Influence of various material design parameters on deformation behaviors of TRIP steels

Choi, Kyoo Sil; Soulami, Ayoub; Liu, Wenning N.; X, Sun; Khaleel, Mohammad A.

doi:10.1016/j.commatsci.2010.10.002

Cited by 47 publications

(19 citation statements)

References 32 publications

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“…Therefore, the TRIP effect improves the formability and energy absorption of such steels. Since the volume fraction and distribution of RA plays a key role in improving the mechanical properties of TRIP steels [9], the characterization and understanding of RA is important [8].…”

Section: Introductionmentioning

confidence: 99%

Effects of retained austenite volume fraction, morphology, and carbon content on strength and ductility of nanostructured TRIP-assisted steels

Shen

Qiu

Sun

et al. 2015

Materials Science and Engineering: A

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204

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With a suite of multi-modal and multi-scale characterization techniques, the present study unambiguously proves that a substantially-improved combination of ultrahigh strength and good ductility can be achieved by tailoring the volume fraction, morphology, and carbon content of the retained austenite (RA) in a transformation-induced-plasticity (TRIP) steel with the nominal chemical composition of 0.19C-0.30Si-1.76Mn-1.52Al (weight percent, wt.%). After intercritical annealing and bainitic holding, a combination ultimate tensile strength (UTS) of 1,100 MPa and true strain of 50% has been obtained, as a result of the ultrafine RA lamellae, which are alternately arranged in the bainitic ferrite around junction regions of ferrite grains. For reference, specimens with a blocky RA, prepared without the bainitic holding, yield a low ductility (35%) and a low UTS (800 MPa). The volume fraction, morphology, and carbon content of RA have been characterized using various techniques, including magnetic probing, scanning electron microscopy (SEM), electron-backscatter-diffraction (EBSD), and transmission electron microscopy (TEM). Interrupted tensile tests, mapped using EBSD in conjunction with the kernel average misorientation (KAM) analysis, reveal that the lamellar RA is the governing microstructure component responsible for the higher mechanical stability, compared to the blocky one. By coupling these various techniques, we quantitatively demonstrate that in addition to the RA volume fraction, its morphology and carbon content are equally important in optimizing the strength and ductility of TRIP-assisted steels.

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Section: Introductionmentioning

confidence: 99%

Effects of retained austenite volume fraction, morphology, and carbon content on strength and ductility of nanostructured TRIP-assisted steels

Shen

Qiu

Sun

et al. 2015

Materials Science and Engineering: A

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204

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“…Based on the work of Chen et al [13] and Sun et al [22][23][24], we suggest that the critical plastic strain ε pc at the interface essentially depends on the microhardness difference between two adjacent phases; thus, the ε pc decreased with increasing microhardness difference. Moreover, according to the criterion for a crack to nucleate [25][26][27][28], when the plastic Fig.…”

Section: Resultsmentioning

confidence: 91%

“…Various criteria have been proposed to capture this failure mechanism for various materials. On the condition of tensile stress, Sun et al [22][23][24] suggested that the hardness differences in the constituent phases will induce different levels of strain localizations, hence, different ultimate fracture points. They found that under plane stress state with free lateral boundary, shear dominant failure mode develops and leads to final failure of the representative volume elements.…”

Section: Resultsmentioning

confidence: 99%

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

Wang

Liu

et al. 2015

Mechanics of Advanced Materials and Structures

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The fracture mode in different M-A constituents containing multiphase steels under impact load was examined considering their microstructural and micromechanical aspects. The results showed that a ductile fracture develops in the fine-grained bainitic ferrite/M-A multiphase by microvoids initiation and coalescence, while cleavage develops in the coarse-grained polygonal ferrite/M-A multiphase by microcracks initiation and propagation, due to their diversities in morphologies of microstructural components and microhardness difference between phases.

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“…Usually, Q&P steels have very complex microstructures constituted of a variety of different phases including retained austenite, tempered/untempered martensite and ferrite [46]. Individual phase constitutive properties (especially the flow behavior) are therefore crucial in determining the overall mechanical properties of the material, including tensile strength, ductility, and formability [47,48]. On the characterization side, even though there have been many nanoindentation studies on multi-phase alloys [20,[37][38][39][40][41][42][43][44][45], most of them measured and made direct use of the nanohardness [38,43], and few attempted to calculate the entire flow behavior of individual phases including yield strength and hardening exponent [20].…”

Section: Introductionmentioning

confidence: 99%

Determining individual phase properties in a multi-phase Q&P steel using multi-scale indentation tests

Cheng

Choi

et al. 2016

Materials Science and Engineering: A

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a b s t r a c tA new inverse method was developed to predict the stress-strain behaviors of constituent phases in a multi-phase steel using the load-depth curves measured in nanoindentation tests combined with microhardness measurements. A power law hardening response was assumed for each phase, and an empirical relationship between hardness and yield strength was assumed. Adjustment was made to eliminate the indentation size effect and indenter bluntness effect. With the newly developed inverse method and statistical analysis of the hardness histogram for each phase, the average stress-strain curves of individual phases in a quench and partitioning (Q&P) steel, including austenite, tempered martensite and untempered martensite, were calculated and the results were compared with the phase properties obtained by in-situ high energy X-ray diffraction (HEXRD) test. It is demonstrated that multiscale instrumented indentation tests together with the new inverse method are capable of determining the individual phase flow properties in multi-phase alloys.

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Influence of various material design parameters on deformation behaviors of TRIP steels

Cited by 47 publications

References 32 publications

Effects of retained austenite volume fraction, morphology, and carbon content on strength and ductility of nanostructured TRIP-assisted steels

Effects of retained austenite volume fraction, morphology, and carbon content on strength and ductility of nanostructured TRIP-assisted steels

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

Determining individual phase properties in a multi-phase Q&P steel using multi-scale indentation tests

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