Strain Hardening Behavior of Polygonal Ferrite and Acicular Ferrite Dual-phase Pipeline Steel

doi:10.11901/1005.3093.2021.196

Chinese Journal of Materials Research

2022, Vol. 36

Issue (8): 561-570 DOI: 10.11901/1005.3093.2021.196

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Strain Hardening Behavior of Polygonal Ferrite and Acicular Ferrite Dual-phase Pipeline Steel

XUN Yu¹^,², YAN Wei¹, SHI Xianbo¹(

), ZHANG Chuanguo³, SHAN Yiyin¹, YANG Ke¹, REN Yi⁴

^1.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, Hefei 230000, China
^3.Baosteel Central Research Institute, Shanghai 201900, China
^4.State Key Laboratory of Metal Materials and Application for Marine Equipment, Anshan 1140009, China

Cite this article:

XUN Yu, YAN Wei, SHI Xianbo, ZHANG Chuanguo, SHAN Yiyin, YANG Ke, REN Yi. Strain Hardening Behavior of Polygonal Ferrite and Acicular Ferrite Dual-phase Pipeline Steel. Chinese Journal of Materials Research, 2022, 36(8): 561-570.

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Abstract

Four polygonal ferrite/acicular ferrite (PF/AF) dual-phase steels with different volume fractions of polygonal ferrite were processed by heat treatment process. The effect of soft phase (polygonal ferrite) ratio on the effective grain size and geometrically necessary dislocation density (GND) was analyzed by electron backscattered diffraction (EBSD). While the relationship between stress ratio and strain hardening exponent (n), as well as the tensile deformation behavior and the relevant strain hardening mechanism of dual-phase pipeline steels of PF/AF dual-phase steels with different PF volume fractions were assessed by means of empirical formulas of the so called Hollomon analysis and modified C-J analysis. The results show that the strain hardening ability of PF/AF dual-phase steel is almost independent of stress ratio, while the strain hardening index has a specific linear relationship with the uniform elongation. With the increase of volume fraction of polygonal ferrite, the necking point moves backward and the strain hardening behavior changes from two-stage to three-stage process. The change of volume fraction of polygonal ferrite has a significant effect on the strain hardening ability of the first and second stages.

Key words: metallic materials polygonal ferrite/acicular ferrite (PF/AF) dual-phase steel volume fraction of polygonal ferrite modified C-J analysis strain hardening behavior

Received: 22 March 2021

ZTFLH:

TG430.40

Fund: National Key R & D Program of China(2018YFC0310300);State Key Laboratory of Metal Material for Marine Equipment and Application(SKLMEA-K201901);State Key Laboratory of Metal Material for Marine Equipment and Application(SKLMEA-K202002)

About author: SHI Xianbo, Tel: (024)83973136, E-mail: xbshi@imr.ac.cn

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	Yi REN

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.196 OR https://www.cjmr.org/EN/Y2022/V36/I8/561

Fig.1 Schematic diagram of heat treatment process

Fig.2 Microstructures of experimental steels after different heat treatment (a) 1#, (b) 2#, (c) 3#, (d) 4#

Fig.3 TEM micrographs of (a) AF in 1# steel and (b) PF in 4# steel

Fig.4 inverse pole figure (IPF) for 1# (a)、2# (b) and 4# (c) sample; Misorientation distribution maps of grain boundary for 1# (d)、2# (e) and 4# (f) sample; geometrically necessary dislocations (GND) densities for 1# (g)、2# (h) and 4# (i) sample; (j) the average grain size of 1#、2# and 4# sample; (k) the frequency of LAGBs and HAGBs at 1#、2# and 4# sample; (l) the frequency of GND at 1#、2# and 4# sample

Table 1 Mechanical properties of experimental steels

Fig.5 Engineering stress-strain curves of experimental steels

Fig.6 Effect of volume fraction of PF on engineering stress of experimental steels

Fig.7 Effect of volume fraction of PF on stress ratio and yield ratio of experimental steels

Fig.8 Relationships between yield ratio, stress ratio, elongation and strain hardening exponent of experimental steels (a) yield ratio vsn value; (b) stress ratio vsn value; (c) elongation vsn value

Fig.9 Hollomon analysis curves of experimental steels

Fig.10 True stress and work-hardening rate as a function of true strain

Fig.11 Modified C-J analysis curves of experimental steels

Table 3 Strain hardening capability of each stages and transition strain (ε_t) of experimental steel in modified C-J analysis

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