The Effect of Cr on Phase Transformation Behavior of Austenite in Fe-20Mn-9Al-1.2C-xCr Low-density Steels During Isothermal Aging

다국어 초록 (Multilingual Abstract)

The influence of Cr on the microstructural evolution of austenite in Fe-20Mn-9Al-1.2C-xCr (wt%, x = 0, 3 and 6) low-densitysteels during isothermal aging at 650 °C for various durations was systematically investigated. With the isothermal agingprocessed, the 0Cr and 3Cr samples underwent the divorced eutectoid transformation followed by the eutectoid transformation,while only the eutectoid transformation was observed in the 6Cr sample. Meanwhile, increasing Cr content changedthe eutectoid transformation products from ferrite + κ-carbide in the 0Cr sample to ferrite + κ-carbide + M23C6carbide in the3Cr sample, and to ferrite + M7C3carbide in the 6Cr sample. The Cr addition significantly increased the A1 temperature (655°C) of the 0Cr sample to 712 °C of the 3Cr sample, and to 841 °C of the 6Cr sample. As a result, the temperature differencebetween the A1 temperature and experimental phase transformation temperature (650 °C) was enlarged, which provided agreater driving force for the eutectoid transformation and accelerated the transformation rate of eutectoid transformation. Inaddition, the Cr addition had a significant effect on the diffusion of constituent elements, decreased the interlayer spacingof pearlite structure from 625 ± 30 nm in the 0Cr sample to 385 ± 25 nm in the 3Cr sample, and to 150 ± 20 nm in the 6Crsample, refining the eutectoid structure. These findings revealed the mechanism regarding the effect of Cr addition on theeutectoid transformation of austenite, offering valuable insights into the microstructure design of high-performance lowdensitysteels.

참고문헌 (Reference)

1 L. Sozańska Jędrasik, 63 : 265-276, 2018

2 Wenwen Song, "κ-Phase Formation in Fe-Mn-Al-C Austenitic Steels" Wiley 86 (86): 1161-1169, 2015

3 C. Mapelli, "γ Decomposition in Fe–Mn–Al–C lightweight steels" Elsevier BV 9 (9): 4604-4616, 2020

4 J Lee, "The influence of Cr alloying on microstructures of Fe–Al–Mn–Cr alloys" Elsevier BV 50 (50): 1389-1393, 2004

5 J. D. Verhoeven, "The divorced eutectoid transformation in steel" Springer Science and Business Media LLC 29 (29): 1181-1189, 1998

6 Yang Yang, "Structures and properties of Fe-(8-16)Mn-9Al-0.8C low density steel made by a centrifugal casting in near-rapid solidification" Elsevier BV 748 : 74-84, 2019

7 M.J. Yao, "Strengthening and strain hardening mechanisms in a precipitation-hardened high-Mn lightweight steel" Elsevier BV 140 : 258-273, 2017

8 Jianlei Zhang, "Revisiting the formation mechanism of intragranular κ-carbide in austenite of a Fe-Mn-Al-Cr-C low-density steel" Elsevier BV 199 : 113836-, 2021

9 Chiung-Fang Huang, "Research of phase transformation on Fe–8.7Al–28.3Mn–1C–5.5Cr alloy" Elsevier BV 488 (488): 246-249, 2009

10 Wei-Chun Cheng, "Phase transformation of the L1 2 phase to kappa-carbide after spinodal decomposition and ordering in an Fe–C–Mn–Al austenitic steel" Elsevier BV 642 : 128-135, 2015

11 Joonoh Moon, "Phase transformation mechanism and hardness during ageing of an austenitic Fe-30Mn-10.5Al-1.1C-3Mo lightweight steel" Elsevier BV 804 : 511-520, 2019

12 Wei-Chun Cheng, "Phase Transformations of an Fe-0.85 C-17.9 Mn-7.1 Al Austenitic Steel After Quenching and Annealing" Springer Science and Business Media LLC 66 (66): 1809-1820, 2014

13 C.W. Kim, "Partitioning of C into κ-carbides by Si addition and its effect on the initial deformation mechanism of Fe-Mn-Al-C lightweight steels" Elsevier BV 775 : 554-564, 2019

14 Christian Haase, "On the deformation behavior of κ-carbide-free and κ-carbide-containing high-Mn light-weight steel" Elsevier BV 122 : 332-343, 2017

15 K. Chadha ; Davood Shahriari ; C. Jr. Aranas ; Louis‑Philippe Lapierre‑Boire ; Mohammad Jahazi, "On the Role of Chromium in Dynamic Transformation of Austenite" 대한금속·재료학회 25 (25): 559-569, 2019

