Through test analysis, we found that it is caused by the large size grain in this section, as well as the structure stress in this section over the material strength.

经试验分析是由于该段晶粒粗大，淬火时组织应力超过该段的材料强度所致。

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Through test analysis, we found that it is caused by the large size grain in this section, as well as the structure stress in this section over the material strength.

经试验分析是由于该段晶粒粗大，淬火时组织应力超过该段的材料强度所致。

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