Enhanced surface radiation damage resistance in SETE-modified RAFM steel

作者：Wang, Lusheng; Li, Ping^*; Dai, Jiren; Yan, Siliang; Meng, Miao; Xue, Kemin^*

来源：Applied Physics A: Materials Science and Processing , 2022, 128(7): 592.

DOI：10.1007/s00339-022-05688-6

• Nuclear materials
• Microstructure
• Radiation damage

The enhancement of radiation surface damage resistance of RAFM steel has been crucial to the failure protection and engineering application of nuclear fusion reactors. Here, a novel spatial extrusion-twist-extrusion (SETE) process was proposed to improve the radiation surface damage resistance through microstructures modification. The transmission electron microscope (TEM) and scanning electron microscope (SEM) were performed to investigate and reveal the behavior and mechanism enhancement of surface radiation damage. Crack and ablation were investigated in the initial sample, while only smaller bubbles and shallow depth channels were observed in the SETE-deformed samples. Additionally, the increase of dislocations and grain refinement caused by the SETE deformation, can effectively promote the recombination of irradiation defects, and weaken stress concentration by inhibiting the aggregation and growth of helium bubbles, hence inhibiting crack initiation.

• 单位
  华中科技大学; 北京科技大学