Impact toughness and fracture propagation mechanism of NiAl precipitation-strengthened HSLA steels
Impact toughness is essential for evaluating the mechanical properties of ship hull steels. This study focused on understanding the embrittlement mechanism of NiAl precipitation-strengthened HSLA steels by integrating advanced characterization and atomic-scale calculations. The factors causing the d...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2024-05-01
|
| Series: | Materials & Design |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127524003009 |
| _version_ | 1797208890874527744 |
|---|---|
| author | Xiangyun Zhang Jialong Wang Tao Zhou Ling Yan Hao Yu |
| author_facet | Xiangyun Zhang Jialong Wang Tao Zhou Ling Yan Hao Yu |
| author_sort | Xiangyun Zhang |
| collection | DOAJ |
| description | Impact toughness is essential for evaluating the mechanical properties of ship hull steels. This study focused on understanding the embrittlement mechanism of NiAl precipitation-strengthened HSLA steels by integrating advanced characterization and atomic-scale calculations. The factors causing the deterioration of the impact toughness of NiAl precipitation-strengthened steels, which have been contentious, were identified. The embrittlement mechanism and crack propagation mode were revealed using first-principles calculations and 3D impact fracture morphology, respectively. The results suggested that the numerous homogeneous NiAl nanoparticles within the bcc-Fe matrix reduced the impact toughness of the HSLA steels. As the precipitate interparticle spacing (L) decreased, the impact toughness decreased until it attained a critical value (∼27 nm). This is interpreted effectively by the calculations indicating that the shear modulus (75 GPa) and fracture energy (4.5 J/m2) of the NiAl phase, particularly the NiAlMn phase (46 GPa, 4 J/m2), are significantly lower than those of bcc-Fe (83 GPa, 5 J/m2). This induces the fracture of nanoparticles under rapid impact loading, which functions as numerous crack initiations before plastic deformation of the matrix. The small L achieved after peak-hardening aging can result in the interconnection of these crack sources and cause instantaneous cleavage fractures, similar to brittle materials. |
| first_indexed | 2024-04-24T09:46:00Z |
| format | Article |
| id | doaj.art-df864b685617472db60bb065573f9cf6 |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-04-24T09:46:00Z |
| publishDate | 2024-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-df864b685617472db60bb065573f9cf62024-04-15T04:05:33ZengElsevierMaterials & Design0264-12752024-05-01241112927Impact toughness and fracture propagation mechanism of NiAl precipitation-strengthened HSLA steelsXiangyun Zhang0Jialong Wang1Tao Zhou2Ling Yan3Hao Yu4School of Materials Science and Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Road, Haidian District, Beijing 100083, China; State Key Laboratory of Metal Material for Marine Equipment and Application, No. 63, Wuyi Road, Tiedong District, Anshan, Liaoning Province 114009, ChinaSchool of Materials Science and Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Road, Haidian District, Beijing 100083, ChinaDepartment of Materials Science and Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, SwedenState Key Laboratory of Metal Material for Marine Equipment and Application, No. 63, Wuyi Road, Tiedong District, Anshan, Liaoning Province 114009, China; Corresponding authors.School of Materials Science and Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Road, Haidian District, Beijing 100083, China; Corresponding authors.Impact toughness is essential for evaluating the mechanical properties of ship hull steels. This study focused on understanding the embrittlement mechanism of NiAl precipitation-strengthened HSLA steels by integrating advanced characterization and atomic-scale calculations. The factors causing the deterioration of the impact toughness of NiAl precipitation-strengthened steels, which have been contentious, were identified. The embrittlement mechanism and crack propagation mode were revealed using first-principles calculations and 3D impact fracture morphology, respectively. The results suggested that the numerous homogeneous NiAl nanoparticles within the bcc-Fe matrix reduced the impact toughness of the HSLA steels. As the precipitate interparticle spacing (L) decreased, the impact toughness decreased until it attained a critical value (∼27 nm). This is interpreted effectively by the calculations indicating that the shear modulus (75 GPa) and fracture energy (4.5 J/m2) of the NiAl phase, particularly the NiAlMn phase (46 GPa, 4 J/m2), are significantly lower than those of bcc-Fe (83 GPa, 5 J/m2). This induces the fracture of nanoparticles under rapid impact loading, which functions as numerous crack initiations before plastic deformation of the matrix. The small L achieved after peak-hardening aging can result in the interconnection of these crack sources and cause instantaneous cleavage fractures, similar to brittle materials.http://www.sciencedirect.com/science/article/pii/S0264127524003009Impact toughnessNiAl nanoprecipitatesHSLA steelPrecipitation behaviorDensity functional theory |
| spellingShingle | Xiangyun Zhang Jialong Wang Tao Zhou Ling Yan Hao Yu Impact toughness and fracture propagation mechanism of NiAl precipitation-strengthened HSLA steels Materials & Design Impact toughness NiAl nanoprecipitates HSLA steel Precipitation behavior Density functional theory |
| title | Impact toughness and fracture propagation mechanism of NiAl precipitation-strengthened HSLA steels |
| title_full | Impact toughness and fracture propagation mechanism of NiAl precipitation-strengthened HSLA steels |
| title_fullStr | Impact toughness and fracture propagation mechanism of NiAl precipitation-strengthened HSLA steels |
| title_full_unstemmed | Impact toughness and fracture propagation mechanism of NiAl precipitation-strengthened HSLA steels |
| title_short | Impact toughness and fracture propagation mechanism of NiAl precipitation-strengthened HSLA steels |
| title_sort | impact toughness and fracture propagation mechanism of nial precipitation strengthened hsla steels |
| topic | Impact toughness NiAl nanoprecipitates HSLA steel Precipitation behavior Density functional theory |
| url | http://www.sciencedirect.com/science/article/pii/S0264127524003009 |
| work_keys_str_mv | AT xiangyunzhang impacttoughnessandfracturepropagationmechanismofnialprecipitationstrengthenedhslasteels AT jialongwang impacttoughnessandfracturepropagationmechanismofnialprecipitationstrengthenedhslasteels AT taozhou impacttoughnessandfracturepropagationmechanismofnialprecipitationstrengthenedhslasteels AT lingyan impacttoughnessandfracturepropagationmechanismofnialprecipitationstrengthenedhslasteels AT haoyu impacttoughnessandfracturepropagationmechanismofnialprecipitationstrengthenedhslasteels |