淬硬层略有浮凸，并受到来自未淬火的基体的挤压力，这对于提高硬化带的接触疲劳强度是有利的。
The quenching strap is a bit higher than unquenched area, it is stressed by its neighborhood. This is beneficial to the wear resistance of quenched strap.
磨削淬硬是利用未淬硬钢零件磨削加工中产生的热—机械复合作用直接对其进行表面形变淬火的新工艺。
A new surface deformation quenching process which utilized the composite thermal and mechanical effects generated in grinding to harden the surface of work-piece is introduced.
垂直于轴线的裂纹是因为淬火快速冷却时。厚壁处未淬透以及截面尺寸突变产生的弧形裂纹。
Crack perpendicular to the axis is caused on too rapid quench cooling, non-hardenability of the thick-walled department, as well as mutation of cross-section size. This is a typical arc-shaped crack.
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