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问题的提出在检验低倍试片时,尤其是高合金钢的低倍试片,如1Cr18Ni9Ti、Cr17Ni2等钢种,有时会在试片的整个截面上出现类似于针刺状的孔洞,即通称为“针孔”的宏观缺陷。而一些航空材料的技术条件上明文规定“针孔”是不允许存在的低倍缺陷,因此如何正确的判断它就显得比较重要。
The question raised When testing low magnification specimens, especially high alloy steel low magnification specimens, such as 1Cr18Ni9Ti, Cr17Ni2 and other steel species, sometimes appear in the entire cross-section of the specimen similar to acupuncture-like holes, known as For the “pinhole ” macro defects. However, the technical conditions of some aviation materials expressly stipulate that “pinholes” are impermissible low magnification defects, so how to judge it correctly is more important.