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<p>In this work, the evolution of tensile properties and associated deformation mechanisms of K439B alloy, which was subjected to long-term aging at 800&#xa0;°C for 10000&#xa0;h, were investigated. As the aging time was extended from 6000 to 10000&#xa0;h, the room temperature tensile properties of the alloy exhibited insignificant variation. The dislocation shearing and Orowan loops after 6000&#xa0;h aging and isolated stack faults shearing of γ′ precipitates after 10000&#xa0;h aging were dominant mechanisms. The fracture morphology displayed a mixed mode of transgranular, ductile intergranular, and brittle carbide cracking. For the samples tested at 800&#xa0;°C, a significant decrease in tensile strength was observed, accompanied by a notable enhancement in elongation compared to the standard heat treatment state. Stacking faults, which are restrained in γ′ emerged as the primary deformation mechanism in the high temperature tensile tests.</p>

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On the Room and High Temperature Tensile Properties of K439B Cast Superalloy during Long-Term Thermal Exposure at 800 °C

  • 期刊论文

  • 发表日期：

    2026年1月14日

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  • Yidong Wu,
  • Zhao Dong,
  • Xinghai Qu,
  • Lei Gao,
  • Wentong Liu,
  • Chengbo Xiao,
  • Jingyang Chen,
  • Xidong Hui

摘要

In this work, the evolution of tensile properties and associated deformation mechanisms of K439B alloy, which was subjected to long-term aging at 800 °C for 10000 h, were investigated. As the aging time was extended from 6000 to 10000 h, the room temperature tensile properties of the alloy exhibited insignificant variation. The dislocation shearing and Orowan loops after 6000 h aging and isolated stack faults shearing of γ′ precipitates after 10000 h aging were dominant mechanisms. The fracture morphology displayed a mixed mode of transgranular, ductile intergranular, and brittle carbide cracking. For the samples tested at 800 °C, a significant decrease in tensile strength was observed, accompanied by a notable enhancement in elongation compared to the standard heat treatment state. Stacking faults, which are restrained in γ′ emerged as the primary deformation mechanism in the high temperature tensile tests.