两种A-USC电站用候选合金的微观组织及演变规律  被引量:4

Microstructure and Its Evolution of Two Candidate Alloys Used for A-USC Power Plant

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作  者:党莹樱[1] 赵新宝 杨征 张醒兴 尹宏飞[1] DANG Yingying;ZHAO Xinbao;YANG Zheng;ZHANG Xingxing;YIN Hongfei(Xi’an Thermal Power Research Institute Co.,Ltd,Xi’an 710032,Shaanxi Province,China;School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,Zhejiang Province,China;Xi’an Yitong Thermal Power Technology Service Co.,Ltd,Xi’an 710032,Shaanxi Province,China)

机构地区:[1]西安热工研究院有限公司,陕西省西安市710032 [2]浙江大学材料科学与工程学院,浙江省杭州市310027 [3]西安益通热工技术服务有限责任公司,陕西省西安市710032

出  处:《中国电机工程学报》2019年第17期5137-5143,共7页Proceedings of the CSEE

基  金:中国华能集团有限公司总部科技项目(HNKJ18-H12)~~

摘  要:实现700℃超超临界技术的关键是开发能够在高参数条件下长期安全运行的材料。以候选合金中的典型代表Inconel740H及自主研发合金HT1为对象,通过热力学模拟、长期时效试验,结合显微组织表征、显微硬度测定等方法对合金组织及其演变规律进行了研究。结果表明:2种合金标准热处理后的组织均由奥氏体基体γ及γ’,M23C6、MC等析出相组成,其中γ’为合金的主要强化相。随着时效时间的延长,γ’粒子的粗化规律符合LSW熟化理论;在现时效过程中,无η、σ等有害相析出。随着时间的增加,合金的显微硬度呈现先上升后下降的变化趋势,但整体波动值较小,体现出较好的组织稳定性。The key to realize 700 ℃ advanced ultrasupercritical technology is the development of materials with long term safe operation. Investigations were made on In 740 H the most promising alloy among the whole candidates and HT1 a new candidate developed domestic by thermodynamic simulation, long term exposure test, microstructure characterization and micro-hardness analysis. The results show that the microstructures of In 740 H and HT1 after standard heat treatment are both constituted of γ matrix, γ’ and a quantity of carbides. With the increase of exposure time, the coarsening of γ’ follows Ostwald ripening theory. During the whole thermal aging no eta and sigma phases are observed. Due to the different growth rate of γ’, room temperature microhardness increases to a maximum at the first 500 h to ~1000 h and then softening proceeds. However, the hardness decreases slowly with time from ~1000 h to 3000 h aging, which implies that superior properties can be maintained during long term service. The changes of microstructure and hardness indicate that both of In 740 H and HT1 have good phase stability.

关 键 词:先进超超临界(A-USC) Ni/Ni-Fe基高温合金 组织演变 显微硬度 

分 类 号:TG132[一般工业技术—材料科学与工程]

 

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