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| EFFECT OF SALTS ON CREEP BEHAVIOUR OF Ni-BASE ALLOY GH37 |
| CAO Mingzhou QIN Rongshi ZHAO Jixiang (Institute of Metal Research.Academia Sinica.Shenyang) |
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Cite this article:
CAO Mingzhou QIN Rongshi ZHAO Jixiang (Institute of Metal Research.Academia Sinica.Shenyang). EFFECT OF SALTS ON CREEP BEHAVIOUR OF Ni-BASE ALLOY GH37. Acta Metall Sin, 1987, 23(1): 70-75.
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Abstract The creep fracture behaviour of Ni-base alloy GH37 sustained under various loads was studied in three salt depositions:Na_2SO_4,10% NaCl+90% Na_2SO_4 or 20% NaCl+80% Na_2SO_4 at 750—850℃.No remarkable attack was observed in either Na_2SO_4 or 10% NaCl+90% Na_2SO_4,but a violent reduction in life of creep rupture and in creep elongation was expected while in 20% NaCl+80% Na_2SO_4 deposited at rate up to 3 mg/cm~2.The deposition of mixed salts 20% NaCl+80% Na_2SO_4 may destroy the protective oxide film on the alloy surface,meanwhile, may also erode evenly both surface and grain boundaries,and a Cr-depleted layer and intergrartular crackings under stress may be resulted.Therefore,the period of second stage creep is much shortened by interaction of the intergranular crack- ing at surface layer together with internal creep,and the alloy fails prematurely.
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Received: 18 January 1987
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1 Segueira C A,Hocking M G.Corrosion,1981;37:392
2 郭建亭.能源材料通讯,1983;(1) :34
3 姜晓霞.冶金标准化,1983;(2) :34 |
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