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Cyclic Oxiation of P91 at 1073, 1123 and 1173 K

机译：P91在1073、1123和1173 K下的循环氧化

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摘要

Cyclic oxidation behaviour of modified 9Cr-lMo steel has been investigated under three temperatures or 1073, 1123 and 1173 K. The adherence characteristics of the scale were studied by the 'transient mass gain' method by employing a thermogravimetric balance. A cycle time of 7.2 ks (2 h) was employed and at each temperature the specimen was oxidised for 360 ks (100 h, 50 cycles). Experiments revealed that the scale is mostly adherent in an isothermal condition. However, on cooling, the thermal expansion differential between the oxide scale and the parent alloy caused the development of cracks leading to spallation. The threshold thickness of the scale for the initiation of cracks and spallation was evaluated. Post-oxidation examinations were carried out by using XRD, SEM and EDS. Oxides of the type Fe_2O_3, FeCr_2O_4 were predominant at the surface at 1123 and 1173 K. At the relatively lower temperature of 1073 K, in addition to the above oxides, the scale also contained Cr_2O_3. The interspace of the oxide/alloy also contained significant amounts of oxide of chromium. The reason for such distribution of oxide phases has been explained by invoking thermodynamic and diffusion concepts.
机译：在1073、1123和1173 K的三个温度下研究了改性9Cr-1Mo钢的循环氧化行为。通过“瞬时质量增加”方法，采用热重平衡法研究了氧化皮的附着特性。使用7.2 ks（2 h）的循环时间，在每个温度下，将样品氧化360 ks（100 h，50个循环）。实验表明，水垢主要在等温条件下粘附。然而，在冷却时，氧化皮和母合金之间的热膨胀差导致裂纹的发展，导致剥落。评估了产生裂纹和剥落的鳞片的阈值厚度。使用XRD，SEM和EDS进行后氧化检查。 Fe_2O_3，FeCr_2O_4类型的氧化物主要存在于表面1123和1173K。在相对较低的温度1073 K下，除上述氧化物外，氧化皮还含有Cr_2O_3。氧化物/合金的空隙还包含大量的铬氧化物。通过调用热力学和扩散原理已经解释了氧化物相分布的原因。

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  • 来源
    《High temperature materials and processes》 |2004年第3期|p.195-204|共10页
  • 作者

    S. Rajendran Pilial; P. Sankar; H.S. Khatak;

  • 作者单位

    Corrosion Science and Technology Division, # Physical Metallurgy Section Materials Characterization Group, Indira Gandhi Centre for Atomic Research Kalpakkam, Tamil Nadu, India-603 102;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 金属学与热处理;
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