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左图是三爪牙轮石油钻头小轴堆焊耐磨合金的金相组织。图中白色几何形状的是初生碳化物,一般是Cr_7C_3。骨骼状的是莱氏体。黑色区域为富钴固溶体。材料化学成份:C3.4%;Cr21.3%:W14.0%;Fe4.0%;Co余量。这种合金的耐磨性和抗蚀性等均较好。浸蚀试剂:酒精30毫升,硝酸5毫升,盐酸15毫
The left picture shows the metallographic structure of the wear-resistant alloy of three-jaw roller cone drills. The figure is a white geometric shape of primary carbides, usually Cr_7C_3. Bone is ledeburite. The black area is a cobalt-rich solid solution. Material Chemical composition: C3.4%; Cr21.3%: W14.0%; Fe4.0%; Co balance. The wear resistance and corrosion resistance of such alloys are better. Etching Reagents: Alcohol 30 ml, nitric acid 5 ml, hydrochloric acid 15 ml