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相间析出对耐火钢在高温下力学行为的影响。

The Impact of Interphase Precipitation on the Mechanical Behavior of Fire-Resistant Steels at an Elevated Temperature.

作者信息

Cong Jinghua, Li Jiangwen, Fan Jiajie, Liu Pengcheng, Misra Raja Devesh Kumar, Shang Chengjia, Wang Xuemin

机构信息

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

Laboratory for Excellence in Advanced Steel Research, Department of Metallurgical, Materials and Biomedical Engineering, University of Texas at El Paso, 500 W. University Avenue, El Paso, TX 79968, USA.

出版信息

Materials (Basel). 2020 Sep 25;13(19):4294. doi: 10.3390/ma13194294.

DOI:10.3390/ma13194294
PMID:32992969
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7579236/
Abstract

In this study, we address the challenge of obtaining high strength at ambient and elevated temperatures in fire-resistant Ti-Mo-V steel with ferrite microstructures through thermo-mechanical controlled processing (TMCP). Thermally stable interphase precipitation of (Ti, Mo, V)C was an important criterion for retaining strength at elevated temperatures. Electron microscopy indicated that interphase precipitation occurred during continuous cooling after controlled rolling, where the volume fraction of interphase precipitation was controlled by the laminar cooling temperature. The interphase precipitation of MC carbides with an NaCl-type crystal structure indicated a Baker-Nutting (B-N) orientation relationship with ferrite. When the steel was isothermally held at 600 °C for up to 3 h, interphase precipitation occurred during TMCP with high thermal stability. At the same time, some random precipitation took place during isothermal holding. The interphase precipitation increased the elastic modulus of the experimental steels at an elevated temperature. It is proposed that fire-resistant steel with thermally stable interphase precipitation is preferred, which enhances precipitation strengthening and dislocation strengthening at elevated temperatures.

摘要

在本研究中，我们应对了通过热机械控制轧制（TMCP）在具有铁素体微观结构的耐火Ti-Mo-V钢中在室温和高温下获得高强度的挑战。（Ti, Mo, V）C的热稳定相间沉淀是在高温下保持强度的重要标准。电子显微镜表明，相间沉淀发生在控制轧制后的连续冷却过程中，其中相间沉淀的体积分数由层流冷却温度控制。具有NaCl型晶体结构的MC碳化物的相间沉淀表明与铁素体存在贝克-纳廷（B-N）取向关系。当钢在600℃等温保持长达3小时时，在具有高热稳定性的TMCP过程中发生相间沉淀。同时，在等温保持过程中发生了一些随机沉淀。相间沉淀提高了实验钢在高温下的弹性模量。建议优先选择具有热稳定相间沉淀的耐火钢，这在高温下增强了沉淀强化和位错强化。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca80/7579236/e131bd8c68e4/materials-13-04294-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca80/7579236/96a23ff4f75f/materials-13-04294-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca80/7579236/fb75a26143e4/materials-13-04294-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca80/7579236/37d9df9f33dd/materials-13-04294-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca80/7579236/c9f5edd7ef95/materials-13-04294-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca80/7579236/6b08e28c086b/materials-13-04294-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca80/7579236/e482f767f83f/materials-13-04294-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca80/7579236/48e533eaacbc/materials-13-04294-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca80/7579236/3753fcb7e544/materials-13-04294-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca80/7579236/6804a6993681/materials-13-04294-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca80/7579236/e131bd8c68e4/materials-13-04294-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca80/7579236/96a23ff4f75f/materials-13-04294-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca80/7579236/fb75a26143e4/materials-13-04294-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca80/7579236/37d9df9f33dd/materials-13-04294-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca80/7579236/c9f5edd7ef95/materials-13-04294-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca80/7579236/6b08e28c086b/materials-13-04294-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca80/7579236/e482f767f83f/materials-13-04294-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca80/7579236/48e533eaacbc/materials-13-04294-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca80/7579236/3753fcb7e544/materials-13-04294-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca80/7579236/6804a6993681/materials-13-04294-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca80/7579236/e131bd8c68e4/materials-13-04294-g010.jpg

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