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<p>The creep behaviour of Alloy 690 has been studied in a borosilicate glass environment using hollow cylindrical samples, at temperatures ranging from 800 to 1000&#xa0;°C under constant load conditions of applied stresses between 16 and 56&#xa0;MPa. This study aims to elucidate the role of borosilicate glass on&#xa0;the creep deformation behaviour of Alloy 690. The highly corrosive nature of molten borosilicate glass was found to significantly reduce the creep life (<i>t</i><sub><i>f</i></sub>) of Alloy 690 by approximately one-third and to double the minimum creep rate (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\dot{{\varepsilon }_{m}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mover accent="true"> <msub> <mi>ε</mi> <mi>m</mi> </msub> <mo>˙</mo> </mover> </math></EquationSource> </InlineEquation>), compared to similar tests conducted in air. The degradation of creep properties observed in the molten borosilicate glass environment was attributed to stress-assisted grain boundary oxidation, which primarily accelerated the initiation and propagation of surface cracks. A relatively low activation energy (~ 223&#xa0;kJ/mol) in the present study, suggested minimal role of Cr<sub>23</sub>C<sub>6</sub>carbides precipitation on creep deformation. Alloy 690 exhibited power-law creep behaviour under the tested conditions, emphasizing the role of climb-assisted dislocation creep. Furthermore, the creep data in the molten glass environment was found to conform to both the Monkman–Grant and Larson–Miller relationships.</p>

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Effect of borosilicate glass environment on creep behaviour of alloy 690 at temperatures over 800–1000 °C

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月20日

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  • M. Karri,
  • A. Verma,
  • J. B. Singh,
  • C. V. Singh

摘要

The creep behaviour of Alloy 690 has been studied in a borosilicate glass environment using hollow cylindrical samples, at temperatures ranging from 800 to 1000 °C under constant load conditions of applied stresses between 16 and 56 MPa. This study aims to elucidate the role of borosilicate glass on the creep deformation behaviour of Alloy 690. The highly corrosive nature of molten borosilicate glass was found to significantly reduce the creep life (tf) of Alloy 690 by approximately one-third and to double the minimum creep rate ( \(\dot{{\varepsilon }_{m}}\) ε m ˙ ), compared to similar tests conducted in air. The degradation of creep properties observed in the molten borosilicate glass environment was attributed to stress-assisted grain boundary oxidation, which primarily accelerated the initiation and propagation of surface cracks. A relatively low activation energy (~ 223 kJ/mol) in the present study, suggested minimal role of Cr23C6carbides precipitation on creep deformation. Alloy 690 exhibited power-law creep behaviour under the tested conditions, emphasizing the role of climb-assisted dislocation creep. Furthermore, the creep data in the molten glass environment was found to conform to both the Monkman–Grant and Larson–Miller relationships.