摘要
6CrW2MoVSi钢热处理显微组织细化均匀，退火后碳化物平均尺寸0．6μm；淬火后钢中马氏体以板条状马氏体为主，并有少量针状马氏体，经950℃淬火后针状尺寸小于2．5μm。实验钢硬度随淬火温度升高而升高共分3段，在910～980℃范围淬火，硬度升高随淬火温度上升的趋势减缓。在较高温度淬火后，回火出现低温和高温两个回火沉淀硬化区，220～240℃回火。沉淀硬化的硬度为54～58HRC；540～570℃回火，沉淀硬化的硬度为52～56HRC。对照相平衡计算结果，热处理过程的相组成比平衡态滞后，依此，可以分析其显微组织及硬度特征。
After heat treatment, 6CrW2MoVSi steel presents a refine microstructure, the average size of carbide after annealing is 0.6 Ixm. After quenching, there is most lath-shaped martensite and a small amount of acicular martensite in the steel. The size of aeicular after quenching at 950 ℃ is less than 2.5μm. The hardness of experimental steel increases with the quenching temperature increases. There are three sections. When the quenching temperature is between 910 -980 ℃, the hardness increases slowly when the quenching temperature increases. After quenching at a higher temperature, there is a low-temperature tempering precipitation hardening zone and a high-temperature zone. After tempering between 220 - 240 ℃ , precipitation hardness is 54 - 58 HRC. After tempering between 540 - 570 ℃ , precipitation hardness is 52 - 56 HRC. By making reference with the result of Phase equilibrium calculation, it is found that phase formation in the process of heat treatment lags behind that in the equilibrium state, and accordingly the microstructure and hardness features can be analyzed.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第1期131-134,共4页
Transactions of Materials and Heat Treatment
基金
辽宁省教育厅高等学校科研项目((L2012421)
