Cracks may sometimes appear on parts after heat treatment. Through macroscopic and microcosmic examination and analysis, reasons for cracks could be chased down to avoid similar errors.

• 零件在热处理后,有时会出现裂纹,通过对裂纹宏观及微观的检查分析,找出产生裂纹的原因,以避免在今后的工作中出现同样的错误。