It's a feasible practice to quench in air for castings made of steels with higher hardenability to reduce or avoid its deformation and crack during heat treatment process.

采用高淬透性钢进行空冷淬火是一种减少铸件热处理变形和开裂的有效措施。

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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.

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。

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