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中碳钢贝氏体在不同等温温度下转变动力学的研究

Study on Kinetics of Transformation in Medium Carbon Steel Bainite at Different Isothermal Temperatures.

作者信息

Pei Wei, Liu Wei, Zhang Yue, Qie Rongjian, Zhao Aimin

机构信息

Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China.

出版信息

Materials (Basel). 2021 May 21;14(11):2721. doi: 10.3390/ma14112721.

DOI:10.3390/ma14112721
PMID:34064167
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8196725/
Abstract

Ultra-fine carbide-free bainitic (UCFB) steel, also known as nano-bainite (NB) steel, is composed of bainitic ferrite laths with nanoscale thickness and carbon-rich film-like retained austenite located between laths. The bainite transformation kinetic model can accurately describe the bainite transformation kinetics in conventional austempering (CA) processes based on the shear mechanism combined with the dilatometer test. UCFB steels with medium and high carbon composition are designed in this work to systematically study the transformation kinetics of bainite, and the evolution of its microstructure and properties, and reveal the influence of heat treatment processes on the microstructure and properties the UCFB steels. The results show that the activation energy for BF nucleation decreases during the CA process and isothermal transformation temperature decreases. The bainite transformation is first nucleated at the grain boundaries, and then nucleated at the newly formed bainitic ferrite/austenite interface.

摘要

超细无碳化物贝氏体（UCFB）钢，也称为纳米贝氏体（NB）钢，由具有纳米级厚度的贝氏体铁素体板条和位于板条之间的富碳薄膜状残余奥氏体组成。贝氏体转变动力学模型可以基于剪切机制结合膨胀计试验，准确描述传统等温淬火（CA）过程中的贝氏体转变动力学。本文设计了中高碳成分的UCFB钢，以系统研究贝氏体的转变动力学及其组织和性能的演变，并揭示热处理工艺对UCFB钢组织和性能的影响。结果表明，在CA过程中，贝氏体铁素体形核激活能降低，等温转变温度降低。贝氏体转变首先在晶界形核，然后在新形成的贝氏体铁素体/奥氏体界面形核。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/10a0/8196725/7767a588e7bf/materials-14-02721-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/10a0/8196725/8f7f5fc4c4b0/materials-14-02721-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/10a0/8196725/8964e5303be8/materials-14-02721-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/10a0/8196725/fe05230bc1b2/materials-14-02721-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/10a0/8196725/99a260c8149a/materials-14-02721-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/10a0/8196725/52f77d0b2ad2/materials-14-02721-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/10a0/8196725/d5a685ce76d3/materials-14-02721-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/10a0/8196725/2998488bd9d2/materials-14-02721-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/10a0/8196725/7767a588e7bf/materials-14-02721-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/10a0/8196725/8f7f5fc4c4b0/materials-14-02721-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/10a0/8196725/8964e5303be8/materials-14-02721-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/10a0/8196725/fe05230bc1b2/materials-14-02721-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/10a0/8196725/99a260c8149a/materials-14-02721-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/10a0/8196725/52f77d0b2ad2/materials-14-02721-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/10a0/8196725/d5a685ce76d3/materials-14-02721-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/10a0/8196725/2998488bd9d2/materials-14-02721-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/10a0/8196725/7767a588e7bf/materials-14-02721-g008.jpg

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