Resolving the Martensitic Transformation in Q&amp;P Steels In-Situ at Dynamic Strain Rates Using Synchrotron X-ray Diffraction

Finfrock, Christopher B.; Ellyson, Benjamin; Becker, C. Gus; Copley, John; Fezzaa, Kamel; Parab, Niranjan D.; Sun, Tao; Kirk, Cody; Kedir, Nesredin; Chen, Weinong; Clarke, Amy J.; Clarke, Kester D.

doi:10.1007/s11661-022-06788-x

Cited by 6 publications

(5 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Investigating the interplay between martensite formation, texture evolution, and load partitioning in low‐alloyed TRIP steels Jimenez‐Melero et al [ 57 ] showed a significant fraction of untransformed austenite at fracture of the specimen for two different TRIP steel conditions. Furthermore, in their study investigating the martensitic transformation in Q&P steels, Finfrock et al [ 24 ] reported on untransformed RA in the neck of the specimen after fracture. Eventually, the results presented in these studies can be explained by the absent RA transformation in the strain‐free direction.…”

Section: Resultsmentioning

confidence: 99%

“…This is in line with the observations reported in refs. [24,57]. Investigating the interplay between martensite formation, texture evolution, and load partitioning in low-alloyed TRIP steels Jimenez-Melero et al [57] showed a significant fraction of untransformed austenite at fracture of the specimen for two different TRIP steel conditions.…”

Section: The Lattice Distance Of the Strain-free Orientation Versus L...mentioning

confidence: 99%

“…A lower dislocation density in the martensitic microstructure reduces the stability of the austenite, since less energy is required to plastically deform the martensite during volume expansion in the γ → α´ transformation. Several studies investigating the mechanical behavior of Q&P steels were published by the group of Finfrock et al [ 23,24 ] In their first study, [ 23 ] the authors showed that elevated strain hardening rates were achieved by the TRIP effect at high degrees of plastic strain. In addition, it was reported that neither the RA amount being present prior to straining nor the total RA amount transformed during straining were directly correlated to the mechanical performance under tensile load.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, it was reported that neither the RA amount being present prior to straining nor the total RA amount transformed during straining were directly correlated to the mechanical performance under tensile load. Recently, Finfrock et al [ 24 ] investigated the martensitic transformation in Q&P steels containing different RA amounts at dynamic strain rates using in situ synchrotron X‐ray diffraction (XRD). A lower yield strength (YS) and a higher ductility were revealed for the condition containing a higher fraction of soft ferrite.…”

Section: Introductionmentioning

confidence: 99%

“…This especially holds true with respect to the RA stability. However, first results presented in literature [ 24 ] show that in situ characterization by XRD experiments might pave the way for a more fundamental understanding of the martensitic transformation in Q&P steels. Thus, the motivation of the present study is to provide a thorough experimental characterization of microstructure evolution and austenite stability, respectively, of a Q&P steel subjected to external load.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Experimental Analysis of the Stability of Retained Austenite in a Low‐Alloy 42CrSi Steel after Different Quenching and Partitioning Heat Treatments

et al. 2023

View full text Add to dashboard Cite

Quenching and partitioning (Q&P) steels are characterized by an excellent combination of strength and ductility, opening up great potentials for advanced lightweight components. The Q&P treatment results in microstructures with a martensitic matrix being responsible for increased strength whereas interstitially enriched metastable retained austenite (RA) contributes to excellent ductility. Herein, a comprehensive experimental characterization of microstructure evolution and austenite stability is carried out on a 42CrSi steel being subjected to different Q&P treatments. The microstructure of both conditions is characterized by scanning electron microscopy as well as X‐ray diffraction (XRD) phase analysis. Besides macroscopic standard tensile tests, RA evolution under tensile loading is investigated by in situ XRD using synchrotron and laboratory methods. As a result of different quenching temperatures, the two conditions considered are characterized by different RA contents and morphologies, resulting in different strain hardening behaviors as well as strength and ductility values under tensile loading. In situ synchrotron measurements show differences in the transformation kinetics being rationalized by the different morphologies of the RA. Eventually, the evolution of the phase specific stresses can be explained by the well‐known Masing model.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: The Lattice Distance Of the Strain-free Orientation Versus L...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Experimental Analysis of the Stability of Retained Austenite in a Low‐Alloy 42CrSi Steel after Different Quenching and Partitioning Heat Treatments

et al. 2023

View full text Add to dashboard Cite

show abstract

In-Situ X-ray Diffraction Analysis of Metastable Austenite Containing Steels Under Mechanical Loading at a Wide Strain Rate Range

Isakov

Langi

Pun

et al. 2023

Metall Mater Trans A

View full text Add to dashboard Cite

This paper presents and discusses the methodology and technical aspects of mechanical tests carried out at a wide strain rate range with simultaneous synchrotron X-ray diffraction measurements. The motivation for the study was to develop capabilities for in-situ characterization of the loading rate dependency of mechanically induced phase transformations in steels containing metastable austenite. The experiments were carried out at the DanMAX beamline of the MAX IV Laboratory, into which a custom-made tensile loading device was incorporated. The test setup was supplemented with in-situ optical imaging of the specimen, which allowed digital image correlation-based deformation analysis. All the measurement channels were synchronized to a common time basis with trigger signals between the devices as well as post-test fine tuning based on diffraction ring shape analysis. This facilitated precise correlation between the mechanical and diffraction data at strain rates up to 1 s−1 corresponding to test duration of less than one second. Diffraction data were collected at an acquisition rate of 250 Hz, which provided excellent temporal resolution. The feasibility of the methodology is demonstrated by providing novel data on the kinetics of the martensitic phase transformation in EN 1.4318-alloy following a rapid increase in strain rate (a so-called jump test).

show abstract

Effect of austenitizing temperature and cooling rate on Ms temperature of Fe–Ni–Cr cast iron

Cao,

Wang,

Liu

et al. 2023

Journal of Materials Research and Technology

View full text Add to dashboard Cite

Resolving the Martensitic Transformation in Q&P Steels In-Situ at Dynamic Strain Rates Using Synchrotron X-ray Diffraction

Cited by 6 publications

References 26 publications

Experimental Analysis of the Stability of Retained Austenite in a Low‐Alloy 42CrSi Steel after Different Quenching and Partitioning Heat Treatments

Experimental Analysis of the Stability of Retained Austenite in a Low‐Alloy 42CrSi Steel after Different Quenching and Partitioning Heat Treatments

In-Situ X-ray Diffraction Analysis of Metastable Austenite Containing Steels Under Mechanical Loading at a Wide Strain Rate Range

Effect of austenitizing temperature and cooling rate on Ms temperature of Fe–Ni–Cr cast iron

Contact Info

Product

Resources

About