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对高温加热后的9Cr13钢采用不同冷却介质进行淬火,随后均进行空冷,分析了不同冷却介质对高温加热后钢的表层组织、显微硬度以及心部韧性的影响。结果表明:不同冷却介质对9Cr13钢组织形貌、硬度及断口形貌有较大影响。当冷却介质为水时,表层组织中出现大量的片状马氏体,并出现脱碳现象,表层硬度最高,心部韧性较差,断口韧窝较少且出现大面积的较平区域;当冷却介质为10%盐水时,表层出现部分板条马氏体,硬度降低;冷却介质为机油时,表层组织出现大量细小的板条马氏体;当冷却介质为水-油双液时,表层组织中表现为大量的细小板条状马氏体,硬度分布均匀,且心部韧性较高,断口中出现大量小而深的韧窝。
After quenching 9Cr13 steel heated by high temperature with different cooling media, all of them were air-cooled. The effects of different cooling media on surface microstructure, microhardness and core toughness of steel after high temperature heating were analyzed. The results show that: different cooling medium on the 9Cr13 steel morphology, hardness and fracture morphology have a greater impact. When the cooling medium is water, a large amount of lamellar martensite appears in the surface layer and appears decarburization, the surface hardness is the highest, the heart toughness is poor, the fracture dimple is less and a large flat area appears; When the cooling medium is 10% brine, some lath martensite appears on the surface and the hardness decreases. When the cooling medium is oil, a large number of fine lath martensite appears in the surface layer. When the cooling medium is water-oil double liquid, The organization showed a large number of small lath martensite, uniform hardness distribution, and higher heart toughness, a large number of small and deep dimples appear in the fracture.