形變過程中TRIP效應的相變熱動態研究

高緒濤; 趙愛民

doi:10.13374/j.issn2095-9389.2018.01.008

形變過程中TRIP效應的相變熱動態研究

doi: 10.13374/j.issn2095-9389.2018.01.008

高緒濤^1,2, ,,
趙愛民³

1) 北京交通大學機械與電子控制工程學院, 北京 100044
2) 北京市地鐵運營有限公司地鐵運營技術研發中心, 北京 102208
3) 北京科技大學鋼鐵共性技術協同創新中心, 北京 100083

詳細信息

中圖分類號: TG115.2
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出版歷程
- 收稿日期: 2017-05-30

Dynamic study on phase-change heat of TRIP effect during deformation

GAO Xu-tao^{1,2
, ,},
ZHAO Ai-min³

1) College of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
2) Subway Operation Technology Center, Beijing Mass Transit Railway Operation Corporation Ltd, Beijing 102208, China
3) Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China

摘要

摘要: 采用拉伸與測溫試驗同時進行的方法，將應力應變曲線與熱能曲線相結合，動態研究熱軋TRIP鋼拉伸過程中的相變熱.研究表明：熱軋TRIP鋼在拉伸過程中材料增加的熱能由部分轉變的塑性功和馬氏體相變熱組成，因此，拉伸過程中實際測得的試樣熱能高于由塑性功轉變的熱能.利用平均綜合熱能損失系數對低速拉伸的TRIP鋼的熱能進行補充，通過計算與推導，證實了試樣在剛進入塑性變形時，一定數量的較不穩定殘余奧氏體首先集中發生馬氏體相變，隨著應變的進一步加大，剩余的較穩定的殘余奧氏體根據其穩定情況發生馬氏體相變的數量逐漸減少，在試樣均勻延伸結束前絕大部分殘余奧氏體已轉變為馬氏體.結合相變熱變化可動態描述熱軋TRIP鋼形變過程中馬氏體相變的情況.
- 熱軋TRIP鋼 /
- 殘余奧氏體 /
- 塑性變形 /
- 相變熱 /
- 拉伸
Abstract: During tensile and temperature tests, the latent heat of hot-rolled TRIP steel was dynamically investigated by observing the stress-strain and thermal curves. The results indicated that during the tensile test, the hot-rolled TRIP steel increased the thermal energy, which originated from the partial transformation of plastic work and martensitic transformation. Therefore, the actual heat of the measured sample was higher than that converted by plastic work. During the low speed tensile test, the thermal energy of the TRIP steel was supplemented by the average integrated heat loss coefficient. Through calculation and deduction, it was confirmed that a certain amount of the unstable residual austenite first became martensite, when the plastic deformation had just begun. As the strain increased further, the amount of the remaining, stable, retained austenite that would become martensite, decreased gradually according to its stability. Most of the retained austenite had almost become martensite before the end of the uniform elongation. During the deformation process of the hot rolled TRIP steel, the martensitic transformation could be dynamically described by the change of latent heat.
- hot-rolled TRIP steels /
- retained austenite /
- plastic deformation /
- phase-change heat /
- tensile

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