摘要
研究了气体渗氮层和激光淬火/渗氮层的N分布、微观结构、显微硬度及脆性。结果表明,激光淬火后的组织晶粒细小,晶界和位错、孪晶等缺陷数量增加,而N在晶界和缺陷处扩散激活能降低,使N的扩散速度和扩散通量提高,渗氮层厚度增加;同时渗氮层晶粒细小致密,细小的高硬度的Cr2N颗粒数目增加,使显微硬度值显著提高,渗氮层脆断的临界压力由气体渗氮层的3 N提高到激光淬火/渗氮层的6 N。
The N distribution, microstructure,microhardness and brittle of the gas nitriding layer and the laser quenching/ nitriding layer were studied. The results show that after laser hardening, the crystal grain is fined and twin crystals increase, but N needs in the defective area proliferation, the activation energy reduces, causes the propagation rate and the diffuse flux of N enhances,and the depth of nitriding layer increases; the grain of nitride layer is fined; the tiny Cr2N pellet number increases and the the microhardness enhances obviously. Brittle breaking critical pressure of nitriding layer increases from 3 N of the gas nitriding diffusion layer to 6N of the laser quenching/nitriding layer.
出处
《热加工工艺》
CSCD
北大核心
2012年第6期176-178,共3页
Hot Working Technology
关键词
激光淬火
渗氮
显微硬度
脆性
laser quenching
nitriding
microhardness
brittle
