低活化马氏体钢热等静压焊接接头性能初步研究

Preliminary study on the performance of hot isostatic pressing diffusion welding joint for low activation martensitic(CLF-1) steel

研究了低活化马氏体钢(CLF-1)热等静压(HIP)焊接接头的性能,经980℃/1h/空冷+740℃/2h/空冷的性能热处理后,接头组织保持着CLF-1钢母材回火马氏体组织;常温拉伸性能与母材相当,断口为韧窝状且有第二相粒子产生,为塑性断裂且断于焊缝;常温冲击功最高为母材的26.2%。初步分析认为焊接表面制备状态、表面污染物、表面清洗状态、表面氧化膜都会影响基体原子充分扩散,导致界面扩散层不均匀,焊缝裂纹敏感性增强,冲击功低,且不稳定。

The performance of hot isotopic pressing(HIP) welded joint for low activation martensitic(CLF-1) steel was studied preliminarily. The welded joint organization was keeping tempered martensite after heat treatment at 980℃/1 h/air cooling+ 740℃/2 h/air cooling. The room temperature tensile properties of welded joint were similar as the base metal, the dimpled fracture and the secondary particles were produced, which was plastic fracture and cracked at welded joint. The room temperature impact energy of welded joints was 26.2% of base metal. Preliminarily results indicated that the non-uniformity of HIP interface diffusion layer, sensitivity enhancement of welded joint crack, impact work reduction and some instabilities would be resulted from the incomplete matrix atoms diffusion due to the undesirable surface processing state, harmful surface contaminants, surface cleaning condition, oxide film etc.