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对淬火态的9Cr2Mo轧辊钢分别进行了550℃/1 h、550℃/3 h及550℃/6 h热处理。结果表明:在淬火态下,基体主要为粗大的片状马氏体,断口为典型的脆性断裂,力学性能及耐磨性较差;淬火后回火,随着回火时间的延长,组织及力学性能得到明显改善,当550℃/6 h回火时,基体中粗大的片状马氏体消失,主要为细小的板条状回火马氏体与粒状回火索氏体的混合组织,断口韧窝数量较多,具有一定的韧性断裂,力学性能及耐磨性最高。对淬火后的9Cr2Mo轧辊钢进行550℃/6 h回火有利于提高综合力学性能。
The quenched 9Cr2Mo steels were heat-treated at 550 ℃ for 1 hour, 550 ℃ for 3 hours and 550 ℃ for 6 hours respectively. The results show that the matrix is mainly coarse sheet martensite in the quenched state, the fracture is a typical brittle fracture, the mechanical properties and wear resistance are poor. After quenching and tempering, with the extension of tempering time, The mechanical properties are obviously improved. When the temperature is up to 550 ℃ / 6 h, the coarse lamellar martensite disappears in the matrix, which is mainly the mixture of fine lath tempered martensite and granular tempered sorbite, Fracture dimples more, with a certain toughness fracture, the highest mechanical properties and wear resistance. After quenching 9Cr2Mo roll steel 550 ℃ / 6 h tempering is conducive to improving the comprehensive mechanical properties.