过温服役条件下GH3625合金的组织稳定性
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摘要
采用SEM、EDS、XRD、万能拉伸试验机等手段,研究了750℃时效不同时间对GH3625合金管材组织及力学性能的影响。结果表明:固溶态的GH3625合金在750℃时效1000h后主要析出MC、M_6C、M_(23)C_6、γ"、δ相。GH3625合金时效过程中的晶粒长大与晶界处相变行为以及Nb原子的溶质拖曳作用有密切的关系。固溶态的GH3625合金在750℃时效(0～1000h范围内)后晶界宽度呈现出先增后减的趋势。GH3625合金时效前后,抗拉强度变化并不明显,屈服强度呈现出持续升高的趋势,但是合金的伸长率损失了62.55%,断裂模式从延性断裂转变为脆性断裂。
The influence of different aging time at 750 ℃ on microstructure and mechanical properties of GH3625 alloy tube were investigated by OM, SEM, EDS, Universal Testing Machine, etc. The results show that the MC, M_6 C, M_(23)C_6, γ" and δ phase are mainly precipitated in the GH3625 alloy after aging at 750 ℃ for 1000 h. The grain growth in the aging process of GH3625 alloy is closely related to the phase transition behavior at the grain boundary and the solute drag of Nb atoms. Due to the transformation of different types of the phase at the grain boundaries,the grain boundaries width of the GH3625 alloy increases initially and then decreases during the long-term heat preservation at 750 ℃. Before and after aging, the change of tensile strength of the alloy is not obvious, and the yield strength shows a trend of increasing continuously.However, 62.55% of the elongation of the alloy has lost, and the fracture mode changes from ductile fracture to brittle fracture.
The influence of different aging time at 750 ℃ on microstructure and mechanical properties of GH3625 alloy tube were investigated by OM, SEM, EDS, Universal Testing Machine, etc. The results show that the MC, M_6 C, M_(23)C_6, γ" and δ phase are mainly precipitated in the GH3625 alloy after aging at 750 ℃ for 1000 h. The grain growth in the aging process of GH3625 alloy is closely related to the phase transition behavior at the grain boundary and the solute drag of Nb atoms. Due to the transformation of different types of the phase at the grain boundaries,the grain boundaries width of the GH3625 alloy increases initially and then decreases during the long-term heat preservation at 750 ℃. Before and after aging, the change of tensile strength of the alloy is not obvious, and the yield strength shows a trend of increasing continuously.However, 62.55% of the elongation of the alloy has lost, and the fracture mode changes from ductile fracture to brittle fracture.
引文
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[2]Thomas C,Tait P.International Journal of Pressure Vessels&Piping[J],1994,59(1-3):41
[3]Floreen S,Fuchs G E,Yang W J.The Minerals,Metals(5)Materials Society[J],1976(10):13
[4]Zhang Hongbin(张红斌).Special Steel Technology(特钢技术)[J],2000(3):69
[5]Guo Yan(郭岩),Hou Shufang(侯淑芳),Zhou Rongcan(周荣灿).Journal of Chinese Society of Power Engineering(动力工程学报)[J],2010,30(12):966
[6]Editorial board of China Aviation Materials Handbook(中国航空材料手册委员会).China Aeronautical Materials Handbook(中国航空材料手册)[M].Beijing:Standards Press of China,1989:198
[7]Ye Jun(冶军).American Nickel Base Superalloy(美国镍基高温合金)[M].Beijing:Science Press,1978
[8]Huang Jiancheng(黄健成),Yao Rungang(姚润钢),Yao Shangwei(姚上卫).Development and Application of Materials(材料开发与应用)[J],2016,31(1):87
[9]Shaikh M A,Ahmad M,Shoaib K A et al.Metal Science Journal[J],2000,16(2):129
[10]Mohr J C.Metallurgical&Materials Transactions A[J],1995,26(5):1273
[11]Suave L M,Cormier J,Villechaise P et al.Metallurgical&Materials Transactions A[J],2014,45(7):2963
