低活化铁素体/马氏体钢厚板光纤激光焊接接头组织及力学性能分析
Microstructure and mechanical properties of fiber laser welded joints of reduced activation ferritic/martensitic CLF-1 steel heavy plate
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摘要: 针对核聚变反应堆试验包层模块(TBM)中使用的CLF-1低活化铁素体/马氏体钢进行焊接试验，采用15 kW光纤激光，实现了17.5 mm厚CLF-1钢的穿透焊接，得到了正反表面成形良好、无明显缺陷的焊接接头，并对接头显微组织及力学性能进行了分析研究. 结果表明,焊缝区主要为粗大的板条马氏体；熔合线附近热影响区为细小的板条马氏体和少量贝氏体；不完全淬火区为经焊接热循环作用下二次回火的回火索氏体及马氏体双相组织；接头室温及550 ℃高温抗拉强度较高，均断裂于母材；焊缝显微硬度高于母材，且热影响区无明显软化；接头冲击韧性良好. 接头综合力学性能良好.
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关键词:
- 低活化铁素体/马氏体钢 /
- 光纤激光焊接 /
- 显微组织 /
- 力学性能
Abstract: The reduced activation ferritic/martensitic CLF-1 steel used in the nuclear fusion reactor test blanket module (TBM) is welded by 15 kW fiber laser, and the penetration welding of 17.5 mm thick CLF-1 steel is realized. A sound joint forming can be obtained by optimizing the process parameters, and there are no obvious defects such as cracks and pores within the welded joint. Furthermore, the microstructure and mechanical properties of the welded joints are analyzed. The experiment results show that the microstructure of the weld mainly contains the thick lath martensite. The microstructure of the heat affected zone mainly contains the tempered sorbate and martensite dual phase structure caused by secondary tempering of welding thermal. At the average room temperature and 550 ℃, tensile strength of welded joint is very high. The fracture position is located at the base metal. The microhardness of the weld is significantly higher than that of base metal, and there is no obvious soft zone at the heat affected zone. The weld joints exhibit favorable impact toughness, so it has very good comprehensive mechanical properties. -
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