电焊机2025，Vol.55Issue(10)：148-158,177,12.DOI:10.7512/j.issn.1001-2303.2025.10.16
Inconel 740H焊接接头长时时效后的力学性能和组织稳定性
Mechanical Properties and Microstructural Stability of Inconel740H Welded Joint after Long-term Aging
刁旺战 1王萍 1张松 1赵卫君 1徐祥久 1黄超 2赵庆禄2
作者信息
- 1. 低碳热力发电技术与装备全国重点实验室,黑龙江 哈尔滨 150046||哈尔滨锅炉厂有限责任公司,黑龙江 哈尔滨 150046
- 2. 哈尔滨锅炉厂有限责任公司,黑龙江 哈尔滨 150046
- 折叠
摘要
Abstract
The 700℃advanced ultra-supercritical coal-fired boiler represents the core research approach for future thermal power technology,Inconel740H is an important candidate material for 700℃grade units.This study used the hot-wire TIG welding process to weld solid solution Inconel740H,followed by aging strengthening heat treatment(800℃/4 h/AC).After heat treatment,the welded joints was subjected to isothermal aging tests at 700℃for 1 000-10 000 h.The study analyzes the trend of microstructural stability and mechanical properties after aging.The results indicate that during the aging pro-cess,the γʹ phase in the base metal and weld DCR zone of the welded joint remains spherical,and the coarsening rate con-forms to the LSW ripening theory.Between 5 000-8 000 h,the γ′ phase in the IDR zone of the weld seam gradually trans-forms from spherical to cubic.No harmful phase precipitation was found in the welded joint after 10 000 hours of aging,in-dicating high structural stability.After long-term aging for 10 000 h,the impact toughness decreases from 63.4 J/cm2 to 27 J/cm2.The change of impact toughness is closely related to the morphology and size changes of grain boundary carbides M23C6.The yield and tensile strengths at room temperature and 700℃gradually increase from ASHT to 3 000 h of long-term aging,and then gradually decrease with extended aging time,the trend of change is consistent with the correspondence between CRSS and γ′ diameter.关键词
Inconel 740H/长时时效/力学性能/组织稳定性Key words
Inconel740H/long-term aging/mechanical properties/microstructural stability分类
矿业与冶金引用本文复制引用
刁旺战,王萍,张松,赵卫君,徐祥久,黄超,赵庆禄..Inconel 740H焊接接头长时时效后的力学性能和组织稳定性[J].电焊机,2025,55(10):148-158,177,12.
