原始粉末颗粒边界对FeCrAl合金冲击韧性的影响机理

doi:10.11896/cldb.20010098

材料导报

2021, Vol. 35

Issue (6): 6131-6134 https://doi.org/10.11896/cldb.20010098

金属与金属基复合材料

原始粉末颗粒边界对FeCrAl合金冲击韧性的影响机理

陈永庆¹, 闫英杰¹, 曹睿¹, 刘刚¹, 秦巍^2,3, 车洪艳^2,3, 王铁军^2,3

1 兰州理工大学,省部共建有色金属先进加工与再利用国家重点实验室,兰州 730050
2 中国钢研科技集团有限公司,安泰科技股份有限公司,北京 100081
3 河北省热等静压工程技术研究中心,涿州 072750

Mechanism of the Effect of Prior Particle Boundary on Impact Toughness of FeCrAl Alloy

CHEN Yongqing¹, YAN Yingjie¹, CAO Rui¹, LIU Gang¹, QIN Wei^2,3, CHE Hongyan^2,3, WANG Tiejun^2,3

1 State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology,Lanzhou 730050, China
2 Advanced Technology & Materials Limited Company, China Iron & Steel Research Institute Group, Beijing 100081, China
3 Engineering and Technology Research Center of Hot Isostatic Pressing, Zhuozhou 072750, China

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摘要粉末冶金制备的FeCrAl合金中存在的原始粉末颗粒边界对合金力学性能及断裂机制的影响目前尚不明确。本工作通过显微组织分析及扫描电镜原位拉伸试验,系统研究了FeCrAl合金中原始粉末颗粒边界对合金冲击韧性的影响机理。结果表明:粉末冶金制备的FeCrAl合金中原始粉末颗粒边界析出相主要为Nb的碳氮化物,在受力变形过程中,裂纹沿原始粉末颗粒边界处Nb的碳氮化物萌生并扩展,造成合金局部发生脆性沿晶断裂,从而导致粉末冶金制备的FeCrAl合金晶界强度较低、冲击韧性较差。

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	陈永庆
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	王铁军

关键词: FeCrAl合金原始粉末颗粒边界 Nb的碳氮化物冲击韧性原位拉伸

Abstract: The effect of prior particle boundary (PPB) in the FeCrAl alloy prepared by powder metallurgy on the impact toughness is undefined. Mechanism about the effect of PPB on the impact toughness of FeCrAl alloy was investigated by microstructure analysis and in-situ tensile test. The results showed that prior particle boundary precipitations were mainly niobium carbonitrides. During deformation, cracks initiation and propagation in niobium carbonitrides along prior particle boundaries and lead to partial intergranular fracture, low grain-boundary strength and brittle fracture of FeCrAl alloy prepared by powder metallurgy.

Key words: FeCrAl alloy prior particle boundary niobium carbonitrides impact toughness in-situ tensile test

出版日期: 2021-03-25 发布日期: 2021-03-23

ZTFLH:

TG142.1

基金资助: 国家自然科学基金(51961024;51761027)

通讯作者: yjyan@lut.edu.cn

作者简介: 陈永庆,2017年就读于兰州理工大学,师从曹睿教授和闫英杰副研究员,攻读硕士学位。主要研究方向为FeCrAl合金的制备及组织性能研究。
闫英杰,兰州理工大学副研究员。2015年于北京科技大学获得博士学位。主要从事材料强韧性方向的研究。于坤,新疆大学2017级硕士研究生,主要从事钛合金表面激光再制造和材料表面改性的研究。
祁文军,西南交通大学硕士,教授,主要从事材料加工领域中的数字化设计与应用。

引用本文:

陈永庆, 闫英杰, 曹睿, 刘刚, 秦巍, 车洪艳, 王铁军. 原始粉末颗粒边界对FeCrAl合金冲击韧性的影响机理[J]. 材料导报, 2021, 35(6): 6131-6134.
CHEN Yongqing, YAN Yingjie, CAO Rui, LIU Gang, QIN Wei, CHE Hongyan, WANG Tiejun. Mechanism of the Effect of Prior Particle Boundary on Impact Toughness of FeCrAl Alloy. Materials Reports, 2021, 35(6): 6131-6134.

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http://www.mater-rep.com/CN/10.11896/cldb.20010098 或 http://www.mater-rep.com/CN/Y2021/V35/I6/6131

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