Effect of Bainite to Ferrite Yield Strength Ratio on the Deformability of Mesostructures for Ferrite/Bainite Dual-Phase Steels
The strength and plasticity balance of F/B dual-phase X80 pipeline steels strongly depends on deformation compatibility between the soft phase of ferrite and the hard phase of bainite; thus, the tensile strength of ferrite and bainite, as non-negligible factors affecting the deformation compatibilit...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-09-01
|
| Series: | Materials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1944/14/18/5352 |
| _version_ | 1797518358599434240 |
|---|---|
| author | Gui-Ying Qiao Zhong-Tao Zhao Xian-Bo Shi Yi-Yin Shan Yu Gu Fu-Ren Xiao |
| author_facet | Gui-Ying Qiao Zhong-Tao Zhao Xian-Bo Shi Yi-Yin Shan Yu Gu Fu-Ren Xiao |
| author_sort | Gui-Ying Qiao |
| collection | DOAJ |
| description | The strength and plasticity balance of F/B dual-phase X80 pipeline steels strongly depends on deformation compatibility between the soft phase of ferrite and the hard phase of bainite; thus, the tensile strength of ferrite and bainite, as non-negligible factors affecting the deformation compatibility, should be considered first. In this purely theoretical paper, an abstract representative volume elements (RVE) model was developed, based on the mesostructure of an F/B dual-phase X80 pipeline steel. The effect of the yield strength difference between bainite and ferrite on tensile properties and the strain hardening behaviors of the mesostructure was studied. The results show that deformation first occurs in ferrite, and strain and stress localize in ferrite prior to bainite. In the modified Crussard-Jaoul (C-J) analysis, as the yield strength ratio of bainite to ferrite (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>σ</mi><mrow><mi>y</mi><mo>,</mo><mi>B</mi></mrow></msub><mo>/</mo><msub><mi>σ</mi><mrow><mi>y</mi><mo>,</mo><mi>F</mi></mrow></msub></mrow></semantics></math></inline-formula>) increases, the transition strain associated with the deformation transformation from ferrite soft phase deformation to uniform deformation of ferrite and bainite increases. Meanwhile, as the uncoordinated deformation of ferrite and bainite is enhanced, the strain localization factor (SLF) increases, especially the local strain concentration. Consequently, the yield, tensile strength, and yield ratio (yield strength/tensile strength) increase with the increase in <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>σ</mi><mrow><mi>y</mi><mo>,</mo><mi>B</mi></mrow></msub><mo>/</mo><msub><mi>σ</mi><mrow><mi>y</mi><mo>,</mo><mi>F</mi></mrow></msub></mrow></semantics></math></inline-formula>. Inversely, the strain hardening exponent and uniform elongation decrease. |
| first_indexed | 2024-03-10T07:28:47Z |
| format | Article |
| id | doaj.art-2b3af9b1eae94bdb8194e7ceb7c748c0 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T07:28:47Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-2b3af9b1eae94bdb8194e7ceb7c748c02023-11-22T14:02:44ZengMDPI AGMaterials1996-19442021-09-011418535210.3390/ma14185352Effect of Bainite to Ferrite Yield Strength Ratio on the Deformability of Mesostructures for Ferrite/Bainite Dual-Phase SteelsGui-Ying Qiao0Zhong-Tao Zhao1Xian-Bo Shi2Yi-Yin Shan3Yu Gu4Fu-Ren Xiao5Key Lab of Applied Chemistry of Hebei Province, School of Environment and Chemical Engineering, Yanshan University, Qinhuangdao 066004, ChinaKey Lab of Metastable Materials Science&Technology, Hebei Key Lab for Optimizing Metal Product Technology and Performance, College of Materials Science Engineering, Yanshan University, Qinhuangdao 066004, ChinaInstitute of Metal Research, Chinese Academy of Sciences, Shenyang 110072, ChinaInstitute of Metal Research, Chinese Academy of Sciences, Shenyang 110072, ChinaSchool of Mechanical and Electrical Engineering, Zhoukou Normal University, Zhoukou 466000, ChinaKey Lab of Metastable Materials Science&Technology, Hebei Key Lab for Optimizing Metal Product Technology and Performance, College of Materials Science Engineering, Yanshan University, Qinhuangdao 066004, ChinaThe strength and plasticity balance