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对单道次热压缩形变60%的高温轴承钢G80T在不同温度下保温后油淬处理,研究保温温度和保温时间对微观组织和力学性能的影响规律,并对微观组织和力学性能之间的关系进行分析。结果表明,随着固溶温度的升高,在1050℃之前奥氏体晶粒尺寸先缓慢增加到约7~8μm,然后随固溶温度的进一步提高而异常长大。试验钢的显微硬度随固溶温度先升高后降低,在1050℃固溶时显微硬度达到921 HV0.2,是细晶强化和碳化物析出强化共同作用所致。热力学计算结果表明,热压缩60%的G80T钢在重新奥氏体化过程中的晶粒长大行为受合金元素扩散控制,其扩散激活能为333 k J/mol。
The effect of holding temperature and holding time on microstructure and mechanical properties of G80T high temperature bearing steel with 60% single-pass hot compression deformation after heat preservation at different temperatures was studied. The effects of microstructure and mechanical properties Relationship analysis. The results show that with the increase of solution temperature, the austenite grain size slowly increases to about 7-8 μm before 1050 ℃, and then grows abnormally with the further increase of solution temperature. The microhardness of the test steel first increases and then decreases with the solution temperature, and the microhardness reaches 921 HV0.2 at 1050 ℃, which is caused by the combination of fine grain strengthening and carbide precipitation strengthening. The thermodynamic calculation results show that the grain growth behavior of 60% hot-reduced G80T steel during re-austenitization is controlled by alloying element diffusion with an activation energy of 333 kJ / mol.