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<p>The present failure investigation pertains to the failure of U-bend of the reheater section of an 800&#xa0;MW supercritical coal fired power plant. The cracks were found on the intrados side and the neutral axis of the U-bend tube at approximately 64° from the center of the bend. The intrados side crack was circumferentially aligned, whereas the neutral axis crack was longitudinally aligned. Microstructural investigation revealed intergranular failure in both types of cracking. SEM–EBSD investigation revealed an extensive amount of strain accumulation near the grain boundaries and triple boundaries, for both the cases. As the nature of stresses was complicated, the Schmid Factor maps were able to help in determining the possible direction of stress wherein the activation of <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\left\{ {1\overline{1}1} \right\}\langle 10\overline{1}\rangle\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mfenced close="}" open="{"> <mrow> <mn>1</mn> <mover> <mn>1</mn> <mo>¯</mo> </mover> <mn>1</mn> </mrow> </mfenced> <mrow> <mo stretchy="false">⟨</mo> <mn>10</mn> <mover> <mn>1</mn> <mo>¯</mo> </mover> <mo stretchy="false">⟩</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> slip system was considered. Additionally, the presence of metallic filaments, intergranular nature of cracking and premature failure highlights strong evidence of stress relaxation cracking.</p>

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Failure Investigation of Intrados and Neutral Axis Cracking in TP347H Reheater Bend Tubes of an 800 MW Power Plant

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Aditya Gokhale,
  • Bushra Harun,
  • Chetan Singh,
  • T. P. Weihs,
  • Jayant Jain,
  • Anil Kumar Das,
  • Anand D. Varma

摘要

The present failure investigation pertains to the failure of U-bend of the reheater section of an 800 MW supercritical coal fired power plant. The cracks were found on the intrados side and the neutral axis of the U-bend tube at approximately 64° from the center of the bend. The intrados side crack was circumferentially aligned, whereas the neutral axis crack was longitudinally aligned. Microstructural investigation revealed intergranular failure in both types of cracking. SEM–EBSD investigation revealed an extensive amount of strain accumulation near the grain boundaries and triple boundaries, for both the cases. As the nature of stresses was complicated, the Schmid Factor maps were able to help in determining the possible direction of stress wherein the activation of \(\left\{ {1\overline{1}1} \right\}\langle 10\overline{1}\rangle\) 1 1 ¯ 1 ⟨ 10 1 ¯ ⟩ slip system was considered. Additionally, the presence of metallic filaments, intergranular nature of cracking and premature failure highlights strong evidence of stress relaxation cracking.