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| HR3C钢焊接接头高温时效后的显微组织和力学性能 | |
| 引用本文： | 李太江,刘福广,陈伟武,朱建华,王彩侠,刘立营,王博.HR3C钢焊接接头高温时效后的显微组织和力学性能[J].金属热处理,2012,37(8):16-20. |
| 作者姓名： | 李太江 刘福广 陈伟武 朱建华 王彩侠 刘立营 王博 |
| 作者单位： | 1. 西安热工研究院有限公司,陕西西安,710032 2. 华能海门电厂,广东汕头,515000 3. 华能金陵电厂,江苏南京,210034 |
| 摘 要： | 通过光学金相显微镜、透射电子显微镜观察和力学性能试验,研究了HR3C钢焊接接头高温时效后的显微组织和力学性能。结果表明,经650℃时效,HR3C钢焊接接头的强度和硬度升高,焊缝硬度上升幅度大于母材;焊缝的时效脆化倾向明显,时效7000 h后缺口冲击吸收能量都保持在15 J以下。焊缝区晶界处M23C6相的连续网状分布及σ相、G相的存在导致了其较低的缺口冲击吸收能量和时效脆性,而晶内均匀细小Z相的沉淀强化作用则提高了接头的强度和硬度。 |
| 关 键 词： | 超超临界锅炉 HR3C奥氏体耐热钢 焊接接头 时效脆化 |
Microstructure and mechanical properties of HR3C steel weld joints aged at high temperature |
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| LI Taijiang,LIU Fuguang,CHEN Weiwu,ZHU Jianhua,WANG Caixia,LIU Liying,WANG Bo.Microstructure and mechanical properties of HR3C steel weld joints aged at high temperature[J].Heat Treatment of Metals,2012,37(8):16-20. | |
| Authors: | LI Taijiang LIU Fuguang CHEN Weiwu ZHU Jianhua WANG Caixia LIU Liying WANG Bo |
| Affiliation: | 1(1.Xi’an Thermal Power Research Institute Co.Ltd,Xi’an Shaanxi 710032,China;2.Huaneng Haimen Power Plant, Shantou Guangdong 515000,China;3.Huaneng Jinling Power Plant,Nanjing Jiangsu 210034,China) |
| Abstract: | Microstructure and mechanical properties of HR3C steel weld joints aged at high temperature were studied by optical microscope and transmission electron microscope observation and mechanical property test.The results show that the tensile strength and hardness of the HR3C steel weld joints aged are enhanced,however the Charpy impact absorbed erergy decrease rapidly and keeps about 15 J aged for 7000 h.Continuous distribution of net-like M23C6 and existence of σ phase and G phase along grain boundary result in the aging embrittlement of weld metal,and dispersion strengthening of fine Z phase precipitating in austenitic matrix increase the hardness and strength. |
| Keywords: | ultra-supercritieal (USC) boiler HR3C austenitic heat resistant steel weld joints aging embrittlement |
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