EFFECT OF SULPHURIZING-OXIDIZING ENVIRONMENT ON CREEP CRACK GROWTH OF Ni-BASE SUPERALLOY GH30

Acta Metall Sin

1991, Vol. 27

Issue (4): 49-53 DOI:

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EFFECT OF SULPHURIZING-OXIDIZING ENVIRONMENT ON CREEP CRACK GROWTH OF Ni-BASE SUPERALLOY GH30

ZHANG Yuanhu;ZHANG Yun;HU Gengxiang Shanghai Jiaotong University

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ZHANG Yuanhu;ZHANG Yun;HU Gengxiang Shanghai Jiaotong University. EFFECT OF SULPHURIZING-OXIDIZING ENVIRONMENT ON CREEP CRACK GROWTH OF Ni-BASE SUPERALLOY GH30. Acta Metall Sin, 1991, 27(4): 49-53.

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Abstract An investigation was made on the creep crack growth behaviour understatic load at 1023 K for Ni-base superalloy GH30 exposed to air and air +10% SO_2.Results showed that in the region of low stress intensity factor, the creep crackgrowth rate is higher in air +10% SO_2 than in air only, while in the high region,it is reverse. The fractograph of specimens has been analyzed, and the mechanismof creep crack growth together with the influences of sulphur and oxygen has beendiscussed as well.

Key words: Ni-base superalloy creep crack growth environment

Received: 18 April 1991

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