<strong>FeCr-ODS</strong>铁素体合金的氧化<strong>+</strong>粉锻工艺制备及其微观结构

doi:10.11901/1005.3093.2021.150

材料研究学报

2022, Vol. 36

Issue (6): 461-470 DOI: 10.11901/1005.3093.2021.150

研究论文

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FeCr-ODS铁素体合金的氧化+粉锻工艺制备及其微观结构

闫福照¹^,², 李静¹, 熊良银¹, 刘实¹(

)

^1.中国科学院金属研究所师昌绪先进材料中心沈阳 110016
^2.中国科学技术大学材料科学与工程学院沈阳 110016

Preparation and Microstructure of FeCr-ODS Ferrite Alloy Fabricated by Oxidation and Powder Forging

YAN Fuzhao¹^,², LI Jing¹, XIONG Liangyin¹, LIU Shi¹(

)

^1.Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

引用本文:

闫福照, 李静, 熊良银, 刘实. FeCr-ODS铁素体合金的氧化+粉锻工艺制备及其微观结构[J]. 材料研究学报, 2022, 36(6): 461-470.
Fuzhao YAN, Jing LI, Liangyin XIONG, Shi LIU. Preparation and Microstructure of FeCr-ODS Ferrite Alloy Fabricated by Oxidation and Powder Forging[J]. Chinese Journal of Materials Research, 2022, 36(6): 461-470.

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摘要:

提出一种氧化+粉锻(粉末锻造)新工艺并用其制备了FeCr-ODS铁素体合金。使用SEM、XPS、EPMA和TEM等手段对其表征,研究了粉末表面和内部氧化物的生成、演变以及合金中纳米氧化物弥散相的种类和分布特征。结果表明,在低温氧化过程中粉末表面生成了一层Fe的氧化膜,在随后的加热过程中粉末表面的O元素转移并与Y和Ti元素反应生成了Y-Ti-O纳米氧化物弥散相。通过纳米氧化物弥散相在粉末成型过程中的演变,阐明了粉锻对位错和纳米氧化物析出相形成的贡献。用这种工艺制备的ODS铁素体合金,大量细小的Y₂TiO₅析出相均匀地分布在基体中,晶界上只有少量大颗粒Y₂O₃。

关键词 ：材料合成与加工工艺, FeCr-ODS铁素体合金, 粉锻, Y-Ti-O纳米颗粒, 形成机理, 微观组织

Abstract：

FeCr-ODS ferrite alloy was fabricated via a novel fabrication process of pre-oxidation treatment followed by powder forging proposed by the authors. The prepared alloy was characterized by means of SEM, XPS, EPMA and TEM techniques in terms of the generation, evolution of oxides on the surface and interior of the powder, as well as the type and distribution of oxide nanoparticles in the fabricated ODS ferrite alloy. The results show that an iron oxide film formed on the surface of powders during low temperature oxidation. By the subsequent heating process, the iron oxide could react with Y and Ti to form complex oxide Y-Ti-O nanoparticles. The evolution of oxide dispersoids during the course of fabrication was characterized to clarify the contribution of powder forging to dislocations and nanoscale precipitates. Fine Y₂TiO₅ nanoparticles uniformly distributed in the matrix, and a small number of Y₂O₃ particles aligned along the grain boundaries by this manufacturing method.

Key words： synthesizing and processing technics for materials FeCr-ODS ferrite alloy powder forging Y-Ti-O nanoparticles formation mechanism microstructure

收稿日期: 2021-02-25

ZTFLH:

TB331

基金资助:国防科技工业核材料技术创新中心项目(ICNM-2020-ZH-17);National Defense Science and Technology Industry Nuclear Material Technology Innovation Center Project(ICNM-2020-ZH-17)

作者简介: 闫福照,男,1992年生,博士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2021.150 或 https://www.cjmr.org/CN/Y2022/V36/I6/461

表1 雾化粉末的成分

图1 氧化粉末表面的SEM照片

表2 氧化粉末表面不同位置处的能谱

图2 氧化粉末截面上各元素的分布

图3 氧化粉末表面各元素随深度的分布

图4 氧化粉末表面各元素在不同溅射深度的高分辨XPS谱

图5 加热到1150℃粉末表面的SEM照片

表3 氧化粉末加热到1150℃后表面不同位置的能谱

图6 氧化粉末加热到1150℃后截面上各元素的分布

图7 氧化粉末加热到1150 ℃后表面各元素含量的XPS深度分析

图8 氧化粉末加热到1150℃后表面各元素在不同溅射深度的高分辨XPS谱

图9 粉锻成型后合金的金相照片

图10 合金内部的TEM照片

图11 合金中析出相与位错之间的关系

图12 合金中析出相的面扫描

图13 合金中析出相的结构

表4 小颗粒的面间距(d)和角度(α)以及对应析出相的结构

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