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Effect of temperature on tensile behavior of Ni-Cr-W based superalloy

机译：温度对Ni-Cr-W基高温合金拉伸性能的影响

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摘要

The temperature dependence of tensile behavior of Ni-Cr-W based superalloy has been studied by tensile tests in the temperature range of 25-900℃ The results indicated that the yield strength was anomaly with increasing temperature. Below 600℃, both the tensile and yield strength decreased slightly with increasing temperature; above 600℃, the tensile strength decreased rapidly while the yield strength almost kept invariable; the elongation had its minimum value at 600℃. Microstructure analysis showed that M_(23)C_6 carbides including of lamellar carbides (600℃) and discrete carbides (above 600℃) precipitated at the grain boundaries. The lamellar M_(23)C_6 carbides with the width of 1-3 μm weakened the strength of grain boundary, and thus led to the premature failure of the alloy. But the grain boundary sliding was effectively restricted by discrete M_(23)C_6 carbides. TEM analysis showed that the high dislocation density and cross-slip also contributed to the yield strength anomalous.
机译：通过在25-900℃温度范围内的拉伸试验研究了Ni-Cr-W基高温合金的拉伸行为与温度的关系。结果表明，屈服强度随温度的升高而反常。在600℃以下，拉伸强度和屈服强度均随温度的升高而略有下降。 600℃以上，抗拉强度迅速下降，而屈服强度几乎保持不变。伸长率在600℃达到最小值。显微组织分析表明，M_（23）C_6碳化物包括层状碳化物（600℃）和离散碳化物（600℃以上）沉淀在晶界。厚度为1-3μm的层状M_（23）C_6碳化物削弱了晶界强度，从而导致合金过早失效。但是晶界滑动受到离散的M_（23）C_6碳化物的有效限制。 TEM分析表明，高位错密度和交叉滑移也导致屈服强度异常。

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  • 来源
    《Materials Science and Engineering》 |2011年第5期|p.1974-1978|共5页
  • 作者

    Guanghai Bai; Jinshan Li; Rui Hu; Zengwu Tang; Xiangyi Xue; Hengzhi Fu;

  • 作者单位

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China;

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  • 关键词

    ni-cr-w based superalloy yield strength anomaly m_(23)c_(6) carbides tensile deformation;

    机译：Ni-Cr-W基高温合金屈服强度异常m_（23）c_（6）碳化物拉伸变形;

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