Gleeble模拟粉末直接锻造强化高硼不锈钢的颗粒变形和组织演变

IF 1.9 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Powder Metallurgy Pub Date : 2022-02-17 DOI:10.1080/00325899.2022.2040699

Xuan Zhou, Mingjia Wang

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引用次数: 0

摘要

在本工作中，首次提出了一种新方法，通过在1150°C和0.01-10 s−1下进行应变为32%和50%的热压缩试验，在Gleeble上实现高硼化不锈钢的直接粉末锻造。研究了高硼化不锈钢粉末在直接锻造过程中的颗粒变形和显微组织演变。采用背散射电子(BSE)和电子背散射衍射(EBSD)进行微观结构检测。显微组织显示，通过硼化物和晶粒特征可以很容易地区分出大变形区。接触区硼化物粗化的增强是应变、位错、应力和升温共同作用的结果。应变速率对致密化无明显影响，但对颗粒变形有显著影响。此外，还讨论了高应变速率增强颗粒变形的机理。

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Particle deformation and microstructural evolution of high borated stainless steel consolidated by Gleeble-simulated direct powder forging

ABSTRACT In the present work, a novel method was first proposed to realise direct powder forging of high borated stainless steel on Gleeble through hot compression tests performed at 1150°C and 0.01–10 s−1 with strains of 32% and 50%. Particle deformation and microstructural evolution of high borated stainless steel powder during direct forging were investigated. Backscattered electron (BSE) and electron backscatter diffraction (EBSD) were employed for microstructure examination. Microstructure reveals that large deformation zones were easily distinguished by boride and grain features. Enhanced boride coarsening in the contact area of powders was attributed to the combined action of strain, dislocation, stress and temperature rising. Strain rates had no obvious influence on densification but significantly affected the deformation of particles. Furthermore, the mechanism of particle deformation enhanced by a higher strain rate was discussed.

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来源期刊

Powder Metallurgy 工程技术-冶金工程

CiteScore

2.90

自引率

7.10%

发文量

审稿时长

3 months

期刊介绍： Powder Metallurgy is an international journal publishing peer-reviewed original research on the science and practice of powder metallurgy and particulate technology. Coverage includes metallic particulate materials, PM tool materials, hard materials, composites, and novel powder based materials.