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一、前言屈服强度至今仍是大部分重要的机器零件强度计算的基础。钢经淬火和中、高温回火(调质)以后,能大幅度地提高其屈服强度σ_(0.2),但是屈服强度一般不是一个常量,而是一个变量,它随着回火温度的升高而降低。对于大部分中碳和中碳低合金结构钢来说,一般在400～600℃或再稍高的温度范围内回火。实验表明,此时屈服强度与回火温度在很大程度上呈直线变化关系,但目前尚无一合适的理论说明这一变化规
I. INTRODUCTION Yield strength is still the basis of most important machine part strength calculations to date. Steel after quenching and tempering (tempering) at medium temperature and high temperature can significantly improve the yield strength of σ_ (0.2), but the yield strength is generally not a constant, but a variable, it increases with the tempering temperature Lower. For most medium-carbon and medium-carbon low-alloy structural steels, it is generally tempered in the temperature range of 400-600 ° C or slightly higher. Experiments show that the yield strength and tempering temperature at this time in a largely linear relationship, but there is no suitable theory to explain the change in regulation