Is hardness tested on a surface that has been ground to remove decarburization? 硬度测试是不是在磨去脱碳层的表面上进行？
Results show that the crack is mainly intergranular and there is no decarburization and oxidation at the edge of the crack. 根据齿座表面裂纹主要呈沿晶扩展，裂纹两侧无脱碳和氧化现象，认为该裂纹为淬火裂纹。
