论文部分内容阅读
本文利用X射线对不同碳含量钢的表面微观屈服强度进行了研究。试验结果表明,表面微观屈服强度σ_(ms)远低于整体材料的屈服限,是一个反映表面抵抗塑性变形能力大小的参量。材料光滑疲劳极限往往是由裂纹荫生所控制的,与表面抵抗塑性变形的能力有关。本试验表明不同材料的σ_(ms)与存活率为50％疲劳极限的关系为:σ_(ms)=(0.81—1.02)σ_(-1);40Cr不同热处理状态的σ_(ms)与存活率为99.9％疲劳极限的关系为:σ_(ms)=(0.98—1.10)σ_(-1)。σ_(ms)的测定要比疲劳极限σ_(-1)的测定省时得多,有可能在工程上获得应用。
In this paper, the surface microscopic yield strength of steels with different carbon content was studied by X-ray. The experimental results show that the microscopic yield strength of the surface, σ_ (ms), is much lower than the yield limit of the whole material, which is a parameter that reflects the surface resistance to plastic deformation. The smooth fatigue limit of the material is often controlled by the crack shade, which is related to the ability of the surface to resist plastic deformation. The results show that the relationship between the σ_ (ms) of different materials and the fatigue limit of 50% survival rate is as follows: σ ms = 0.81-1.02 σ _ -1; and the σ ms and survival rate of 40Cr heat- The relationship of 99.9% fatigue limit is: σ_ (ms) = (0.98-1.10) σ_ (-1). The determination of σ_ (ms) is much more time-consuming than the determination of the fatigue limit σ_ (-1), which may be applied in engineering.