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<p>The process of formation of the structure and properties in billets from heat-resistant nickel alloy EP741NP obtained by hot isostatic pressing (HIP) and the effect of heat treatment (HT) on its characteristics are studied. It is established that the post-HIP billets contain pores and their volume fraction is distributed nonuniformly over cross section. A digital analysis of the microstructure of the material at the periphery and in the center of the billet is used to determine the grain sizes and their anisotropy. The basic mechanical characteristics of the EP741NP alloy after the HIP and the subsequent HT (hardening and three-stage aging) are studied in the temperature range of 20 – 900°C. It is shown that the HT raises the strength characteristics of the EP741NP alloy in the whole of the temperature interval of the tests. The variation of the hardness and of the elastic and shear moduli (<i>E</i> and <i>G</i>) over cross section of the billets is determined after the HIP and subsequent HT.</p>

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Study of the Structure and Properties of Billets from Alloy EP741NP Obtained by Hot Isostatic Pressing

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • A. A. Khlybov,
  • D. A. Ryabov,
  • A. A. Solov’ev,
  • A. A. Shuyanova,
  • A. A. Demchenko

摘要

The process of formation of the structure and properties in billets from heat-resistant nickel alloy EP741NP obtained by hot isostatic pressing (HIP) and the effect of heat treatment (HT) on its characteristics are studied. It is established that the post-HIP billets contain pores and their volume fraction is distributed nonuniformly over cross section. A digital analysis of the microstructure of the material at the periphery and in the center of the billet is used to determine the grain sizes and their anisotropy. The basic mechanical characteristics of the EP741NP alloy after the HIP and the subsequent HT (hardening and three-stage aging) are studied in the temperature range of 20 – 900°C. It is shown that the HT raises the strength characteristics of the EP741NP alloy in the whole of the temperature interval of the tests. The variation of the hardness and of the elastic and shear moduli (E and G) over cross section of the billets is determined after the HIP and subsequent HT.