摘要
本文进一步研究了热处理温度和循环温度对3Gr2W8V 钢热疲劳抗力的影响,探讨了热疲劳抗力与常规力学性能之间的联系。结果表明:热疲劳抗力随热处理温度不是单调变化的,分别有一个最佳的淬火温度和最佳的回火温度;随着循环上限温度的升高,热疲劳抗力显著下降,最佳回火温度向高温方向移动,但最佳淬火温度基本不变;在本试验条件下,热疲劳抗力主要受强度控制,在强度和塑性取得适当配合时,热疲劳抗力最大。
The effects of the heat treatment temperature and the cycle temperature upon the thermal fatigue resistance of 3Cr2W8V steel are further studied.The relationships between the thermal fatigue risistance and conventionalmechanical properties are also discussed. It has been shown that the thermalfatigue resistance does not vary with the heat treatment temperature mono-tonously, but instead it depends upon the suitable quenching temperature orthe proper tempering temperature. With the elevation of upper cycle tempe-rature, the thermal fatigue resistance will decrease considerably, There willbe only little change in the above mentioned quenching temperature, howev-er, the tempering temperature will be elevated. Under the given testing con-ditions, the thermal fategue resistance primarily depends on the strength,with adequate combination of the strength and plasticity it can result in aoptimum thermal fatigue resistance.
