摘要
研究了40Cr钢试样感应淬火后的组织和淬硬层深度。感应加热的电流频率为15kHz，加热功率及感应圈与试样之间的相对移动速度分别为40kW、5．0～11．0mm／s和70kW、6．5～11．0mm／s。结果表明，试样经感应淬火后表面至心部的组织依次为马氏体、马氏体加铁素体、马氏体加铁素体加珠光体和珠光体加铁素体。经40kW、11．0mm／s感应淬火的试样，淬硬层马氏体成分不均匀；而经70kw、6．5mm／s淬火的试样，淬硬层马氏体比较粗大；其他试样淬硬层马氏体细小。试样的淬硬层深度均为0．80～2．27mm，过渡层与淬硬层的深度比为24％～38％。
The microstructure and the hardened depth of 40Cr steel specimens was investigated after induction hardening. The current frequency of induction heating is 15 kHz, and the heating power and movement speed of induction coil relative to the sample are 40 kW, 5 - 11 mm/s and 70 kW, 6.5 - 1 lmm/s, respectively. The results show that the mierostruetures from the surface to core of specimen induction hardened are martensite, martensite plus ferrite, martensite plus ferrite plus pearlite, and pearlite plus ferrite in proper order. Martensite composition in the case of specimen induction hardened at 40 kW and 11. 0 mm/s is non-uniform, whereas martesite in the case of specimen induction hardened at 70 kW and 6.5 mm/s is coarser, and martesite in the case of other samples is fine. The hardened layer of the all samples is as deep as 0.80 -- 2.27 mm, and the ratio of transition layer depth to hardened layer depth is 24% ~ 38%
出处
《热处理》
CAS
2015年第5期11-14,共4页
Heat Treatment
