The role of δ phase for fatigue crack propagation behavior in a Ni base superalloy at room temperature

The role of δ phase for fatigue crack propagation behavior in a Ni base superalloy at room temperature
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δ 相对室温镍基高温合金疲劳裂纹扩展行为的作用

DOI:
10.1016/j.msea.2016.12.029
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发表时间:
2017-01
期刊:
Materials Science and Engineering A
影响因子:
--
通讯作者:
Xiu Song
Xiu Song
中科院分区:
其他
文献类型:
--
作者:
Jinlan An;Lei Wang;Yang Liu;Wenliang Cai;Xiu Song

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研究了不同δ相体积分数的镍基高温合金的室温疲劳裂纹扩展行为。结果表明,随着δ相体积分数的增加,合金的疲劳裂纹扩展速率增大,而疲劳裂纹扩展阻力和强度均降低。δ相对裂纹扩展行为的影响主要取决于δ相颗粒的低长径比对位错滑移的阻挡作用。另一方面,长针状δ相周围易产生位错堆积,导致应力集中。这种应力集中导致δ相从基体中剥离,并使裂纹易于沿无析出相区(PFZ)周围的长针状δ相沿着扩展。
The fatigue crack propagation behavior of a Ni base superalloy at room temperature with various volume fractions of δ phase was investigated. The result shows that fatigue crack growth rate of the alloy increases as δ phase volume fraction increases, while both the fatigue crack propagation resistance and the strength of the alloy decrease. The characteristic of δ phase on crack propagation behavior is depended on the dislocations slipping blocked by granular δ phase with low length-diameter radio. On the other hand, dislocations easily piled up around long needle-like δ phase which leads to stress concentration. This stress concentration causes δ phase debonding from the matrix and helps the crack easy propagates along long needle-like δ phase surrounded by precipitates free zone (PFZ).
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