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首页> 外文期刊>Materials Science and Engineering >Microstructure and mechanical properties of oxide dispersion strengthened 18Cr-ferritic steel consolidated by spark plasma sintering
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Microstructure and mechanical properties of oxide dispersion strengthened 18Cr-ferritic steel consolidated by spark plasma sintering

机译：火花等离子体烧结固结氧化物弥散强化的18Cr铁素体钢的组织和力学性能

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摘要

This paper presents the results of an experimental study on evolution of the nanocrystalline microstructure in a mechanically alloyed Oxide dispersion strengthened (ODS) 18Cr ferritic steel powder during densification by spark plasma sintering (SPS) in the temperature range of 1273 K (1000 °C) to 1423 K (1150 °C). Systematic Electron Back-Scatter Diffraction analysis has been carried out to study the grain size distribution and texture as a function of consolidation temperatures. Based on the kinetics of the densification process and resultant microstructure/microtexture, a sintering temperature slightly above 1323 K (1050 °C) within a range of 50 K was found to be optimum. The 18Cr-ferritic steel powder consolidated at 1323 K (1050 °C) was also studied to understand the role of dispersoids on microstructure. The dispersoids exerted a profound influence on the strength as well as toughness of the steel by restricting the grain growth at high temperatures. Further, a signature of (1 1 0) grain cluster is observed during consolidation and its preferential growth with increase in sintering temperature is noticed which lead to the alignment of the (1 1 0) plane in the direction of applied pressure. The minimum creep rate of the consolidated steel under a load of 300 MPa was found to be 5E-7 h−1and 1E-4 h−1at 873 and 973 K (600 and 700 °C) respectively. The apparent activation energy for creep deformation was estimated as ~ 402 kJ/mol, which is typical of lattice diffusion assisted general climb mechanism of dislocations over the barriers such as present dispersoids.
机译：本文介绍了在1273 K（1000°C）温度范围内通过火花等离子体烧结（SPS）进行机械合金化的氧化物弥散强化（ODS）18Cr铁素体钢粉在致密化过程中纳米晶组织演变的实验研究结果。至1423 K（1150 C）。已经进行了系统电子背散射衍射分析，以研究晶粒尺寸分布和织构随固结温度的变化。基于致密化过程的动力学和所得的微观结构/微观结构，发现在50 K范围内略高于1323 K（1050 C）的烧结温度是最佳的。还研究了在1323 K（1050 C）下固结的18Cr铁素体钢粉，以了解弥散体在微观组织中的作用。通过限制高温下的晶粒长大，分散质对钢的强度和韧性产生了深远的影响。此外，在固结过程中观察到（1 1 0）晶粒簇的特征，并且注意到其随烧结温度的升高而优先生长，这导致（1 1 0）平面在施加压力的方向上对齐。在873和973 K（600和700 C）下，在300 MPa载荷下，固结钢的最小蠕变速率分别为5E-7 h-1和1E-4 h-1。蠕变变形的表观活化能估计为〜402 kJ / mol，这是晶格扩散辅助的位错（如目前的弥散体）上方位错的一般爬升机制的典型特征。

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  • 来源
    《Materials Science and Engineering》 |2018年第24期|137-147|共11页
  • 作者

    Manmath Kumar Dash; R. Mythili; Rahul Ravi; T. Sakthivel; Arup Dasgupta; S. Saroja; Srinivasa Rao Bakshi;

  • 作者单位

    Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research,IGCAR, HBNI;

    Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research,IGCAR, HBNI;

    Indian Institute of Technology Madras;

    Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research,IGCAR, HBNI;

    Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research,IGCAR, HBNI;

    Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research,IGCAR, HBNI;

    Indian Institute of Technology Madras;

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  • 正文语种 eng
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  • 关键词

    Steel; Powder metallurgy; SPS; EBSD; Creep;

    机译：钢铁;粉末冶金;SPS;EBSD;蠕变;

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