Creep behaviors of MC carbide reinforced nickel based composite

Creep behaviors of MC carbide reinforced nickel based composite
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MC碳化物增强镍基复合材料的蠕变行为

DOI:
10.1016/j.msea.2019.04.010
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发表时间:
2019-05
影响因子:
6.4
通讯作者:
Sun Baode
Sun Baode
中科院分区:
材料科学1区
文献类型:
--
作者:
Wang Wei;Wang Rui;Dong Anping;Zhu Guoliang;Wang Donghong;Zhou Wenzhe;Pan Weitao;Shu Da;Sun Baode

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采用铸造法制备了IN718C合金和MC碳化物增强IN718C复合材料(MC/IN718C)。研究了两种材料的蠕变行为。MC/IN718C复合材料在704 °C和620 MPa下的稳态蠕变速率降低了一个数量级。MC/IN718C复合材料抗蠕变性能的提高不是由应力指数和蠕变活化能的增加引起的。利用原位同步高能x射线衍射对MC/IN781C复合材料在拉伸载荷下的载荷分配进行了定量研究,发现MC颗粒的承载作用对MC/IN718C复合材料的抗蠕变性能的提高起着重要的作用,降低了基体的应力,减缓了基体的蠕变,延缓了MC/IN718C复合材料的失效。
IN718C alloy and MC carbide reinforced IN718C composites (MC/IN718C) were prepared by casting. Creep behaviors of the two materials were studied. The steady-state creep rate of the MC/IN718C composite at 704 °C under 620 MPa was reduced by an order of magnitude. The higher creep resistance for the MC/IN718C composite was not caused by the increase in the stress exponent or the creep activation energy. Based on the quantitative research of load partitioning in the MC/IN781C composite by usingin situsynchrotron high energy X-ray diffraction under tensile loading, it was found the load bearing effect of the MC particles played an important role in the creep resistance improvement of MC/IN718C composite, which reduced the stress on the matrix, slowed down the creep of the matrix, and delayed the failure of the MC/IN718C composite.
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