Microstructure and tensile properties of chemically heterogeneous steel consisting of martensite and austenite
Source abstract
Abstract
Abstract We made the chemical heterogeneity in steel consisting of mostly martensite with retained austenite by applying intercritical annealing prior to full austenitization. It enables simultaneous improvement in strength and ductility, which have been regarded as mutually exclusive properties. Contribution from two types of chemical heterogeneity could be identified; micro-scale and nano-scale heterogeneity inheriting the chemistry of intercritical austenite and Mn-enriched cementite respectively. The micro-scale chemical heterogeneity creates soft and hard domains in the martensitic microstructure by dissimilar solid solution strengthening, generating strain partition and back stress which contribute to the improvement of strength. On the other hand, the nano-scale chemical heterogeneity from highly Mn-enriched cementite evolved into Mn-enriched austenite in the final microstructure. The exceptional stability of nano-scale Mn-enriched austenite renders persistent strain hardening, contributing the enhanced ductility.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Microstructure and Mechanical Properties of Steels · Metal Alloys Wear and Properties · Hydrogen embrittlement and corrosion behaviors in metals
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (43)
Show source-provided references
1. Heterogeneous lamella structure unites ultrafine-grain strength with coarse-grain ductility10.1073/pnas.1517193112 ↗
2. Extraordinary strain hardening by gradient structure10.1073/pnas.1324069111 ↗
3. Towards strength–ductility synergy through the design of heterogeneous nanostructures in metals10.1016/j.mattod.2017.02.003 ↗
4. Critical assesment 37: harmonic-structure materials - idea, status and perspectives10.1080/02670836.2020.1719306 ↗
5. Additional hardening in harmonic structured materials by strain partitioning and back stress10.1080/21663831.2018.1439115 ↗
6. Harmonic-structured copper: performance and proof of fabrication concept based on severe plastic deformation of powders10.1007/s10853-014-8258-4 ↗
7. Uncertainties in dilatometric determination of martensite start temperature10.1179/174328407X176857 ↗
8. Heterogeneous materials: a new class of materials with unprecedented mechanical properties10.1080/21663831.2017.1343208 ↗
9. Nanodomained nickel unite nanocrystal strength with coarse-grain ductility10.1038/srep11728 ↗
10. Back stress strengthening and strain hardening in gradient structure10.1080/21663831.2016.1153004 ↗
11. Medium Mn transformation-induced plasticity steels: recent progress and challenges10.1016/j.scriptamat.2016.07.013 ↗
12. Effects of annealing conditions on microstructure and mechanical properties of low carbon, manganese transformation-induced plasticity steel10.1007/s12540-009-0909-7 ↗
13. Mn partitioning during the intercritical annealing of ultrafine-grained 6% Mn transformation-induced plasticity steel10.1016/j.scriptamat.2010.12.012 ↗
14. Quenching and partitioning (Q&P) processed medium Mn steel starting from heterogeneous microstructure
15. Chemical boundary engineering: a new route toward lean, ultrastrong yet ductile steels10.1126/sciadv.aay1430 ↗
16. The significance of multi-step partitioning: processing-structure-property relationship in governing high strength-high ductility combination in medium-manganese steels10.1016/j.actamat.2016.10.067 ↗
17. Enhanced ductility of as-quenched martensite by highly stable nano-sized austenite10.1016/j.scriptamat.2021.113955 ↗
18. Refined heterogeneous phase unit enhances ductility in quenched ultra-high strength steels10.1016/j.scriptamat.2020.113636 ↗
19. Flash annealing yields a strong and ductile medium Mn steel with heterogeneous microstructure10.1016/j.scriptamat.2021.113819 ↗
20. De Cooman · 2011
21. Internal-friction analysis of dislocation–interstitial carbon interactions in press-hardened 22MnB5 steel10.1016/j.msea.2015.05.055 ↗
22. Effect of Al on martensite tempering: comparison with Si10.1007/s10853-018-2037-6 ↗
23. Effects of auto-tempering behaviour of martensite on mechanical properties of ultra high strength steel sheets10.1016/j.jallcom.2012.04.108 ↗
24. Observations on the relationship between crystal orientation and the level of auto-tempering in an as-quenched martensitic steel10.3390/met9121255 ↗
25. Effects of solute segregation on tensile properties and serration behavior in ultra-high-strength high-Mn TRIP steels10.1016/j.msea.2018.10.065 ↗
26. A model for ferrite/pearlite band formation and prevention in steels10.1007/s11661-004-0353-8 ↗
27. Development of microstructural banding in low-alloy steel with simulated Mn segregation10.1007/s11661-002-0172-8 ↗
28. Vessel microstructure design: a new approach for site-specific core-shell micromechanical tailoring of TRIP-assisted ultra-high strength steels10.1016/j.actamat.2016.04.051 ↗
29. Multiphase microstructures via confined precipitation and dissolution of vessel phases: example of austenite in martensitic steel10.1016/j.actamat.2014.11.025 ↗
30. Kinetic transitions and Mn partitioning during austenite growth from a mixture of partitioned cementite and ferrite: role of heating rate10.1016/j.jmst.2020.01.051 ↗
31. Magnetic and X-ray diffraction measurements for the determination of retained austenite in TRIP steels10.1016/S0921-5093(01)00965-0 ↗
32. Magnetic measurement of retained austenite in sintered steels – benefits and limitations10.1080/00325899.2018.1530850 ↗
33. Carbon partitioning during bainite transformation in low alloy steels10.1179/026708302225007259 ↗
34. Application of quenching and partitioning processing to medium Mn steel10.1007/s11661-014-2657-7 ↗
35. A general equation prescribing the extent of the austenite-martensite transformation in pure iron-carbon alloys and plain carbon steels10.1016/0001-6160(59)90170-1 ↗
36. Correlation of yield strength and tensile strength with hardness for steels10.1007/s11665-008-9225-5 ↗
37. Nano-indentation investigation on the mechanical stability of individual austenite in high-carbon steel10.1016/j.matchar.2015.10.024 ↗
38. Digital image correlation studies for microscopic strain distribution and damage in dual phase steels10.1016/j.scriptamat.2007.01.031 ↗
39. High resolution in situ mapping of microstrain and microstructure evolution reveals damage resistance criteria in dual phase steels10.1016/j.actamat.2015.05.038 ↗
40. Microstructural banding effects clarified through micrographic digital image correlation10.1016/j.scriptamat.2010.02.014 ↗
41. Quantifying the synergetic strengthening in gradient material10.1016/j.scriptamat.2018.02.039 ↗
42. Synergetic strengthening by gradient structure10.1080/21663831.2014.935821 ↗
43. Self-stabilization of untransformed austenite by hydrostatic pressure via martensitic transformation10.1016/j.actamat.2016.03.048 ↗