Discontinuous grain growth in an equal-channel angular pressing processed Fe-9Cr steel with a heterogeneous microstructure

被引:13
作者
Duan, Jiaqi [1 ]
Wen, Haiming [1 ,2 ]
Zhou, Caizhi [1 ]
He, Xiaoqing [3 ,4 ]
Islamgaliev, Rinat [5 ]
Valiev, Ruslan [5 ,6 ]
机构
[1] Missouri Univ Sci & Technol, Dept Mat Sci & Engn, Rolla, MO 65409 USA
[2] Missouri Univ Sci & Technol, Dept Ming & Nucl Engn, Rolla, MO 65409 USA
[3] Univ Missouri, Electron Microscopy Core Facil, Columbia, MO 65211 USA
[4] Univ Missouri, Dept Mech & Aerosp Engn, Columbia, MO 65211 USA
[5] Ufa State Aviat Tech Univ, Inst Phys Adv Mat, Ufa 450008, Russia
[6] St Petersburg State Univ, Univ Skiy Prospekt 28, St Petersburg 198504, Russia
基金
俄罗斯科学基金会;
关键词
ECAP; Microstructure; Grain growth; Textures; Steel; Thermal stability; SEVERE PLASTIC-DEFORMATION; CELLULAR MICROSTRUCTURES; UNIFIED THEORY; AL-ALLOY; TEXTURE; RECRYSTALLIZATION; STABILITY; RECOVERY; EXTRUSION; EVOLUTION;
D O I
10.1016/j.matchar.2019.110004
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A particle-containing Fe-9Cr steel was processed by six passes of equal-channel angular pressing (ECAP) using route Bc to produce an ultrafine-grained (UFG) microstructure with a heterogeneous distribution of high-angle boundaries (HABs) and low-angle boundaries (LABs). Annealing was carried out on the ECAP-processed Fe-9Cr from 500 to 700 degrees C, for up to 48 h. It was found that the UFG microstructure was stable up to 550 degrees C. Discontinuous grain growth was first observed in the sample annealed at 600 degrees C, accompanied by an increase in LAB fraction. The discontinuous grain growth became evident during high temperature annealing (650-700 degrees C), leading to a reduction in LAB fraction and a significant increase in grain size. Grain growth was the main reason for the decline in hardness. It is proposed that in the current heterogeneous microstructure, grain growth initially occurs in regions of dominantly HABs, and subsequently takes place in regions that mainly consist of LABs, thereby forming a bimodal microstructure. Textures of the annealed structure were shown to be similar to those of the ECAP processed structure. No differences in textures were found between abnormal grains and the matrix in the annealed structure in current case.
引用
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页数:9
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