本文研究了GH37镍基合金在静载荷下的裂纹扩展行为,试验温度范围为590—750℃.结果表明,在应力强度因子一定时,蠕变裂纹扩展速度(dα/dt)随温度升高而增加.低应力强度因子区域的dα/dt,在750℃时反而比730℃低,在真空中比空气中低.最后对断口形貌进行了仔细分析,并对蠕变裂纹扩展机制以及氧的影响进行了讨论.
The creep crack growth rate(CCGR)associated with the stress intensity factorin GH37 Ni-base superalloy was measured at temperature from 590 to 750℃ in airor vacuum.For a given stress intensity factor,the CCGR in air increases withthe increase of temperature up to 730℃.However,the CCGR at 750℃ is lessthan that at 730℃ in the region of lower stress intensity factor because of cracktip blurting caused by creep deformation.And the CCGR in air is higher than thatin vacuum owing to crack propagation accelerated by oxygen.The SEM examina-tion showed that the morphology of crack is of the intergranular mode at all testtemperatures.The creep crack propagation mechanism at high temperature has alsobeen discussed.
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