Effect of One-step Partitioning Process on Microstructure and Properties of Low Alloy Wear-resistant Steel
LI Jian1, JIA Juan1, SONG Xinli1, SUN Xinjun2, FAN Lixia1, MA Yuxi1, LIANG Xiaokai2
1 The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081 2 Department of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081
Abstract: Effect of one-step partitioning process on the microstructure evolutions, mechanical properties, retained austenite content and morphology of a low alloy wear-resistant steel were studied by means of the scanning electron microscope (SEM), X-ray diffraction (XRD) and transmission electron microscope (TEM). The results indicate that the microstructure is consisted of the lath primary martensite, block fresh martensite and retained austenite in the wear-resistant steel after partitioning treatment, the retained austenite is emerged in the form of thin film between martensite laths (width about 100 nm) and block along the grain boundaries (about 300—400 nm in size). As the increase of partitioning tempe-rature, the content of initial martensite decreases and the fresh martensite increases gradually, the content of retained austenite and the carbon content of the steel increase first and then decrease; as the increase of partitioning time, the martensite boundary becomes blurred and the precipitates increase, the content of retained austenite also increase first and then decrease, and the higher the retained austenite content, the better the ductility of the material. When partitioning temperature is 235 ℃ and time is 30 min, the content of retained austenite is highest, 8.1vol%; the carbon content is 1.02wt%, the hardness of the steel is 52.3HRC and the elongation is 12%.
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LI Jian, JIA Juan, SONG Xinli, SUN Xinjun, FAN Lixia, MA Yuxi, LIANG Xiaokai. Effect of One-step Partitioning Process on Microstructure and Properties of Low Alloy Wear-resistant Steel. Materials Reports, 2019, 33(18): 3113-3118.
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2019, Vol. 33 
