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Redistribution of C and N atoms in High Nitrogen Martensitic Stainless Steel During Cryogenic Treatment

Acta Metallurgica Sinica(English Letters) 2022年第4期35卷 591-595页

作者： Xin Cai Xiaoqiang Hu Leigang Zheng Dianzhong Li University of Chinese Academy of Sciences Beijing 100049China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The redistribution of C and N atoms during cryogenic treatment is crucial for the microstructure evolution and properties of high nitrogen martensitic ***,the distinct redistribution behavior of C and N atoms in a martensitic stainless steel with 0.3 wt%C and 0.5 wt%N after cryogenic treatment were investigated by the atom probe *** clusters begin to form after cryogenic treatment at-60℃and gradually increase with the decrease of cryogenic treatment *** Mo–N and Cr–N pairs are homogeneously distributed in the matrix even after cryogenic treatment at-120℃,and then form enrichment phenomenon when the cryogenic temperature is deeply lowered to-190℃.It is found that the distinct redistributions of C and N atoms are associated with the different interaction energy between substitutional atoms and *** stronger interaction between Cr,Mo atoms and N delays the segregation of N during the cryogenic ***,the mechanical properties results confirmed that the deep lower cryogenic treatment is a promising method to improve the hardness and strength in the high nitrogen martensitic stainless steel.

关键词： interstitial atom Cryogenic treatment Martensitic stainless steel atom probe tomography

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Residual compressive stress and intensity of infrared absorption of cubic BN films prepared by plasma enhanced chemical vapor deposition

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Chinese Physics B 2014年第3期23卷 475-481页

作者：杨杭生金盼盼徐亚伯李海洋 State Key Laboratory of Silicon Materials Department of Materials Science and Engineering Zhejiang University Department of Physics Zhejiang University

Theoretical and experimental investigations on the dependence of the intensity of infrared （IR） absorption of poly- crystalline cubic boron nitride thin films under the residual compressive stress conditions have been performed. Our results indicate that the intensity of the IR absorption is proportional to the total degree of freedom of all the ions in the ordered regions. The reduction of interstitial Ar atom concentration, which causes the increase in the ordered regions of cubic boron nitride （cBN） crystallites, could be one cause for the increase in the intensity of IR absorption after residual compressive stress relaxation. Theoretical derivation is in good agreement with the experimental results concerning the IR absorption intensity and the Ar interstitial atom concentration in cubic boron nitride films measured by energy dispersion X-ray spec- troscopy. Our results also suggest that the interstitial Ar is the origin of residual compressive stress accumulation in plasma enhanced cBN film deposition.

关键词： infrared absorption compressive stress degree of freedom interstitial atom

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atomistic simulation of interactions of fracture with defect clusters in delta-Pu

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Science China(Physics,Mechanics & Astronomy) 2011年第10期54卷 1805-1810页

作者： LI RuSong HE Bin ZHANG QuanHu Xi'an Research Institute of High Technology Xi' an 710025 China

The Pu-He pair potential fitted by ab initio data, and the Pu-Pu and He-He modified embedded atom method (MEAM) poten-tials have been implemented to perform multi-scale simulations for the interactions of fracture with the self-interstitial atom(SIA), He interstitial atom and He-vacancy clusters. The simulation results indicate that Pu atoms around the fracture agglom-erate into an elliptic self-interstitial loop. interstitial He atoms evolve into separate interstitial atoms, small He atom clustersand some substitutional He atoms. The He-vacancy cluster forms a spheric structure with a 1:1 He-to-vacancy ratio. Finally,the existence of self-interstitial atoms will lead to the local change of Pu lattice and an increasing disorder, and the wholesimulation cell shows a melting state at about 10.0 ps.

关键词： ab initio modified embedded atom method molecular dynamics interstitial atom

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Study on Precipitation in 1Cr22Mn15N Stainless Steel

Study on Precipitation in 1Cr22Mn15N Stainless Steel

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高氮钢国际会议

作者： Ma Yuxi, Rong Fan, Lang Yuping, Zhou Rong, Jiang Yehua (Central Iron & Steel Research Institute, Beijing, 100081, China Kunming University of Science and Technology Faculty of Mechanical and Electrical Engineering, Kunming, 650011, China)

＜正＞Influence of temperature and time on precipitation of nitrides and carbides, which occurs in solution treatment and aging process of 1Cr22Mn15N stainless steel, was investigated by the use of metallography and electron microscopy analysis. The results show that Cr23C6 precipitates in 1Cr22Mn15N stainless steel, growing from grain boundaries into intragrain, show various morphologies in the investigated temperature range, including granular-like, worm-like, layer by layer and chrysanthemum-like. In contrast,σ-phase precipitates are just granular-like particles. The corresponding isothermal precipitation kinetics curves of nitrides and carbides have been measured respectively. The nose-top temperature for Cr23C6 precipitation is about 850℃ with incubation time of 90-120 s. Precipitates were seldom observed over 950℃ or when the cooling rate is higher than 3.3℃/s. Most of precipitates are Cr23C6. With the increasing ageing time, the size and volume fraction of Cr23C6 precipitates increases and a small amount of σ-phase also starts to precipitate out. Nitrogen is either to form Cr23（C,N）6 and or solute in matrix as supersaturated interstitial atoms.

关键词： 1Cr22Mn15N stainless steel solution treatment aging process isothermal precipitation kinetics interstitial atom

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