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Title: Temperature-dependent micromechanical behavior of medium-Mn transformation-induced-plasticity steel studied by in situ synchrotron X-ray diffraction

Abstract

The temperature-dependent micromechanical behavior of medium-Mn transformation-induced-plasticity (TRIP) steel with a nominal chemical composition of Fe-0.1C-10Mn-2Al (mass%) fabricated by intercritical annealing 650 ºC for 1 h after cold-rolling, was investigated using in situ high-energy X-ray diffraction (HE-XRD) with uniaxial tensile tests at temperatures of 100, 25 and -50 ºC. We find that as the deformation temperature decreases, the Luders strain decreases and more austenite transforms to martensite during Luders band propagation. The Luders bands are associated with sudden changes of lattice strain in austenite. At 100 ºC, austenite is too stable to transform to martensite, resulting in limited work-hardening capability and a relatively low strain to failure. At 25 ºC, the austenite is found to transform in bursts during applied loading. These transformations correlate with stepwise peak broadening in the austenite phase and are attributed to Portevin-Le Chatelier (PLC) band propagation. At -50 ºC, we then observe a more intense TRIP effect which suppresses PLC band formation and leads to a high ultimate tensile strength. In addition to the TRIP effect, we find that work hardening in the deformation-induced martensite phase plays an important role in the plastic stability at low temperature, by accommodating stress compatibility between grains and phases.more » Our studies provide the first direct experimental evidence for the existence of large stress concentrations in the austenite phase near the Luders band propagation front. These observations help to deepen understanding of the complex temperature-dependent micromechanical behaviors of advanced medium-Mn TRIP steels.« less

Authors:
 [1];  [2];  [2];  [2];  [2];  [3];  [3];  [3]
  1. Univ. of Science and Technology Beijing (China). State Key Lab. for Advanced Metals and Materials and Collaborative Innovation Center of Steel Technology; Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS) and X-ray Science Division
  2. Univ. of Science and Technology Beijing (China). State Key Lab. for Advanced Metals and Materials
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS) and X-ray Science Division
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Natural Science Foundation of China (NNSFC); Ministry of Education (MOE) (China)
OSTI Identifier:
1461272
Alternate Identifier(s):
OSTI ID: 1549950
Grant/Contract Number:  
[AC02-06CH11357; 51471032; 51231002; 51527801; 06111020; 06111040; 2016Z-01; 2016Z-12; 2016Z-19]
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
[ Journal Volume: 141; Journal Issue: C]; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Austenite stability; High-energy X-ray diffraction; Load partitioning; Medium-Mn TRIP steel

Citation Formats

Zhang, Minghe, Li, Longfei, Ding, Jie, Wu, Qingbao, Wang, Yan-Dong, Almer, Jonathan, Guo, Fangmin, and Ren, Yang. Temperature-dependent micromechanical behavior of medium-Mn transformation-induced-plasticity steel studied by in situ synchrotron X-ray diffraction. United States: N. p., 2017. Web. doi:10.1016/j.actamat.2017.09.030.
Zhang, Minghe, Li, Longfei, Ding, Jie, Wu, Qingbao, Wang, Yan-Dong, Almer, Jonathan, Guo, Fangmin, & Ren, Yang. Temperature-dependent micromechanical behavior of medium-Mn transformation-induced-plasticity steel studied by in situ synchrotron X-ray diffraction. United States. doi:10.1016/j.actamat.2017.09.030.
Zhang, Minghe, Li, Longfei, Ding, Jie, Wu, Qingbao, Wang, Yan-Dong, Almer, Jonathan, Guo, Fangmin, and Ren, Yang. Thu . "Temperature-dependent micromechanical behavior of medium-Mn transformation-induced-plasticity steel studied by in situ synchrotron X-ray diffraction". United States. doi:10.1016/j.actamat.2017.09.030. https://www.osti.gov/servlets/purl/1461272.
@article{osti_1461272,
title = {Temperature-dependent micromechanical behavior of medium-Mn transformation-induced-plasticity steel studied by in situ synchrotron X-ray diffraction},
author = {Zhang, Minghe and Li, Longfei and Ding, Jie and Wu, Qingbao and Wang, Yan-Dong and Almer, Jonathan and Guo, Fangmin and Ren, Yang},
abstractNote = {The temperature-dependent micromechanical behavior of medium-Mn transformation-induced-plasticity (TRIP) steel with a nominal chemical composition of Fe-0.1C-10Mn-2Al (mass%) fabricated by intercritical annealing 650 ºC for 1 h after cold-rolling, was investigated using in situ high-energy X-ray diffraction (HE-XRD) with uniaxial tensile tests at temperatures of 100, 25 and -50 ºC. We find that as the deformation temperature decreases, the Luders strain decreases and more austenite transforms to martensite during Luders band propagation. The Luders bands are associated with sudden changes of lattice strain in austenite. At 100 ºC, austenite is too stable to transform to martensite, resulting in limited work-hardening capability and a relatively low strain to failure. At 25 ºC, the austenite is found to transform in bursts during applied loading. These transformations correlate with stepwise peak broadening in the austenite phase and are attributed to Portevin-Le Chatelier (PLC) band propagation. At -50 ºC, we then observe a more intense TRIP effect which suppresses PLC band formation and leads to a high ultimate tensile strength. In addition to the TRIP effect, we find that work hardening in the deformation-induced martensite phase plays an important role in the plastic stability at low temperature, by accommodating stress compatibility between grains and phases. Our studies provide the first direct experimental evidence for the existence of large stress concentrations in the austenite phase near the Luders band propagation front. These observations help to deepen understanding of the complex temperature-dependent micromechanical behaviors of advanced medium-Mn TRIP steels.},
doi = {10.1016/j.actamat.2017.09.030},
journal = {Acta Materialia},
number = [C],
volume = [141],
place = {United States},
year = {2017},
month = {9}
}

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