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给出了显露活塞环激光热处理金相组织的最佳侵蚀规范;得到了相变硬化区内隐蔽马氏体的形态。结合显微硬度测量,查明了熔化区内莱氏体组织为渗碳体与片状马氏体的混合物。
The optimal erosion criterion for revealing the laser heat treatment of the microstructure of the piston ring is given. The morphology of the concealed martensite in the phase transformation hardening zone is obtained. Combined with the measurement of microhardness, it was found that the ledeburite in the melting zone is a mixture of cementite and lamellar martensite.