Then the reason is attributed to the unqualified metalographic structure of the material after careful analysis 对其原因进行分析,结论为供货状态的金相组织不合格。
2.
Aerospace series ; metallic materials ; part 2 : coding of metallurgical condition in delivery condition ; german version en 2032 - 2 : 1994 航空航天系列.金属材料.第2部分:供货状态下冶金状态