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采用金相显微镜、X射线衍射仪、扫描电镜、硬度仪和冲击试验机,研究了热处理工艺对耐磨蚀高铬合金钢显微组织、硬度和冲击韧度的影响。结果表明,经1050℃油淬和250℃回火处理的中碳高铬合金铸钢显微组织基本为单相板条状马氏体,而950℃油淬和250℃回火处理的中碳高铬合金铸钢显微组织为混合马氏体。经1050℃油淬和250℃回火处理的中碳高铬合金铸钢V型缺口冲击吸收能量较高(11.2J),硬度54.9HRC,硬韧性配合较好。
The effects of heat treatment on the microstructure, hardness and impact toughness of the wear-resistant high-chromium alloy steel were studied by means of metallographic microscope, X-ray diffraction, scanning electron microscopy, hardness tester and impact tester. The results show that the microstructure of medium carbon high chromium alloy cast steel after quenching at 1050 ℃ and tempering at 250 ℃ is basically single phase lath martensite. However, the microstructure of medium carbon steels with oil quenching at 950 ℃ and tempering at 250 ℃ High chromium alloy steel microstructure for the mixed martensite. The V-notch impact energy of the medium-carbon high-chromium alloy cast steel after quenching at 1050 ℃ and tempering at 250 ℃ is higher (11.2J), the hardness is 54.9HRC, and the toughness is better.