Haynes282合金在长期时效和持久过程中的组织稳定性  

Microstructure Stability of Haynes282 Alloy During Long-term Aging and Creep-rupture Tests

作　　者：符锐[1] 赵双群[1] 

机构地区：[1]上海发电设备成套设计研究院,上海200240

出　　处：《动力工程学报》2017年第6期501-507,共7页Journal of Chinese Society of Power Engineering

摘　　要：分别在700℃、760℃、800℃下对Haynes282合金进行长达10 000h的时效试验,在700~850℃、80~520 MPa的范围内对合金进行持久试验,采用扫描电子显微镜、能谱仪和透射电子显微镜观察和分析了合金的显微组织,研究了合金在高温时效和持久过程中的组织稳定性.结果表明:当Haynes282合金在760℃以下温度时效时,其γ′相长大较慢,在800℃下时效时,γ′相长大较快;在700℃、760℃、800℃下,时效时间超过1 000h后,冲击性能均下降较快;在800℃长期时效及850℃持久试验过程中,晶界和晶内会析出针状或长条状富Mo的μ相,且发生MC碳化物退化.For the Haynes282 alloy, aging tests were conducted at 700 ℃, 760 ℃ and 800 ℃ for 10 000 h, respectively, while creep-rupture tests were carried out at 700-850 ℃ and at 80-520 MPa, so as to study the microstructure stability during above tests by the way of scanning electron microscopy, energy dispersive spectrometer and transmission electron microscopy. Results show that the γ＇ phase in Haynes282 alloy grows slowly at the aging temperature of 760 ℃, which grows rapidly at 800℃. After being aged at 700 ℃, 760℃ and 800℃ for more than 1 000 h, the impact energy lowers quickly. During long-term aging at 800℃ and creep-rupture test at 850 ℃, molybdenum-rich μ phase and degenerated MC carbide precipitate at grain boundaries and within grains of Hayness282 alloy.

关 键 词：Haynes282合金 时效试验 持久试验 组织稳定性 

分 类 号：TG132.3[一般工业技术—材料科学与工程]