Kinetic transitions and Mn partitioning during austenite growth from a mixture of partitioned cementite and ferrite: Role of heating rate

被引：44
作者：
Liu, Geng [1 ]
Dai, Zongbiao [1 ]
Yang, Zhigang [1 ]
Zhang, Chi [1 ]
Li, Jun [2 ]
Chen, Hao [1 ]
机构：
[1] Tsinghua Univ, Sch Mat Sci & Engn, Key Lab Adv Mat, Minist Educ, Beijing 100084, Peoples R China
[2] Res Inst Baoshan Iron & Steel Co Ltd, Shanghai 201900, Peoples R China
来源：
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2020年 / 49卷
基金：
北京市自然科学基金; 中国国家自然科学基金; 中国博士后科学基金;
关键词：
Cementite; Austenite; Kinetics; Elements partitioning; Fast heating; AS-QUENCHED MARTENSITE; PHASE-TRANSFORMATIONS; ALLOYING ELEMENTS; MICROSTRUCTURE; PEARLITE; STEEL; BEHAVIOR; SI;
D O I：
10.1016/j.jmst.2020.01.051
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Austenite formation from a ferrite-cementite mixture is a crucial step during the processing of advanced high strength steels (AHSS). The ferrite-cementite mixture is usually inhomogeneous in both structure and composition, which makes the mechanism of austenite formation very complex. In this contribution, austenite formation upon continuous heating from a designed spheroidized cementite structure in a model Fe-C-Mn alloy was investigated with an emphasis on the role of heating rate in kinetic transitions and element partitioning during austenite formation. Based on partition/non-partition local equilibrium (PLE/NPLE) assumption, austenite growth was found alternately contribute by PLE, NPLE and PLE controlled interfaces migration during slow-heating, while NPLE mode predominately controlled the austenitization by a synchronous dissolution of ferrite and cementite upon fast-heating. It was both experimentally and theoretically found that there is a long-distance diffusion of Mn within austenite of the slow-heated sample, while a sharp Mn gradient was retained within austenite of the fast-heated sample. Such a strong heterogeneous distribution of Mn within austenite cause a large difference in driving force for ferrite or martensite formation during subsequent cooling process, which could lead to various final microstructures. The current study indicates that fast-heating could lead to unique microstructures which could hardly be obtained via the conventional annealing process. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
引用
收藏
页码：70 / 80
页数：11
相关论文
共 37 条
  • [1] Vessel microstructure design: A new approach for site-specific core-shell micromechanical tailoring of TRIP-assisted ultra-high strength steels
    Belde, M.
    Springer, H.
    Raabe, D.
    [J]. ACTA MATERIALIA, 2016, 113 : 19 - 31
  • [2] Multiphase microstructures via confined precipitation and dissolution of vessel phases: Example of austenite in martensitic steel
    Belde, M.
    Springer, H.
    Inden, G.
    Raabe, D.
    [J]. ACTA MATERIALIA, 2015, 86 : 1 - 14
  • [3] Microstructure, texture and mechanical properties in a low carbon steel after ultrafast heating
    Castro Cerda, F.
    Goulas, C.
    Sabirov, I.
    Papaefthymiou, S.
    Monsalve, A.
    Petrov, R. H.
    [J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2016, 672 : 108 - 120
  • [4] ARPGE:: a computer program to automatically reconstruct the parent grains from electron backscatter diffraction data
    Cayron, Cyril
    [J]. JOURNAL OF APPLIED CRYSTALLOGRAPHY, 2007, 40 : 1183 - 1188
  • [5] Analysis of the stagnant stage in diffusional phase transformations starting from austenite-ferrite mixtures
    Chen, Hao
    Goune, Mohamed
    van der Zwaag, Sybrand
    [J]. COMPUTATIONAL MATERIALS SCIENCE, 2012, 55 : 34 - 43
  • [6] Application of cyclic partial phase transformations for identifying kinetic transitions during solid-state phase transformations: Experiments and modeling
    Chen, Hao
    Appolaire, Benoit
    van der Zwaag, Sybrand
    [J]. ACTA MATERIALIA, 2011, 59 (17) : 6751 - 6760
  • [7] The influence of ultra-fast annealing prior to quenching and partitioning on the microstructure and mechanical properties
    De Knijf, Dorien
    Puype, Athina
    Fojer, Cecilia
    Petrov, Roumen
    [J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2015, 627 : 182 - 190
  • [8] Effect of pre-existed austenite on austenite reversion and mechanical behavior of an Fe-0.2C-8Mn-2Al medium Mn steel
    Ding, Ran
    Dai, Zongbiao
    Huang, Mingxin
    Yang, Zhigang
    Zhang, Chi
    Chen, Hao
    [J]. ACTA MATERIALIA, 2018, 147 : 59 - 69
  • [9] Austenite growth and stability in medium Mn, medium Al Fe-C-Mn-Al steels
    Emo, Jonathan
    Maugis, Philippe
    Perlade, Astrid
    [J]. COMPUTATIONAL MATERIALS SCIENCE, 2016, 125 : 206 - 217
  • [10] Partition and non-partition transition of austenite growth from a ferrite and cementite mixture in hypo- and hypereutectoid Fe-C-Mn alloys
    Enomoto, M.
    Li, S.
    Yang, Z. N.
    Zhang, C.
    Yang, Z. G.
    [J]. CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY, 2018, 61 : 116 - 125
1234