium Manganese Martensitic Wear-resistant Steel. Materials Reports, 2020, 34(10): 10126-10131.
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2020, Vol. 34 
