| 高钰璧,丁雨田,孟斌,马元俊,陈建军,许佳玉.δ相对Inconel625合金管材组织及性能的影响[J].稀有金属材料与工程,2019,48(4):1079~1086.[Gao Yubi,Ding Yutian,Meng Bin,Ma Yuanjun,Chen Jianjun,Xu Jiayu.The influence of δ phase on the microstructure and properties of Inconel 625 superalloy tubes[J].Rare Metal Materials and Engineering,2019,48(4):1079~1086.] |
| δ相对Inconel625合金管材组织及性能的影响 |
| 投稿时间：2017-10-18 修订日期：2018-01-12 |
| 中文关键词: Inconel 625合金 δ相 钉扎作用 溶质拖曳 组织性能 |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
| 中文摘要: |
| 本文在不改变Inconel 625合金成分的前提下,通过冷变形及时效处理来调控合金中δ相的含量、分布及形貌,以确保合金组织的稳定性及使用可靠性。通过室温压缩试验和时效处理,研究了冷变形对δ相的含量、分布及形貌影响和δ相对Inconel 625合金管材组织性能的影响。采用XRD、SEM和EDS表征δ相的特征。研究表明,随着冷变形的增加,合金的平均晶粒尺寸减小,晶粒变形均匀性逐渐变好,合金的硬度增加；冷变形促进了δ相的析出；随着冷变形量的增加,δ相首先在形变孪晶界、晶界及变形带上析出,随后在晶内析出,针状的δ相呈现近正交状或网格状分布在晶内,且在变形带上平行排列,同时,随着冷变形量的增加,δ相的形貌由针状转变为短棒状或颗粒状；合金的平均晶粒尺寸随着冷变形量的增加和保温时间的延长而减小；当冷变形量为35 %时,合金的硬度保温时间的延伸而增加,而冷变形量超过50 %时合金的硬度没有发生明显的变化。 |
| The influence of δ phase on the microstructure and properties of Inconel 625 superalloy tubes |
| 英文关键词:Inconel 625 superalloy δ phase precipitation pinning effect solute drag microstructure and properties |
| 英文摘要: |
| In this paper, the amount, distribution and morphology of δ phase in the alloy were controlled by cold deformation and aging treatment without changing chemical compositions of Inconel 625 superalloy to ensure the microstructure stability and performance reliability of the alloy. The influence of cold deformation (ε) on the amount, distribution and morphology of δ phase precipitation and the precipitation of δ phase on the microstructure and properties of Inconel 625 superalloy tubes are investigated by room temperature compression tests plus aging treatment. X-ray diffraction (XRD), scanning electron microscopy (SEM) and, energy dispersive spectrdmeter (EDS) is utilized to analyze the δ phase characteristics. It is found that with the increase of cold deformation (ε), the average grain size decreases and the deformation uniformity of the grain becomes better gradually, and the hardness increases. Cold deformation (ε) promotes precipitation of δ phase. With the increase of cold deformation (ε), the δ phase first precipitates at the deformation twin and grain boundaries as well as deformation bands, and then precipitates in the grains, the precipitation of δ needle phase were oriented in two near-orthogonal directions or a lattice-like distribution within the grain and the δ phase were oriented in two parallel directions at the deformation bands. At the same time, the morphologies of δ phase change gradually from needle to spheroid or short rodlike with increasing cold deformation (ε).The average grain size of the alloy reduces with the increase of cold deformation (ε) and the extension of aging time (t). The hardness of the alloy increases with the extension of aging time (t) at ε=35 %, however, the hardness of the alloy has no obvious change ε≥50 %. |
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