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多年来在机械制造行业中普遍认为作为冶金缺陷的发纹是促使工件应力集中、形成疲劳开裂的策源地。因而在判断原材料或产品零件能否合格使用问题上,往往产生“宁严勿宽”的思想,这在动力机械部门和军工口的同志表现更为突出。其结果是:一些本来可以使用的优质合金钢或重要成品零件,由于发纹超差而报废,给国家造成了不应有的损失。 发纹对零件在使用过程中的影响,这一问题早已引起了不少国内外有关人员的关注,但却很少有人进行实际考核研究,故至今在实际工作中仍处于“无发纹总比有发纹
Over the years in the machinery manufacturing industry generally considered as a metallurgical defect hair lines is to promote the workpiece stress concentration, the formation of a source of fatigue cracking. Therefore, judgments on the qualification of raw materials or product components often lead to the idea of “leniency rather than leniency.” This is especially true for comrades in the power machinery sector and the military. The result is that some of the fine quality alloy steels or important finished parts that could have been used were scrapped as a result of the excess of the hairline and caused undue losses to the country. Hairline on the parts in the process of using the impact of this issue has aroused the concern of many people at home and abroad, but few people actually conduct research, so far in actual work is still in the "no hair pattern ratio Hair lines