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B、P对超超临界燃煤发电机组汽轮机用高温合金GH2107组织和性能的影响
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沈阳理工大学材料科学与工程学院,沈阳理工大学材料科学与工程学院,中科院金属研究所,辽宁科技大学,中科院金属研究所,中科院金属研究所

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国家自然科学基金资助(项目号51001101/51172101)


EFFECTS OF B AND P ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A-USC GH2107 SUPERALLOY
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    摘要:

    研究了B、P对一种新型700℃超超临界燃煤发电汽轮机用镍铁基变形高温合金GH2107微观组织及力学性能的影响。结果表明:合金中的析出相主要为γ′相、M3B2硼化物、MC和M23C6碳化物。B抑制合金中M23C6的析出和长大,阻止晶界粗化,并通过提高晶界结合力和阻碍晶间裂纹萌生来强化合金。P促进M23C6析出和长大,助长晶界粗化,但是P能抑制裂纹在试样表面萌生和扩展,P原子团还会阻碍晶界滑动与位错滑移。室温下,B、P对晶界的强化作用较弱,晶界为薄弱区,而在高温下,B、P对晶界起到了很好的强化作用。当B含量过高时,将与P产生竞争偏析,降低合金的拉伸强度和持久寿命。

    Abstract:

    A new Ni-Fe based wrought superalloy for 700℃ advanced ultra-supercritical steam turbine rotor application was developed. The effects of B and P on the microstructure and mechanical properties of the alloy were investigated. The results show that the major precipitates in the alloy were γ′, MC, M23C6 and M3B2. B restrains the precipitation and growth of the M23C6, increasing the binding force of grain boundaries and obstacles intergranular crack initiation. P accelerates the precipitation and growth of the M23C6, and suppress crack initiation and propagation in the surface. B and P play an even more significant role in strengthening grain boundaries at 700 ℃ than at room temperature, they improve not only the strength but also the high-temperature ductility of the alloy. But However, high B content impairs the beneficial effect of P element. reducing the tensile strength and rupture life of the alloy.

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肖旋,杨成,秦学智,周艳文,郭建亭,周兰章. B、P对超超临界燃煤发电机组汽轮机用高温合金GH2107组织和性能的影响[J].稀有金属材料与工程,2017,46(4):1136~1142.[xiaoxuan, yangcheng, qinxuezhi, zhouyanwen, guojianting, zhoulanzhang. EFFECTS OF B AND P ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A-USC GH2107 SUPERALLOY[J]. Rare Metal Materials and Engineering,2017,46(4):1136~1142.]
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  • 收稿日期:2015-01-12
  • 最后修改日期:2015-11-04
  • 录用日期:2015-12-11
  • 在线发布日期: 2017-08-04
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