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TWIP鋼的動(dòng)態(tài)力學(xué)性能及變形機(jī)制研究
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作者單位:

國(guó)防科技大學(xué)

作者簡(jiǎn)介:

通訊作者:

中圖分類號(hào):

TG142.1

基金項(xiàng)目:

國(guó)家自然科學(xué)基金資助（項(xiàng)目號(hào)5217083298）


Study on Dynamic Mechanical Properties and Deformation Mechanism of TWIP Steel
Author:
Affiliation:

National University of Defense Technology

Fund Project:

The National Natural Science Foundation of China (5217083298)

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    摘要:

    利用Zwick/Roell Z100萬(wàn)能材料試驗(yàn)機(jī)和Hopkinson拉桿對(duì)TWIP鋼進(jìn)行了準(zhǔn)靜態(tài)及動(dòng)態(tài)力學(xué)性能的研究?；诹W(xué)實(shí)驗(yàn)結(jié)果，修正了Johnson-Cook動(dòng)態(tài)本構(gòu)模型中應(yīng)變硬化項(xiàng)以及應(yīng)變強(qiáng)化項(xiàng)。采用X射線衍射(XRD)、掃描電鏡(SEM)、電子背散射衍射技術(shù)(EBSD)對(duì)TWIP鋼拉伸變形前后的組織進(jìn)行了觀察與分析。結(jié)果表明：TWIP鋼在準(zhǔn)靜態(tài)加載下表現(xiàn)為負(fù)應(yīng)變率敏感性，當(dāng)動(dòng)態(tài)加載時(shí)表現(xiàn)為正應(yīng)變率敏感性。在拉伸過(guò)程中，孿生誘發(fā)塑性是TWIP鋼的主要變形機(jī)制，同時(shí)滑移也起到了重要作用；動(dòng)態(tài)加載下TWIP鋼中形變孿晶的起始應(yīng)變和孿晶體積分?jǐn)?shù)均小于準(zhǔn)靜態(tài)加載過(guò)程；形變孿晶的生成以及孿晶相互作用導(dǎo)致的晶粒細(xì)化，使TWIP鋼兼具高強(qiáng)度、高塑性及高動(dòng)態(tài)吸能性能，在抗沖擊、抗爆領(lǐng)域具有廣泛的應(yīng)用前景。

    Abstract:

    The quasi-static and dynamic mechanical properties of TWIP steel were investigated by using Zwick/Roell Z100 universal testing machine and Hopkinson tensile bar. The strain hardening and strain strengthening in Johnson-Cook dynamic constitutive model were modified based on mechanical test results. The microstructure of TWIP steel before and after tensile deformation were analyzed by XRD, SEM and EBSD. The findings demonstrate that: When subjected to quasi-static loads, TWIP steel exhibits negative strain rate sensitivity and positive strain rate sensitivity when subjected to dynamic loads. Twinning induced plasticity is the primary deformation mechanism of TWIP steel during tensile process, and slip also plays a significant role. The initial strain and volume fraction of deformation twins in TWIP steel under dynamic loading are smaller than those under quasi-static loading. TWIP steel has exceptional strength and plasticity because deformation twins and the grain refinement brought on by twin contact, implying that it has a broad application in the fields of impact resistance and anti-explosion.

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馮新暢,劉希月,唐宇,白書(shū)欣,朱利安. TWIP鋼的動(dòng)態(tài)力學(xué)性能及變形機(jī)制研究[J].稀有金屬材料與工程,2023,52(5):1695~1707.[Feng Xinchang, Liu Xiyue, Tang Yu, Bai Shuxin, Zhu Li''an. Study on Dynamic Mechanical Properties and Deformation Mechanism of TWIP Steel[J]. Rare Metal Materials and Engineering,2023,52(5):1695~1707.]
DOI：10.12442/j. issn.1002-185X.20220813

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  • 收稿日期:2022-10-17
  • 最后修改日期:2022-12-12
  • 錄用日期:2022-12-30
  • 在線發(fā)布日期: 2023-06-08
  • 出版日期: 2023-05-29