作　　者： ; ; ; ;

机构地区： 西安理工大学材料科学与工程学院

出　　处： 《材料工程》 2005年第6期45-49,共5页

摘　　要： 通过不同扩散工艺实验,研究了热浸渗铝钢的抗氧化和剥落性能及其机理。结果表明,随扩散温度升高和时间延长,扩散层的空洞不断增加,次外层和过渡层之间空洞逐步聚集连接成波浪线状空洞带。在高温氧化期间,空洞带又连接成平行于表面的线状裂纹,其内部产生了内氧化。因此,渗铝钢的抗循环氧化和剥落性能不仅与扩散层组织和表面的氧化速度有关,而且与扩散层的空洞和内氧化有关。最佳的扩散工艺参数是900℃×2h。 The cyclic oxidation, spalling resistance and mechanisms of hot dip aluminizing steel were studied by different diffusion treatment. The results show that, with the diffusion temperament rising and time prolonging, the voids of the diffusion layer continuously increase and a wavy voids zone forms between subsurface layer and transition layer due to the aggregation of voids. The wavy void zone aggregates further into a lineal crack parallel to surface and the internal oxidation occurs in it during high temperament oxidation. Therefore, the cyclic oxidation resistance of hot dip aluminizing steel is controlled both by the internal oxidation and external oxidation of diffusion layer and the formation of voids seriously influences cyclic spalling resistance. The optimum technical parameter is diffusion at 900°C for 2 hours.

关 键 词： 内氧化 氧化和剥落性能 扩散工艺 渗铝钢

领　　域： [金属学及工艺] [金属学及工艺] [金属学及工艺] [金属学及工艺]