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在金相分析中,用通常的硝酸酒精溶液侵蚀很难区分低合金钢中的板条状马氏体和板条状的贝氏体。 Lepera法能有效地侵蚀铁素体加不超过60%的马氏体双相钢,但对于低合金钢中的马氏体和贝氏体混合组织,仍难以将两者区分开来。这里介绍的侵蚀方法是改进Lepera法得到的。为了鉴别低碳低合金钢(0.07%C-Mn-Ni-Cr-Mo-V-B)淬火态下的板条状马氏体和贝氏体混合组织,经多次试验,得到了一种马氏体和贝氏体呈不同色彩的侵蚀剂和操作方法,具体如下: (1)金相试样经严格抛光,最后一次抛光用W1.5金刚石研磨膏进行,之后用清水抛去污渍; (2)将预先配制好的4%苦味酸酒精溶液和1%焦亚硫酸钠蒸馏水溶液,按1∶1.2混合制成侵蚀剂,将清洁的抛光试样浸入,不断晃动,经20s或更长时间
In metallographic analysis, lamellar martensite and lath-shaped bainite in low-alloy steels are difficult to distinguish using conventional nitric acid solution erosion. Lepera’s method effectively erodes ferrite plus up to 60% of martensite duplex steel, but it is still difficult to distinguish between martensite and bainite in low-alloy steels. The erosion method introduced here is to improve the Lepera method. In order to identify the mixed martensite and bainite martensite and bainite in the as-quenched low carbon low alloyed steel (0.07% C-Mn-Ni-Cr-Mo-VB) Body and bainite were different colors etchant and method of operation, as follows: (1) Metallographic samples were rigorously polished, the last polishing with W1.5 diamond paste, after which the stains were thrown off with clear water; (2 ) The prepared 4% picric acid alcohol solution and 1% sodium pyrosulfite distilled water solution, made by mixing 1: 1.2 erosion agent, the polished polished sample immersed, shaking, after 20s or longer