研究了GH30镍基高温合金在静载荷下在1023K不同气氛中的蠕变裂纹扩展行为。结果表明:低应力强度因子区域,在10％SO_2+空气中的da/dt比空气中的高;高应力强度因子区域的da/dt,则与上述相反。对断口进行了分析,并讨论了蠕变裂纹扩展机制以及硫、氧的影响。
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.
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