摘要
研究了热浸渗铝钢扩散层空洞对循环氧化和剥落性能的影响规律及其机理。结果表明 ,随扩散温度升高和时间延长 ,扩散层空洞不断增加 ,次外层和过渡层之间空洞逐步聚集连接成平行于表面的波浪线状空洞带 ,使高温氧化过程中扩散层产生了内氧化 ,氧化动力学曲线偏离平方抛物线规律而呈现抛物线—直线规律。因此 ,渗铝钢的长期氧化速度同时受扩散层内氧化和外氧化的控制。空洞(空洞带 )的形成对循环剥落性能也产生严重影响。探讨了空洞 (空洞带 )和内氧化的形成机理。
The effects of the voids in the diffusion layer on cyclic oxidation and spalling resistance of aluminized steel was investigated. The results show that, the voids of the diffusion layer continuously increase and a wavy void zone parallel to surface forms between subsurface layer and transition layer due to voids aggregating with the temperature rising and time prolonging. This leads to the internal oxidation of the diffusion layer during high temperature oxidation, and the kinetic curves of oxidation deviate from square parabola relation into the parabola-straight relation. Therefore, the long-term oxidation speed of aluminized steel is controlled both by the internal and external oxidation of diffusion layer and the formation of voids (voids zone) seriously influences cyclic spalling resistance. The formation mechanism of the voids and internal oxidation are also discussed.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2004年第6期96-100,共5页
Transactions of Materials and Heat Treatment
基金
河南省重点攻关项目 (0 4 2 30 2 350 0 )
河南省高校杰出人才创新工程项目 (2 0 0 1KYCX0 0 9)
洛阳市科技计划项目 (0 4 0 2 2 1 )
关键词
渗铝钢
孔洞
内氧化
氧化和剥落性能
Diffusion
Internal oxidation
Oxidation resistance
Scanning electron microscopy
Spalling
X ray diffraction analysis
