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GX-8(1Crl2Ni2WMoVNb)钢属于马氏体型稳定不锈钢,在航空发动机上已采用多年,根据产品要求,需检查材料和产品的晶粒度。但多年来部内外有关单位在生产检验中对其晶粒腐蚀效果不理想。使用通常的腐蚀剂腐蚀,钢的组织腐蚀较重,很大程度上掩盖了晶界显示,使之在明场和暗场下,晶粒度判定都比较困难。
GX-8 (1Crl2Ni2WMoVNb) steel is martensitic stable stainless steel, which has been used for many years in aeroengines. According to the product requirements, it is necessary to check the grain size of materials and products. However, the relevant units inside and outside the Ministry for many years have not achieved satisfactory results in the grain erosion test during the production inspection. Corrosion using the usual etchant, the corrosion of steel heavier, to a large extent masked the grain boundary display, making it in the bright field and dark field, the grain size determination is more difficult.