ITER PF导体缩径成型机辊轮失效分析

Failure analysis on ITER PF conductor necking compaction machine roller

针对ITER PF导体缩径成型机的辊轮失效问题进行了系统的研究及分析。通过对产生裂纹的辊轮进行取样,从金相组织、表面形貌、断口能谱分析及洛氏硬度测量分析,讨论辊轮失效的具体原因,同时建立Ansys有限元模型,分析验证成型机辊轮强度可靠性。研究结果表明,辊轮材料含有大量分布不均、粗大聚集的碳化物及成型机本身由于设计因素造成的应力集中,是辊轮产生裂纹的主要因素,为下一步成型机的改进完善提供了充分的理论依据。

In this paper, we studied the problem of the ITER PF conductor necking compaction machine roller failures. First of all, we intercepted small amounts of sample in cracks rollers. After that, carried microstructure, surface morphology, the frac- ture energy spectrum analysis, Rockwell hardness measurement, analysis of the strength and specific cause of failure of the roller were discussed. The results show that design factors that caused stress concentration and the roller material contained a large number of uneven distribution of carbide are the main factors of the roller cracks. This paper provides a sufficient basis for further improvements.