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首页> 外文期刊>Materials Science and Engineering >Effect of phase separation on tensile and Charpy impact properties of MA956 ODS steel
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Effect of phase separation on tensile and Charpy impact properties of MA956 ODS steel

机译：相分离对MA956 ODS钢拉伸和夏比冲击性能的影响

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摘要

Tensile and Charpy tests were carried out to investigate the effect of phase separation on the mechanical properties of MA956 oxide dispersion strengthened high chromium steel. The ferritic matrix of the investigated material separates into Fe-rich α and Cr-rich α' phases during thermal ageing at 475 ℃. The yield stress and tensile strength increased in the aged material due to the formation of the nanometric sized precipitates while the ductility was decreasing with ageing time. The effect of Cr-rich precipitates on the strengthening was estimated using analytical models based on different mechanisms. Modulus strengthening can be considered the most important contribution to the yield strength increase. Charpy properties showed orientation dependence reflecting the anisotropy in the microstructure. The thermally aged MA956 alloy exhibited inferior Charpy impact properties compared to the as-received material. After ageing for 1000 h the ductile-brittle transition temperature (DBTT) was shifted by 200 ℃ to higher temperatures, while the upper shelf energy decreased dramatically. In samples with L-R orientation, crack arrester type delamination was observed which is considered to increase the upper shelf energy as compared to the other orientations.
机译：进行了拉伸和夏比试验，以研究相分离对MA956氧化物弥散强化高铬钢力学性能的影响。在475℃的热时效过程中，被研究材料的铁素体基体分离为富铁α和富铬α'相。时效材料的屈服应力和拉伸强度由于纳米级析出物的形成而增加，而延展性随时效时间降低。使用基于不同机理的分析模型估算了富铬沉淀物对强化的影响。模量增强可以被认为是屈服强度增加的最重要的贡献。夏比性质显示出取向依赖性，反映了微观结构中的各向异性。与原样相比，经过热时效处理的MA956合金表现出较差的夏比冲击性能。老化1000 h后，韧性-脆性转变温度（DBTT）升高了200℃，而上部储能急剧下降。在具有L-R取向的样品中，观察到了裂纹消除器类型的分层，这被认为与其他取向相比增加了上层搁板的能量。

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  • 来源
    《Materials Science and Engineering》 |2017年第17期|425-437|共13页
  • 作者

    Z. Szaraz; P. Haehner; J. Straska; S. Ripplinger;

  • 作者单位

    European Commission, Joint Research Centre, Directorate C - Nuclear Safety and Security, P.O. Box 2, 1755 ZG Petten, The Netherlands;

    European Commission, Joint Research Centre, Directorate C - Nuclear Safety and Security, P.O. Box 2, 1755 ZG Petten, The Netherlands;

    Department of Physics of Materials, Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 5, 121 16, Czech Republic;

    European Commission, Joint Research Centre, Directorate C - Nuclear Safety and Security, P.O. Box 2, 1755 ZG Petten, The Netherlands;

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  • 正文语种 eng
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  • 关键词

    Oxide dispersion strengthened alloy; Embrittlement; Charpy impact test; DBTT; Anisotropy;

    机译：氧化物弥散强化合金;脆化夏比冲击试验;DBTT;各向异性;

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