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。
