Low-angle phase boundary slip transfer and grain refinement enabling the simultaneous enhancement of strength-plasticity in fiber DP steel
At present, the strength-plasticity of sorbite wire rods used for bridge cables is difficult to improve, and there is a serious lead pollution problem during the production process. To develop environmentally friendly materials with excellent strength-plasticity and work-hardening properties as a su...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-07-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425014656 |
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| Summary: | At present, the strength-plasticity of sorbite wire rods used for bridge cables is difficult to improve, and there is a serious lead pollution problem during the production process. To develop environmentally friendly materials with excellent strength-plasticity and work-hardening properties as a substitute for sorbite wire rods, an ultrafine crystalline fiber martensite/ferrite dual-phase (DP) steel with 63 % of low-angle phase boundary (LAPB) was fabricated by compoundly adding Mn, Ni, and Cu elements into a low-carbon alloy steel and combining with cyclic quenching. Research findings that LAPB not only facilitates the activation of identical slip systems in both phases but also enables a relatively high stress projection coefficient, which reaches 0.99, between these sliding systems. This higher stress projection efficiency, on the one hand, reduces the strain gradient of the initial martensite/ferrite, and on the other hand, promotes the deformation of martensite, enabling coordinated deformation and sustained work hardening. Furthermore, grain refinement introduces a high density of interfaces that impede dislocation motion while preventing localized deformation, thereby promoting dislocation-LAPB interactions. The synergistic effect of LAPB and grain refinement enables the strength-plasticity product to reach 16.3 GPa%, which is a 60 % improvement. |
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| ISSN: | 2238-7854 |