16 Wei-Chun Cheng, "On the Eutectoid Reaction in a Quaternary Fe-C-Mn-Al Alloy: Austenite → Ferrite + Kappa-Carbide + M23C6 Carbide" Springer Science and Business Media LLC 45 (45): 1199-1216, 2013

17 Shih-Ying Chang, "Morphology and kinetics of discontinuous precipitation and dissolution in an Fe-8.5Al-27Mn-1.0Si-0.92C alloy" Springer Science and Business Media LLC 34 (34): 25-31, 2003

18 Jianlei Zhang, "Microstructures, mechanical properties and deformation of near-rapidly solidified low-density Fe-20Mn-9Al-1.2C-xCr steels" Elsevier BV 186 : 108307-, 2020

19 Georg Frommeyer, "Microstructures and Mechanical Properties of High-Strength Fe-Mn-Al-C Light-Weight TRIPLEX Steels" Wiley 77 (77): 627-633, 2006

20 Yuxiang Liu, "Microstructure and mechanical properties of a Fe–28Mn–9Al-1.2C-(0, 3, 6, 9)Cr austenitic low-density steel" Elsevier BV 821 : 141583-, 2021

21 Shengqiang Ma, "Microstructure and crystallography of M7C3 carbide in chromium cast iron" Elsevier BV 161 : 65-73, 2015

22 Yunik Kwon ; Ji Hyun Hwang ; Hee Chae Choi ; T. T. T. Trang ; Byoungkoo Kim ; A. Zargaran ; Nack J. Kim, "Microstructure and Tensile Properties of Ferritic Lightweight Steel Produced by Twin-Roll Casting" 대한금속·재료학회 26 (26): 75-82, 2020

23 W.K. Choo, "Microstructural change in austenitic Fe-30.0wt%Mn-7.8wt%Al-1.3wt%C initiated by spinodal decomposition and its influence on mechanical properties" Elsevier BV 45 (45): 4877-4885, 1997

24 Ivan Gutierrez-Urrutia, "Low Density Fe–Mn–Al–C Steels: Phase Structures, Mechanisms and Properties" Iron and Steel Institute of Japan 61 (61): 16-25, 2021

25 Joonoh Moon, "Investigations of the microstructure evolution and tensile deformation behavior of austenitic Fe-Mn-Al-C lightweight steels and the effect of Mo addition" Elsevier BV 147 : 226-235, 2018

26 Yuji Sutou, "High-strength Fe–20Mn–Al–C-based Alloys with Low Density" Iron and Steel Institute of Japan 50 (50): 893-899, 2010

27 Yi Hsuan Tuan, "Grain Boundary Precipitation in Fe-30Mn-9Al-5Cr-0.7C Alloy" Japan Institute of Metals 49 (49): 1589-1593, 2008

28 Gitae Park ; Seonghoon Jeong ; Changhee Lee, "Fusion Weldabilities of Advanced High Manganese Steels: A Review" 대한금속·재료학회 27 (27): 2046-2058, 2021

29 Minoru Honjo, "Effect of Cr on Lamellar Spacing and High-Temperature Stability in Eutectoid Steels" Iron and Steel Institute of Japan 56 (56): 161-167, 2016

30 A. S. Pandit, "Divorced pearlite in steels" The Royal Society 468 (468): 2767-2778, 2012

31 Shangping Chen, "Current state of Fe-Mn-Al-C low density steels" Elsevier BV 89 : 345-391, 2017

32 John Chance, "Chromium partitioning during isothermal transformation of a eutectoid steel" Springer Science and Business Media LLC 12 (12): 1205-1213, 1981

33 Kyeong-Won Kim, "Characterization of microstructural evolution in austenitic Fe-Mn-Al-C lightweight steels with Cr content" Elsevier BV 170 : 110717-, 2020

34 Libing Liu, "A simple method to produce austenite-based low-density Fe–20Mn–9Al–0.75C steel by a near-rapid solidification process" Elsevier BV 679 : 282-291, 2017

35 Joonoh Moon, "A new class of lightweight, stainless steels with ultra-high strength and large ductility" Springer Science and Business Media LLC 10 (10): 12140-, 2020

36 O. A. Zambrano, "A general perspective of Fe–Mn–Al–C steels" Springer Science and Business Media LLC 53 (53): 14003-14062, 2018

37 Wei-Chun Cheng, "A Eutectoid Reaction for the Decomposition of Austenite into Pearlitic Lamellae of Ferrite and M23C6 Carbide in a Mn-Al Steel" Springer Science and Business Media LLC 42 (42): 1760-1766, 2011