[12]Moore I J,Taylor J I,Tracy M W et al.Materials Science&Engineering A[J],2016,682(1):402
[13]Chen Minghao(陈名浩),He Yinqiu(何银秋),Metallurgical Analysis(冶金分析)[J],1989(2):1
[14]Sundararaman M,Mukhopadhyay P,Banerjee S.Metallurgical Transactions A[J],1988,19(3):453
[15]Miao Weimin(毛卫民).Metal Recrystallization and Grain Growth(金属的再结晶与晶粒长大)[M].Beijing:Metallurgical Industry Press,1994:37
[16]Yang Gang(杨钢),Sun Lijun(孙利军),Zhang Lina(张丽娜)et al.Journal of Iron and Steel Research(钢铁研究)[J],2009,21(2):39
[17]Msi U.Fundamental of Materials Science[M].Springfield,VA:National Technical Information Service,U.S.Department of Commerce,2013:155
[18]Dash S,Brown N.Acta Metallurgica[J],1963,11(9):1067
[19]Li Yamin(李亚敏),Zhu Ruiming(朱瑞明),Liu Hongjun(刘洪军)et al.Heat Treatment of Metals(金属热处理)[J],2017,42(9):94
[20]Tawancy H M,Allam I M,Abbas N M.Journal of Materials Science Letters[J],1990,9(3):343
[21]Wang J,Zhou L,Sheng L et al.Materials(5)Design[J],2012,39:55
[22]Sun Wen(孙文),Qin Xuezhi(秦学智),Guo Jianting(郭建亭)et al.Acta Metallurgica Sinica(金属学报)[J],2016,52(4):455
[23]Dai Pengchao(代朋超),Wu Jing(吴静),Wang Zixing(王资兴).Baosteel Technology(宝钢技术)[J],2017(2):29
[24]Di Xinjie(邸新杰),Xing Xixue(邢希学),Wang Baosen(王宝森),Acta Metallurgica Sinica(金属学报)[J],2014,50(3):323
[25]Tian Sugui(田素贵),Wang Xin(王欣),Xie Jun(谢君)et al.Acta Metallurgica Sinica(金属学报)[J],2013,49(7):845
[26]Evans N D,Maziasz P J,Shingledecker J P et al.Materials Science&Engineering A[J],2008,498(1):412
[27]Jiang He(江河).Thesis for Doctorate(博士论文)[D].Beijing:University of Science and Technology Beijing,2017
[28]Oblak J M,Paulonis D F,Duvall D S.Metallurgical Transactions[J],1974,5(1):143
[29]Ding Yutian(丁雨田),Gao Yubi(高钰璧),Dou Zhengyi(豆正义)et al.Acta Metallurgica Sinica(金属学报)[J],2017,53(6):695
[30]Xie Xishan(谢锡善),Dong Jianxin(董建新),Fu Shuhong(付书红)et al.Acta Metallurgica Sinica(金属学报)[J],2010,46(11):1289
[31]Chakravartty J K,Singh J B,Sundararaman M.Materials Science&Technology[J],2013,28(6):702
[32]Tawancy H M,Allam I M,Abbas N M.Journal of Materials Science Letters[J],1990,9(3):343
[33]Suave L M,Cormier J,Villechaise P et al.Metallurgical&Materials Transactions A[J],2014,45(7):2963
[34]Liao Xiaohang(廖晓航),Si Jiayong(司家勇),Song Siyuan(宋思远)et al.Transactions of Materials and Heat Treatment(材料热处理学报)[J],2016,37(8):1
[35]Smith C S.Metals Technology[J],1948,175:15
[36]Hu Gengxiang(胡赓祥),Cai Xun(蔡珣),Rong Yonghua(戎咏华).Fundamentals of Materials Science(材料科学基础第3版)[M].Shanghai:Shanghai Jiaotong University Press,2010
[37]Zeng Qiang(曾强),Yan Ping(燕平),Shao Chong(邵冲)et al.Acta Metallurgica Sinica(金属学报)[J],2013,49(1):63
[38]Aust K T.Canadian Metallurgical Quarterly[J],1994,33(4):265
[39]Chu Youyi(褚幼义),Zhang Sanhong(章三红),He Xinlai(贺信莱)et al.Acta Metallurgica Sinica(金属学报)[J],1989(4):41
[40]Wu Ping(吴平),He Xinlai(贺信莱).Acta Metallurgica Sinica(金属学报)[J],1999(10):1009
[41]Li Yuqing(李玉清),Liu Jinyan(刘锦岩).Grain Boundary Interstitial Phase of Superalloy(高温合金晶界间隙相)[M].Beijing:Metallurgical Industry Press,1990:166
[42]Zhong Qunpeng(钟群鹏),Zhao Zihua(赵子华),Zhang Zheng(张峥).Journal of Mechanical Strength(机械强度)[J],2005,27(3):358
[43]Central Iron and Steel Research Institute,Ministry of Metallurgical Industry(冶金工业部钢铁研究院).Fracture Analysis Maps of Refractory Metals(难熔金属断口分析图谱)[M].Beijing:Science and Technology Press,1978
[44]Feng Di(冯滌),Zhao Minghan(赵明汉),Zhang Ji(张继).Fracture Analysis Maps of Superalloys(高温合金断口分析图谱)[M].Beijing:Metallurgical Industry Press,2006