摘要
针对铝板铸轧工业中最常用的32Cr3Mo1V辊套材料,在实验室采用自制热疲劳试验机模拟热疲劳裂纹的产生和扩展过程。结果表明,热疲劳过程中所形成的高硬度、脆性氧化物在热循环应力作用下断裂(即氧化-应力开裂)是热疲劳裂纹产生和扩展的最主要原因;并根据这一结果,设计了采用激光合金化方法在辊套表面形成高铬固溶体合金层的方法,制作的合金层能够延缓、阻滞热疲劳裂纹的产生和扩展;并系统分析了合金层的成分、组织、硬度及其热疲劳性能。
Aiming at 32Cr3Mol V,most commonly used as roller shell material in aluminum plate casting and rolling industry,the article simulates the generation and spreading of the thermal fatigue crack in laboratory adopting self-made thermal fatigue tester. The results shows that the brittle oxide with high hardness produced in thermal fatigue cracked in thermal stress is main cause of thermal fatigue crack generation and spreading, that is oxide stress crack. According to the results, designs the method of forming high chromium solid solution alloy layer on roller shell surface by laser alloying method, the fabricated alloy layer is able to delay and block the generation and spreading of thermal fatigue crack, then analyzes the composition, structure and hardness of the alloy layer and its thermal fatigue performance.
出处
《有色设备》
2012年第1期9-12,22,共5页
Nonferrous Metallurgical Equipment
基金
广州有色金属研究院科技创新引导项目资助(2009A001)
