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微观结构对先进压力容器用钢 SA508Gr.4N 的冲击韧性和回火脆性的影响。

Effect of microstructure on the impact toughness and temper embrittlement of SA508Gr.4N steel for advanced pressure vessel materials.

机构信息

Institute for Special Steels, Central Iron and Steel Research Institute Group, Beijing, 100081, China.

出版信息

Sci Rep. 2018 Jan 9;8(1):207. doi: 10.1038/s41598-017-18434-3.

DOI:10.1038/s41598-017-18434-3
PMID:29317686
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5760566/
Abstract

The effect of microstructure on the impact toughness and the temper embrittlement of a SA508Gr.4N steel was investigated. Martensitic and bainitic structures formed in this material were examined via scanning electron microscopy, electron backscatter diffraction, transmission electron microscopy, and Auger electron spectroscopy (AES) analysis. The martensitic structure had a positive effect on both the strength and toughness. Compared with the bainitic structure, this structure consisted of smaller blocks and more high-angle grain boundaries (HAGBs). Changes in the ultimate tensile strength and toughness of the martensitic structure were attributed to an increase in the crack propagation path. This increase resulted from an increased number of HAGBs and refinement of the sub-structure (block). The AES results revealed that sulfur segregation is higher in the martensitic structure than in the bainitic structure. Therefore, the martensitic structure is more susceptible to temper embrittlement than the bainitic structure.

摘要

研究了微观组织对 SA508Gr.4N 钢冲击韧性和回火脆性的影响。通过扫描电子显微镜、电子背散射衍射、透射电子显微镜和俄歇电子能谱（AES）分析对该材料中的马氏体和贝氏体组织进行了检查。马氏体组织对强度和韧性都有积极的影响。与贝氏体组织相比，该组织由更小的块和更多的高角度晶界（HAGB）组成。马氏体组织的极限拉伸强度和韧性的变化归因于裂纹扩展路径的增加。这是由于 HAGB 的数量增加和子结构（块）的细化所致。AES 结果表明，马氏体组织中的硫偏析比贝氏体组织高。因此，马氏体组织比贝氏体组织更容易发生回火脆性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7328/5760566/9b0d5ce19c25/41598_2017_18434_Fig11_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7328/5760566/32d9216c39b0/41598_2017_18434_Fig1_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7328/5760566/671ed20f4198/41598_2017_18434_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7328/5760566/9e16bcd51252/41598_2017_18434_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7328/5760566/eaa7a21d1569/41598_2017_18434_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7328/5760566/c312343b513e/41598_2017_18434_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7328/5760566/8a661cd2e91e/41598_2017_18434_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7328/5760566/33efa6213721/41598_2017_18434_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7328/5760566/9b0d5ce19c25/41598_2017_18434_Fig11_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7328/5760566/32d9216c39b0/41598_2017_18434_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7328/5760566/61e3d51ba7e6/41598_2017_18434_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7328/5760566/b6dc62b0a900/41598_2017_18434_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7328/5760566/3bf2332532a2/41598_2017_18434_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7328/5760566/671ed20f4198/41598_2017_18434_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7328/5760566/9e16bcd51252/41598_2017_18434_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7328/5760566/eaa7a21d1569/41598_2017_18434_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7328/5760566/c312343b513e/41598_2017_18434_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7328/5760566/8a661cd2e91e/41598_2017_18434_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7328/5760566/33efa6213721/41598_2017_18434_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7328/5760566/9b0d5ce19c25/41598_2017_18434_Fig11_HTML.jpg

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