用裂纹密度和晶界裂纹的比例对晶界氧化的程度及裂纹扩展情况定性地加以分析。

The oxidation degree of grain boundaries and crack propagation are qualitatively analyzed based on crack density and percentage of intergranular crack.

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无论是淬火或淬回火态的试样其热疲劳裂纹主要沿着碳化物与基体脱开处及晶界裂纹桥接而扩展。

The thermal fatigue crack propagated mainly through the break-age of the interface of carbide and grain boundaries for either quenched or quenched and tempered steel.

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裂尖前方可能发生形变孪晶，裂纹沿孪晶界扩展。

Local cleavage fracture might happen in the front of crack tip.

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