Fracture Mode of Martensite-Austenite Constituents Containing Multiphase Steel Controlled by Microstructural and Micromechanical Aspects

Wang, Yuhui; Wang, Qingfeng; Liu, Ligang; Xu, Wenwen

doi:10.1080/15376494.2013.828808

Cited by 10 publications

(6 citation statements)

References 32 publications

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“…The results presented in this paper are based on the theoretical and experimental studies on processing routes for structural high-strength low-alloy (HSLA) steel previously fulfilled by Ishikawa et al [71], Wang et al [35], Misra et al [17,18], Bhadeshia et al [32,33], and many other researchers. The novelty of this work is that it compared The obtained data showed that varying only the finish rolling temperature and increasing the post-rolling cooling rate could increase the yield strength of (Nb+V+Al)-microalloyed steel of S355 grade by about 30% from 390 to 544 MPa.…”

Section: Variation Of the Ductile-brittle Transition Temperature Depe...mentioning

confidence: 98%

“…The acicular ferrite is characterized by high-angle boundaries, which is beneficial for the hindering of crack propagation [34]. Under a certain cooling rate, the martensite/austenite (M/A) conglomerates also appeared in the structure contributing to steel strength [35]. The pearlite-free structures mentioned earlier could be formed in low-carbon structural steel using post-rolling AC, which suppresses the austenite→pearlite transformation [36,37].…”

Section: Introductionmentioning

confidence: 96%

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Enhancing the Tensile Properties and Ductile-Brittle Transition Behavior of the EN S355 Grade Rolled Steel via Cost-Saving Processing Routes

Zurnadzhy,

Stavrovskaia,

Chabak

et al. 2024

Materials

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Structural rolled steels are the primary products of modern ferrous metallurgy. Consequently, enhancing the mechanical properties of rolled steel using energy-saving processing routes without furnace heating for additional heat treatment is advisable. This study compared the effect on the mechanical properties of structural steel for different processing routes, like conventional hot rolling, normalizing rolling, thermo-mechanically controlled processing (TMCP), and TMCP with accelerating cooling (AC) to 550 °C or 460 °C. The material studied was a 20 mm-thick sheet of S355N grade (EN 10025) made of low-carbon (V+Nb+Al)-micro-alloyed steel. The research methodology included standard mechanical testing and microstructure characterization using optical microscopy, scanning and transmission electronic microscopies, energy dispersive X-ray spectrometry, and X-ray diffraction. It was found that using different processing routes could increase the mechanical properties of the steel sheets from S355N to S550QL1 grade without additional heat treatment costs. TMCP followed by AC to 550 °C ensured the best combination of strength and cold-temperature resistance due to formation of a quasi-polygonal/acicular ferrite structure with minor fractions of dispersed pearlite and martensite/austenite islands. The contribution of different structural factors to the yield tensile strength and ductile–brittle transition temperature of steel was analyzed using theoretical calculations. The calculated results complied well with the experimental data. The effectiveness of the cost-saving processing routes which may bring definite economic benefits is concluded.

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Section: Variation Of the Ductile-brittle Transition Temperature Depe...mentioning

confidence: 98%

Section: Introductionmentioning

confidence: 96%

Enhancing the Tensile Properties and Ductile-Brittle Transition Behavior of the EN S355 Grade Rolled Steel via Cost-Saving Processing Routes

Zurnadzhy,

Stavrovskaia,

Chabak

et al. 2024

Materials

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“…Furthermore, the hardness and elastic modulus of the M/A constituent differ from the matrix's, resulting in uncoordinated displacement during the impact test deformation process. This will further increase the stress around the M/A constituents [19,22]; therefore, the M/A constituents in the CGHAZ tend to be the crack sources. Previous studies have indicated that toughness deteriorates upon increasing the M/A constituent content and size.…”

Section: Effect Of Heat Input On the Cghaz Impact Toughnessmentioning

confidence: 99%

Improvement of impact toughness by microstructure refinement of simulated CGHAZ through enhancing welding heat input of low carbon Mo-V-Ti-N-B steel

Fan¹,

Shi²,

Wang³

et al. 2022

Mater. Res. Express

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Welding heat input greatly influences the microstructure and impacts the affected zone's toughness. To interpret the relationships between the welding heat input, microstructure, and low-temperature toughness of the coarse-grained heat-affected zone (CGHAZ) of Mo-V-Ti-N-B steels, welding heat cycles with different heat inputs (25–75 kJ/cm) were performed on a Gleeble 3500 simulator. Intragranular ferrite in the simulated samples subjected to different thermal cycles was characterized and quantified, and the impact energies of simulated samples were evaluated at -20 °C. Upon increasing the heat input, the intragranular ferrite content rose sharply from 4.3% to 76.0%. The V(C,N) enrichment on the precipitate surface increased the size of precipitates, providing favourable nucleation conditions for intragranular ferrite. The prior austenite grain (PAG) and martensite/austenite (M/A) constituents became rough, and the content of the M/A constituent increased while the impact energy of the CGHAZ increased. This behaviour occurred due to the formation of intragranular acicular ferrite (IGAF), which refined the microstructure of the CGHAZ. Grain refinement eliminated the negative influence of higher M/A content on the impact toughness of the CGHAZ.

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“…1,[131][132][133][134][135][136] The excellent ductility and strength in TRIP steels is a result of deformation based conversion of RA (retained austenite) to the martensite phase. 1,[137][138][139][140][141][142][143][144][145] This transformation (on deformation) of phases is called TRIP effect. 1,146 Figure 11 presents the TRIP effect during tensile testing of a specimen.…”

Section: Transformation-induced Plasticity Steelsmentioning

confidence: 99%

Third generation of advanced high-strength steels: Processing routes and properties

Nanda

Singh

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part L:

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The automobile industry is presently focusing on processing of advanced steels with superior strength-ductility combination and lesser weight as compared to conventional high-strength steels. Advanced high-strength steels are a new class of materials to meet the need of high specific strength while maintaining the high formability required for processing, and that too at reasonably low cost. First and second generation of advanced high-strength steels suffered from some limitations. First generation had high strength but low formability while second generation possessed both strength and ductility but was not cost effective. Amongst the different types of advanced high-strength steels grades, dual-phase steels, transformation-induced plasticity steels, and complex phase steels are considered as very good options for being extended into third generation advanced high-strength steels. The present review presents the various processing routes for these grades developed and discussed by different authors. A novel processing route known as quenching and partitioning route is also discussed. The review also discusses the resulting microstructures and mechanical properties achieved under various processing conditions. Finally, the key findings with regards to further research required for the processing of advanced high-strength steels of third generation have been discussed.

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Fracture Mode of Martensite-Austenite Constituents Containing Multiphase Steel Controlled by Microstructural and Micromechanical Aspects

Cited by 10 publications

References 32 publications

Enhancing the Tensile Properties and Ductile-Brittle Transition Behavior of the EN S355 Grade Rolled Steel via Cost-Saving Processing Routes

Enhancing the Tensile Properties and Ductile-Brittle Transition Behavior of the EN S355 Grade Rolled Steel via Cost-Saving Processing Routes

Improvement of impact toughness by microstructure refinement of simulated CGHAZ through enhancing welding heat input of low carbon Mo-V-Ti-N-B steel

Third generation of advanced high-strength steels: Processing routes and properties

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