喷丸对钨面对等离子体材料表面强化研究

Study on Surface Strengthening of Tungsten Plasma Facing Material by Shot Peening

摘要:

利用机械喷丸技术对钨核聚变面对等离子体材料进行表面强化研究，结合喷丸前后钨性能改善进行强化效果分析及喷丸参数的优化。主要包括微观形貌、晶粒细化、表面粗糙度、表面硬化和表面残余压应力等表征参数。其结果显示，对钨脆而硬的材料而言，在100%覆盖率情况下，0.3MPa喷丸压力、0.4mm陶瓷丸、100mm垂直喷丸距离是比较合适的喷丸参数，其材料表面性能提高显著。表面硬度提高高达53.3%，残余压应力提高8.3倍，表面细化晶粒现象明显，而且对表面粗糙度影响不大，最高1.5μm左右。

Abstract:

The mechanical shot peening technology is applied to study the surface strengthening of tungsten plasma facing materials for fusion device. The strengthening effect of tungsten after shot peening was discussed in detail, which included micro morphology, grain refinement, surface roughness, surface hardness and surface residual compressive stress. And the shot peening process parameters were also optimized. The results indicate that it is the optimum shot peening parameters for the brittle and hard tungsten that air pressure of 0.3 MPa, ceramic pellet with the diameter of 0.4 mm and 100 mm pellet distance, which induces the performance enhancement of tungsten plasma facing material. The surface grain refinement phenomenon is obvious. The surface hardness increasement of about 53.5% is obtained, and the residual compressive stress is increased by 8.3 times. And the influence of shot peening technology on surface roughness is not obvious. The maximum roughness is about 1.5μm.