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利用原位中子衍射对增材制造的316L不锈钢和CrCoNi中熵合金进行堆垛层错能分析。

Stacking Fault Energy Analyses of Additively Manufactured Stainless Steel 316L and CrCoNi Medium Entropy Alloy Using In Situ Neutron Diffraction.

作者信息

Woo W, Jeong J S, Kim D-K, Lee C M, Choi S-H, Suh J-Y, Lee S Y, Harjo S, Kawasaki T

机构信息

Neutron Science Center, Korea Atomic Energy Research Institute, Daejeon, 34057, Korea.

Materials Technology Development Team, Doosan heavy industries, Changwon, 44610, Korea.

出版信息

Sci Rep. 2020 Jan 28;10(1):1350. doi: 10.1038/s41598-020-58273-3.

DOI:10.1038/s41598-020-58273-3
PMID:31992801
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6987211/
Abstract

Stacking fault energies (SFE) were determined in additively manufactured (AM) stainless steel (SS 316 L) and equiatomic CrCoNi medium-entropy alloys. AM specimens were fabricated via directed energy deposition and tensile loaded at room temperature. In situ neutron diffraction was performed to obtain a number of faulting-embedded diffraction peaks simultaneously from a set of (hkl) grains during deformation. The peak profiles diffracted from imperfect crystal structures were analyzed to correlate stacking fault probabilities and mean-square lattice strains to the SFE. The result shows that averaged SFEs are 32.8 mJ/m for the AM SS 316 L and 15.1 mJ/m for the AM CrCoNi alloys. Meanwhile, during deformation, the SFE varies from 46 to 21 mJ/m (AM SS 316 L) and 24 to 11 mJ/m (AM CrCoNi) from initial to stabilized stages, respectively. The transient SFEs are attributed to the deformation activity changes from dislocation slip to twinning as straining. The twinning deformation substructure and atomic stacking faults were confirmed by electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). The significant variance of the SFE suggests the critical twinning stress as 830 ± 25 MPa for the AM SS 316 L and 790 ± 40 MPa for AM CrCoNi, respectively.

摘要

测定了增材制造（AM）不锈钢（SS 316L）和等原子CrCoNi中熵合金的堆垛层错能（SFE）。通过定向能量沉积制造AM试样，并在室温下进行拉伸加载。进行原位中子衍射，以便在变形过程中从一组（hkl）晶粒同时获得多个包含层错的衍射峰。分析从不完美晶体结构衍射的峰轮廓，以将堆垛层错概率和均方晶格应变与SFE相关联。结果表明，AM SS 316L的平均SFE为32.8 mJ/m，AM CrCoNi合金的平均SFE为15.1 mJ/m。同时，在变形过程中，SFE从初始阶段到稳定阶段分别从46至21 mJ/m（AM SS 316L）和24至11 mJ/m（AM CrCoNi）变化。瞬态SFE归因于应变时变形活动从位错滑移到孪生的变化。通过电子背散射衍射（EBSD）和透射电子显微镜（TEM）确认了孪生变形亚结构和原子堆垛层错。SFE的显著差异表明，AM SS 316L的临界孪生应力为830±25 MPa，AM CrCoNi的临界孪生应力为790±40 MPa。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2256/6987211/9ae5f3a40b94/41598_2020_58273_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2256/6987211/da971e85c3b8/41598_2020_58273_Fig1_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2256/6987211/a91ae32db224/41598_2020_58273_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2256/6987211/49d433072c7a/41598_2020_58273_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2256/6987211/50382ec716fb/41598_2020_58273_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2256/6987211/770427a84fdb/41598_2020_58273_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2256/6987211/9ae5f3a40b94/41598_2020_58273_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2256/6987211/da971e85c3b8/41598_2020_58273_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2256/6987211/0e6f2b8af3a1/41598_2020_58273_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2256/6987211/c15a097911b2/41598_2020_58273_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2256/6987211/a91ae32db224/41598_2020_58273_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2256/6987211/49d433072c7a/41598_2020_58273_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2256/6987211/50382ec716fb/41598_2020_58273_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2256/6987211/770427a84fdb/41598_2020_58273_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2256/6987211/9ae5f3a40b94/41598_2020_58273_Fig8_HTML.jpg

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