摘要
本文对高温气冷堆核电机组传热管高温段材料Incoloy 800H合金冲击性能进行研究,借助扫描电镜、X射线能谱和示波冲击试验等分析了试验温度以及热老化时间对Incoloy 800H合金冲击韧性和动态断裂韧性的影响。试验结果表明:固溶态Incoloy 800H合金在675℃的总冲击能量和动态断裂韧性比室温时降低约30%,主要原因是温度升高合金的强度降低。热老化300 h后室温和675℃的Incoloy 800H合金总冲击能量分别降低68.8%和55.4%,随着热老化时间的延长,冲击能量下降速度趋缓,热老化3000 h后,室温和675℃冲击能量比固溶态分别降低74.1%和60.3%,室温和675℃的动态断裂韧性降低约70%。热老化后冲击韧性降低的原因是晶界、孪晶界以及晶内大量析出相沉淀导致的材料塑性降低。根据总冲击吸收能量、动态载荷-位移曲线类型和断口韧性断面率判断热老化3000 h后Incoloy 800H合金仍具有良好的韧性。
The effects of test temperature and thermal aging on impact toughness and dynamic fracture toughness of Incoloy 800H alloy were studied by means of scanning electron microscope(SEM),energy dispersive spectrometer(EDS)and instrumented impact test.The results show that,the total impact energy(Et)and dynamic fracture toughness of solution treated Incoloy 800H alloy at 675℃were about 30%lower than that at room temperature,and the main reason was that the strength of the alloy decreased with the increase of temperature.After thermal aged for 300 h,the Et of Incoloy 800H alloy at room temperature and 675℃decreased by 68.8%and 55.4%respectively.With the extension of the thermal aging time,the impact energy decreased slowly.After thermal aging for 3000 h,the impact energy at room temperature and 675℃decreased by 74.1%and 60.3%compared with the solid-solution state,and the dynamic fracture toughness at room temperature and 675℃decreased by about 70%.The reason for the decrease of the impact toughness of aged samples was the plastic decrease of material caused by the precipitation of carbides on grain boundary,twin boundary and in the grain.It is concluded that Incoloy 800H alloy shows good toughness after 3000 h of thermal aging according to the total impact energy,the dynamic load-displacement curve type and the ductile section ratio of the fracture.
作者
唐丽英
李江
詹英杰
王庆武
徐安
龚兵
李季
周荣灿
TANG Liying;LI Jiang;ZHAN Yingjie;WANG Qingwu;XU An;GONG Bing;LI Ji;ZHOU Rongcan(Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,China;Huaneng Shandong Shidao Bay Nuclear Power Co.,Ltd.,Rongcheng 264312,China)
出处
《热力发电》
CAS
CSCD
北大核心
2021年第3期49-55,共7页
Thermal Power Generation
基金
国家科技重大专项(2017ZX06906009)
中国华能集团有限公司总部科技项目(HNKJ18-H41)。