of F/B dual-phase X80 pipeline steels strongly depends on deformation compatibility between the soft phase of ferrite and the hard phase of bainite; thus, the tensile strength of ferrite and bainite, as non-negligible factors affecting the deformation compatibility, should be considered first. In this purely theoretical paper, an abstract representative volume elements (RVE) model was developed, based on the mesostructure of an F/B dual-phase X80 pipeline steel. The effect of the yield strength difference between bainite and ferrite on tensile properties and the strain hardening behaviors of the mesostructure was studied. The results show that deformation first occurs in ferrite, and strain and stress localize in ferrite prior to bainite. In the modified Crussard-Jaoul (C-J) analysis, as the yield strength ratio of bainite to ferrite (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>σ</mi><mrow><mi>y</mi><mo>,</mo><mi>B</mi></mrow></msub><mo>/</mo><msub><mi>σ</mi><mrow><mi>y</mi><mo>,</mo><mi>F</mi></mrow></msub></mrow></semantics></math></inline-formula>) increases, the transition strain associated with the deformation transformation from ferrite soft phase deformation to uniform deformation of ferrite and bainite increases. Meanwhile, as the uncoordinated deformation of ferrite and bainite is enhanced, the strain localization factor (SLF) increases, especially the local strain concentration. Consequently, the yield, tensile strength, and yield ratio (yield strength/tensile strength) increase with the increase in <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>σ</mi><mrow><mi>y</mi><mo>,</mo><mi>B</mi></mrow></msub><mo>/</mo><msub><mi>σ</mi><mrow><mi>y</mi><mo>,</mo><mi>F</mi></mrow></msub></mrow></semantics></math></inline-formula>. Inversely, the strain hardening exponent and uniform elongation decrease.https://www.mdpi.com/1996-1944/14/18/5352F/B dual-phase steelstrength difference in bainite to ferritedeformabilitydeformation compatibilitysimulation |
| spellingShingle | Gui-Ying Qiao Zhong-Tao Zhao Xian-Bo Shi Yi-Yin Shan Yu Gu Fu-Ren Xiao Effect of Bainite to Ferrite Yield Strength Ratio on the Deformability of Mesostructures for Ferrite/Bainite Dual-Phase Steels Materials F/B dual-phase steel strength difference in bainite to ferrite deformability deformation compatibility simulation |
| title | Effect of Bainite to Ferrite Yield Strength Ratio on the Deformability of Mesostructures for Ferrite/Bainite Dual-Phase Steels |
| title_full | Effect of Bainite to Ferrite Yield Strength Ratio on the Deformability of Mesostructures for Ferrite/Bainite Dual-Phase Steels |
| title_fullStr | Effect of Bainite to Ferrite Yield Strength Ratio on the Deformability of Mesostructures for Ferrite/Bainite Dual-Phase Steels |
| title_full_unstemmed | Effect of Bainite to Ferrite Yield Strength Ratio on the Deformability of Mesostructures for Ferrite/Bainite Dual-Phase Steels |
| title_short | Effect of Bainite to Ferrite Yield Strength Ratio on the Deformability of Mesostructures for Ferrite/Bainite Dual-Phase Steels |
| title_sort | effect of bainite to ferrite yield strength ratio on the deformability of mesostructures for ferrite bainite dual phase steels |
| topic | F/B dual-phase steel strength difference in bainite to ferrite deformability deformation compatibility simulation |
| url | https://www.mdpi.com/1996-1944/14/18/5352 |
| work_keys_str_mv | AT guiyingqiao effectofbainitetoferriteyieldstrengthratioonthedeformabilityofmesostructuresforferritebainitedualphasesteels AT zhongtaozhao effectofbainitetoferriteyieldstrengthratioonthedeformabilityofmesostructuresforferritebainitedualphasesteels AT xianboshi effectofbainitetoferriteyieldstrengthratioonthedeformabilityofmesostructuresforferritebainitedualphasesteels AT yiyinshan effectofbainitetoferriteyieldstrengthratioonthedeformabilityofmesostructuresforferritebainitedualphasesteels AT yugu effectofbainitetoferriteyieldstrengthratioonthedeformabilityofmesostructuresforferritebainitedualphasesteels AT furenxiao effectofbainitetoferriteyieldstrengthratioonthedeformabilityofmesostructuresforferritebainitedualphasesteels |