金属学报  1987, Vol. 23 Issue (5): 413-420

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涂盐热腐蚀环境中GH37合金的蠕变断裂

林栋樑;黄伟;张源虎

上海交通大学;上海交通大学;上海交通大学

CREEP RUPTURE BEHAVIOUR OF SALT-COATED SUPERALLOY GH37 IN A HOT ENVIRONMENT

by LIN Dongliang (T. L. Lin); HUANG Wei; ZHANG Yuanghu (Shanghai Jiaotong University)(Manuscript received 3 May; 1986; revised manuscript 28 July; 1986)

林栋樑;黄伟;张源虎. 涂盐热腐蚀环境中GH37合金的蠕变断裂[J]. 金属学报, 1987, 23(5): 413-420.
, , . CREEP RUPTURE BEHAVIOUR OF SALT-COATED SUPERALLOY GH37 IN A HOT ENVIRONMENT[J]. Acta Metall Sin, 1987, 23(5): 413-420.

摘要 参考文献 相关文章 Metrics 全文: PDF(2543 KB)   摘要: 本文研究了镍基形变高温合金GH37涂10％NaCl+90％Na_2SO_4混合盐后的蠕变断裂行为,并与空气环境进行了比较.试验结果表明,在700—850℃,196—510MPa试验条件下,涂盐使合金的蠕变寿命和塑性大幅度降低,但最小蠕变速率几乎不受影响;涂盐试样的蠕变激活能和应力敏感指数都与空气中相当,这说明热腐蚀并不改变合金的蠕变机制;在温度较高、应力较低(800℃、265MPa)时,晶粒越细则涂盐试样的蠕变寿命下降越严重;但在温度较低、应力很高(700℃、510MPa)时,晶粒尺寸适中的涂盐试样蠕变寿命最长.涂盐环境下蠕变寿命的降低是由于合金晶界受到贫Cr和硫化损害所致,贫Cr引起晶界上碳化物分解而降低晶界抗剪切强度.贫Cr和硫化导致晶界裂纹易于萌生并加速其扩展. Abstract：The creep rupture behaviour of a wrought Ni-base superalloy GH37, bared or coated by a mixture of 10% NaCl and 90% Na_2SO_4 (by wt), has been studied from exposure to air at temperature range of 700-850℃ under stress range of 196-509.6MPa. The creep rupture life and ductility of the salt-coated specimens are reduced dramatically, whereas the ε_(min) is hardly influenced. The hot corrosion does Hot change the creep mechanism since the creep activation energy and stress exponent obtained of coated specimens are nearly similar to the bared ones in air. In the hot corrosion envirnonment of a higher temperature and lower stress, saying, 800℃ and 264 MPa, the finer the grain size, the more severe the reduction of creep rupture life is, while at lower temperature and higher stress, saying, 700℃ and 509.6MPa, the creep rupture life of the alloy with intermediate grain size is longest. It seems that the Shortening of creep rupture life of salted specimen is due to the decomposition of carbides, depletion of Cr and sulphation at grain boundaries which lead to an increase of creep crack nucleation and growth rate 收稿日期: 1987-05-18      服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 林栋樑 黄伟 张源虎 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1987/V23/I5/413 1 Lin T L, Zhang Y H, Yang H W. Mater Sci Eng, 1984; 62: 17 2 Guo JT (郭建亭), Ranucci D, Picco E, Strocchi P M. In: Brunetaud R et at eds., High Temperature Alloys For Gas Turbines, Dordrecht R Neth: D. Reidel, 1982: 805 3 魏翔云,郝惠清,肖耀天.金属学报,1984;20:A365 4 吉蕖正行,宫川大诲,坂本庸晃,藤代大,铁钢,1982;68:120 5 Nicholls J R, Samnal J, Hurst R C, Hancock P. In: Kirman I et al eds., Behaviour of High Temperature Alloys in Aggressive Environment, Proc Pettern Int Conf, Londou: The Metal Soc, 1980: 911 6 Tien J K, Davidson J M. In: Fontana M G, Steahle R W eds., Corrosion Science and Technology, vol. 7, New york and London; Plenum, 1976: 1 7 张源虎,胡赓祥.机械工程材料,1985;9(1) :13 8 Mrowec S. In: Proc 8th Int Conf on Metallic Corrosion of Mainz, Frankfurt am Main: DECHEMA Deutsche Gesellschaft fur Chemisches Apparatewesen, 1981: 2110# No related articles found! Viewed Full text Abstract Cited   Shared      Discussed