我厂制造的车轴上曾多次出现过内部微裂纹和端头开裂等缺陷,一度还影响到车轴的生产任务。因此,通过检查来判明这类缺陷的性质是十分必要的。一、车轴内部微裂纹的检查与分析所谓微裂纹,通常是指肉眼不能看见,需借助一定的手段,如用放大镜、显微镜,或用酸浸蚀法才能观察到的裂口,以及用无损探伤仪才能检查出来的线条状缺陷。钢材从冶炼到加工制造成成品的过程中,产生裂纹的原因颇多,这里主要讨论 I have repeatedly produced on the shaft of the factory had internal defects such as micro-cracks and head cracking, once also affect the axle production tasks. Therefore, by checking to determine the nature of such defects is very necessary. First, the examination and analysis of the internal micro-cracks Axle The so-called micro-cracks, usually refers to the naked eye can not see, need to resort to certain means, such as using a magnifying glass, microscope, or acid etching method to observe the gap, and non-destructive flaw detector Can check out the linear defects. There are many reasons for cracks in the process of steelmaking from smelting to processing and manufacturing, mainly discussed here