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金属学报  2022, Vol. 58 Issue (2): 184-192    DOI: 10.11900/0412.1961.2021.00099
  研究论文 本期目录 | 过刊浏览 |
超高压烧结制备14Cr-ODS钢及微观组织与力学性能
王韬1, 龙弟均2, 余黎明1(), 刘永长1, 李会军1, 王祖敏1
1.天津大学 材料科学与工程学院 水利工程仿真与安全国家重点实验室 天津 300354
2.中国核动力研究设计院 成都 610041
Microstructure and Mechanical Properties of 14Cr-ODS Steel Fabricated by Ultra-High Pressure Sintering
WANG Tao1, LONG Dijun2, YU Liming1(), LIU Yongchang1, LI Huijun1, WANG Zumin1
1.State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Materials Science and Engineering, Tianjin University, Tianjin 300354, China
2.Nuclear Power Institute of China, Chengdu 610041, China
全文: PDF(3154 KB)   HTML
摘要: 

采用吉帕级超高压烧结粉末冶金方法制备了14Cr-ODS钢,通过致密度、SEM、TEM、硬度以及拉伸实验等方法研究了高压烧结工艺对ODS钢微观组织及力学性能的影响。研究表明,通过高压烧结可获得主要析出相为Ti2O3、晶粒均匀、平均晶粒尺寸小于300 nm的细晶14Cr-ODS钢,其Vickers硬度可达604 HV,抗拉强度接近1.5 GPa,显著优于常规烧结方法制备的相近成分ODS钢的性能。得益于超高压力产生塑性变形对晶粒形核和原子扩散的综合影响,超高压烧结可在较低烧结温度和较短烧结时间的工艺下,获得致密度超过99%的力学性能优异的ODS钢试样。

关键词 超高压烧结14Cr-ODS钢细小晶粒高硬度高强度    
Abstract

Due to its superior mechanical, processing, and service properties, oxide dispersion-strengthened (ODS) alloy (particularly Fe base ODS steel) has emerged as the most promising future candidate for advanced reactor structural materials. However, there are some problems with hot isostatic pressing sintering ODS steels, such as higher sintering temperature, longer sintering time, and relatively coarse grains. In this work, 14Cr-ODS steels were prepared by ultra-high pressure sintering with a sintering pressure of 3, 4, and 5 GPa, respectively. The microstructure and mechanical properties of the ultra-high pressure sintered 14Cr-ODS steel samples were characterized by density test, SEM, TEM, hardness test, and tensile test. Based on the contrast analysis of microstructure and mechanical properties, the effect of sintering pressure on the microstructure and mechanical properties of ultra-high pressure sintered 14Cr-ODS steel was investigated, and the effect mechanism was thoroughly analyzed. Analysis results show that the main oxide precipitate of ultra-high pressure sintered 14Cr-ODS steel is Ti2O3, and the average grain size of 14Cr-ODS steel prepared by ultra-high pressure sintering is less than 300 nm, which is approximately 5% of the average grain size of 14Cr-ODS steel prepared by conventional hot isostatic pressing sintering. The average grain size of samples prepared by ultra-high pressure sintering decreased initially and then increased as sintering pressure increased. The Vickers hardness of ODS steel samples sintered at 4 GPa can reach 604 HV, and the tensile strength is approximately 1.5 GPa, which is 1.6 times than that of 14Cr-ODS steel samples with a similar composition prepared by conventional hot isostatic pressing sintering. Ultra-high pressure sintered 14Cr-ODS steel with good sintering formability and a density greater than 99% can be obtained at lower sintering temperatures and shorter sintering times. Its excellent performance can be mainly associated with the comprehensive influence of the plastic deformation effect produced by ultra-high pressure sintering on grain nucleation and atom diffusion in sintered samples.

Key wordsultra-high pressure sintering    14Cr-ODS steel    fine grain    high hardness    high strength
收稿日期: 2021-03-03     
ZTFLH:  TG142.1  
基金资助:国家重点研发计划项目(2017YFB0701801);国家自然科学基金项目(51974199)
通讯作者: 余黎明     E-mail: lmyu@tju.edu.cn
Corresponding author: YU Liming     E-mail: lmyu@tju.edu.cn
作者简介: 王 韬,男,1996年生,硕士生

引用本文:

王韬, 龙弟均, 余黎明, 刘永长, 李会军, 王祖敏. 超高压烧结制备14Cr-ODS钢及微观组织与力学性能[J]. 金属学报, 2022, 58(2): 184-192.
Tao WANG, Dijun LONG, Liming YU, Yongchang LIU, Huijun LI, Zumin WANG. Microstructure and Mechanical Properties of 14Cr-ODS Steel Fabricated by Ultra-High Pressure Sintering[J]. Acta Metall Sin, 2022, 58(2): 184-192.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2021.00099      或      https://www.ams.org.cn/CN/Y2022/V58/I2/184

图1  机械合金化粉末的SEM像及其粒径分布
图2  烧结压力为3、4和5 GPa的超高压烧结14Cr-ODS试样的SEM像及其晶粒尺寸分布
图3  烧结压力为3、4和5 GPa的超高压烧结14Cr-ODS试样微观组织的TEM像
图4  烧结压力为4 GPa的超高压烧结14Cr-ODS试样析出颗粒的TEM像、EDS结果以及SAED花样
图5  烧结压力分别为3、4和5 GPa的14Cr-ODS烧结试样的拉伸曲线
图6  烧结压力为3、4和5 GPa的超高压烧结14Cr-ODS试样拉伸断口的SEM像
Initial pair1NN2NN
configuration
Ref. [33]Ref. [34]Ref. [33]Ref. [34]
Ysub + Ysub0.200.2100.02
Ysub + Tisub0.280.320.150.15
Tisub + Tisub0.290.320.150.16
Ysub + Osub-0.33-0.30-0.30-0.28
Tisub + Osub0.820.881.691.73
Oint + Tisub-0.27-0.21-0.55-0.50
Oint + Ysub0.280.33-0.85-0.80
Oint + Osub-1.29-1.210.190.26
Osub + Osub2.032.10--
Oint + Oint0.400.46--
表1  bcc结构Fe中各种可能的成对构型的形成能[33,34] (eV)
Element800oC[35]1150oC[32]
Y2.8 × 10-202.9 × 10-17
Ti2.5 × 10-153.7 × 10-13
O5.7 × 10-131.5 × 10-10
表2  bcc结构Fe中原子的扩散系数[32,35] (m-2·s-1)
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