中国电机工程学报
中國電機工程學報
중국전궤공정학보
ZHONGGUO DIANJI GONGCHENG XUEBAO
2011年
29期
103-109
,共7页
超超临界%新型奥氏体%HR3C%性能%析出物
超超臨界%新型奧氏體%HR3C%性能%析齣物
초초림계%신형오씨체%HR3C%성능%석출물
ultra-supercritical units%new austenite%HR3C%performance%precipitate
通过对材料性能、金相、扫描电镜（scanning electron microscope，SEM）、能谱（energy disper sespectrum，EDS）、氧化皮、碳化物萃取、透射电镜（transmission electron microscope，TEM）等的分析，对在超超临界机组运行5400和25000h的新型奥氏体耐热钢HR3C进行老化研究，经研究表明HR3C运行25000h后性能的变化主要表现为向火侧室温抗拉强度上升4％，屈服强度下降10％；650℃拉伸性能略有下降；压扁时有脆化，硬度明显提高，表明已发生时效强化；内外壁氧化皮形成致密的Cr2O3层；组织无明显老化，析出物主要为Z相、M23C6和M6C型，碳化物沿晶界较明显析出；运行25000h后析出的碳化物中M6C和M23C6含量明显高于运行5400h后析出的含量，表明已有M23C6型碳化物向M6C型碳化物过渡。
通過對材料性能、金相、掃描電鏡（scanning electron microscope，SEM）、能譜（energy disper sespectrum，EDS）、氧化皮、碳化物萃取、透射電鏡（transmission electron microscope，TEM）等的分析，對在超超臨界機組運行5400和25000h的新型奧氏體耐熱鋼HR3C進行老化研究，經研究錶明HR3C運行25000h後性能的變化主要錶現為嚮火側室溫抗拉彊度上升4％，屈服彊度下降10％；650℃拉伸性能略有下降；壓扁時有脆化，硬度明顯提高，錶明已髮生時效彊化；內外壁氧化皮形成緻密的Cr2O3層；組織無明顯老化，析齣物主要為Z相、M23C6和M6C型，碳化物沿晶界較明顯析齣；運行25000h後析齣的碳化物中M6C和M23C6含量明顯高于運行5400h後析齣的含量，錶明已有M23C6型碳化物嚮M6C型碳化物過渡。
통과대재료성능、금상、소묘전경（scanning electron microscope，SEM）、능보（energy disper sespectrum，EDS）、양화피、탄화물췌취、투사전경（transmission electron microscope，TEM）등적분석，대재초초림계궤조운행5400화25000h적신형오씨체내열강HR3C진행노화연구，경연구표명HR3C운행25000h후성능적변화주요표현위향화측실온항랍강도상승4％，굴복강도하강10％；650℃랍신성능략유하강；압편시유취화，경도명현제고，표명이발생시효강화；내외벽양화피형성치밀적Cr2O3층；조직무명현노화，석출물주요위Z상、M23C6화M6C형，탄화물연정계교명현석출；운행25000h후석출적탄화물중M6C화M23C6함량명현고우운행5400h후석출적함량，표명이유M23C6형탄화물향M6C형탄화물과도。
Through the analysis of the performance, metallographic, scanning electron microscope （SEM）, energy disperse spectrum（EDS）, oxide, carbide extraction, and transmission electron microscope（TEM）methods, the aging research of the new austenitic heat-resistant steel HR3C was conducted in ultra-supercritical units after service for 5 400 hours and 25 000 hours. The research shows that after service for 25 000 hours the performance of HR3C changes： the main tensile strength increases by 4%, yield strength decreases by 10%; 650 ~C tensile properties decrease slightly; it becomes brittle when being crushed, the hardness is increased observably, indicating that aging has taken place to strengthen; a dense oxide layer of Cr203 is formed in outer and inner oxide scale; tissue had no significant aging, precipitat6s are mainly Z-phase, M23C6 and M6C , carbide was obviously precipitated along the grain boundaries; the content of M6C and M23C carbide precipitation after service for 25 000 hours is significantly higher than after service for 5 400 hours, which showed that a part of M23C6 carbide precipitation had been transformed into M6C carbide precipitation.
