ZHENG Yangzeng ZHANG Fucheng Yanshan University
,
Qinhuangdao
,
China
金属学报(英文版)
The heterogeneous distribution of C and metallic alloying elements as well as the phase com- position changes before and after cold deformation of an Fe-Mn-Cr-C alloy have been stu- died by the use of Mssbauer spectroscopy.The austenites without and with C and metallic alloying elements are found in the alloy in as-solid solution state.While the martensites with- out and with C and alloying elements may be induced by cold deformation.The transforma- tion from austenite to martensite in the alloy is confirmed via theoretical computation and ex- periments to be controlled by the number of covalent electron pairs forming covalent bond in austenitic crystal cell of the alloy.The formation of strong covalent bond between C and me- tallic elements can vigorously retard the γ/α' transformation.
关键词:
heterogeneity
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程永兴
,
李根富
,
余少罗
金属学报
本文采用EPMA,AES和SEM技术,观察到Fe-Ni-Cr合金涂层和45号钢基体激光合金化后,其熔化区和热影响区之间的过渡区,存在明显的化学不均匀性特征,高温回火时尤为严重,以致形成过渡区一侧脱碳,而熔化区一侧增碳的现象。
关键词:
激光合金化
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heterogeneity
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transition zone
