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Effect of W on formation and properties of precipitates in Ni-based superalloys

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Journal of Iron and Steel Research International 2021年第7期28卷 910-919页

作者： Zhi-hua Gong Yuan-yuan Ma han-sheng bao Gang Yang Inner Mongolia University of Science and Technology Baotou 014010Inner MongoliaChina Institute for Special Steels Central Iron and Steel Research InstituteBeijing 100081China

The formation and properties of precipitates in wrought Ni-based superalloys with different W contents during long-term exposure to high temperatures were *** scanning electron microscope,transmission electron microscope,and chemical phase analysis were used to investigate the formation and properties of *** is found that with increasing W content,the quantity and thermal stability of MC carbide in Ni-based superalloys increased,while the quantity of M_(23)C_(6)carbides *** the results show,W has a higher partition coefficient in γ'-and γ-matrix,and the addition of W promotes the precipitation of γ'phase.W content has no significant effect on the morphology,size,crystal structure,and coarsening rate of γ'*** influence of W content on high-temperature tensile and creep properties of the alloys was *** results showed that W content has no obvious influence on the high-temperature yield strength,but the elongation and area reduction decreased significantly when the addition of W was more than 4 wt.%.Because of the similar volume fractions of γ'phase,the creep fracture strengths in the tested alloys with lower W concentrations were not significantly different after long-term exposure at 700℃.

关键词： Ni-based superalloy W content Waspaloy alloy Heat resistance MC carbide

Evolution of precipitates in Ni-Co-Cr-W-Mo superalloys with different tungsten contents

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Rare Metals 2020年第6期39卷 716-724页

作者： han-sheng bao Zhi-Hua Gong Zheng-Zong Chen Gang Yang Institute for Special Steels Central Iron and Steel Research InstituteBeijing 100081China School of Materials and Metallurgy Inner Mongolia University of Science and TechnologyBaotou 014010China

The Ni-Co-Cr-W-Mo system is critical for the design of nickel-based *** system stabilizes different topologically close-packed(TCP)phases in many commercially superalloys with high W and Mo *** electron microscopy(SEM),transmission electron microscopy(TEM)and thermodynamic calculations were applied to investigate the thermodynamics of the precipitates in two different W-contained Ni-Co-Cr-WMo superalloys(Alloy 1 and Alloy 2).Computational thermodynamics verifies the experimental observation of theμphase formation as a function of temperature and alloy chemistry,but the kinetics for the precipitation of the M6 C phase do not agree with the experimental *** major precipitates of Alloy 1 at temperatures of700℃and 750℃during long-time exposure are M23 C6,γ′phase and MC;for Alloy 2,they are M23 C6,γ′phase,MC,M6 C andμphase.W addition is found to promote the precipitation of M6 C andμphase during exposure.M6 C has higher W and lower Ni content thanμphase,whereas M6 C is an unstable phase that would transform into M12 C after 5000-h exposure at 750℃.A great quantity of needle-likeμphases precipitated after exposure at 750℃for5000 h,which have no effect on the impact properties of Alloy 2.

关键词： Nickel-based superalloys M6C μphase Long-time exposure M12C

Effect of Mo and cold forging deformation on strength and ductility of cobalt-based alloy L605

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Journal of Iron and Steel Research International 2024年第7期31卷 1811-1823页

作者： Zhong-lin Wang Zhi-hua Gong Quan Li han-sheng bao School of Materials and Metallurgy Inner Mongolia University of Science and TechnologyBaotou 014017Inner MongoliaChina Institute of Special Steels Central Iron and Steel Research Institute Co.Ltd.Beijing 100081China

Mo element was added to cobalt-based alloy L605,and cold forging deformation was *** effects of the addition and cold forging deformation on the microstructure and mechanical properties of the alloy were studied by thermodynamic calculation,electron backscatter diffraction,transmission electron microscopy,and X-ray *** stacking fault energy(SFE)of the alloy decreased after the addition,and the formation of stacking faults and intersections were promoted to improve the strength and *** tensile strength of the alloy with Mo increased from 1190 to 1702 MPa after 24%cold deformation,producing significant work *** strengthening mechanism is strain-induced martensitic transformation(SIMT)and deformation *** alloy,combined with Mo and after 24%deformation,had both high strength and ductility in comparison with the original cobalt-based alloy *** is attributed to the lower SFE which caused the increase in stacking fault *** the tensile process,theε-hcp phase was easily generated at the stacking fault to reduce the stress concentration and increase the *** SIMT by adjusting the density of stacking faults can improve the mechanical properties of cobalt-based ***ε-hcp phase,the interaction between deformation twins and dislocations,and the interaction between e-hcp phases during cold forging deformation caused local stress concentration,lowering ductility and toughness.

关键词： Cobalt-based alloy-Stacking fault energy Strain-induced martensitic transformation Deformation twin Cold forging deformation

Microstructural evolution and mechanical properties of a new Ni-based heat-resistant alloy during aging at 750℃

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Journal of Iron and Steel Research International 2017年第5期24卷 513-519页

作者： Zhong-liang Tian Sen-bao Jiang Zheng-zong Chen han-sheng bao Zheng-dong Liu Institute for Special Steels Central Iron and Steel Research Institute College of Material Science & Engineering Taiyuan Science & Technology University

Microstructural evolution and mechanical properties of a new candidate Ni-based heat-resistant alloy for advanced ultra-supercritical （A-USC） steam turbine rotors were investigated during aging at 750℃ up to 10000 h. The evolutions of γ＇ particles inside austenitic grain and M_23 C_6 carbides along grain boundaries were characterized according to their morphologies, distributions, and growth kinetics. Mean radius of the γ＇ spherical particles grew from 20.3 to 90.0 nm after aging for 10000 h, and;the corresponding coarse- ning behavior was conformed to the law of Lifschitz-Slyosovd-Wagner （LSW）. The weight fraction of γ＇ particles slightly increased from 10.0 to 12.0 wt. % after aging of long duration at 750 ℃.The Cr-rich M_23C_6 carbides discontinuously precipitated along grain boundaries, while other detrimental phases were not formed during the aging treatment, and hence the strength of grain boundary was enhanced by these discontinuously distributed carbides. The critical size of γ＇ had a direct influence on the maximum hardness of this alloy. Moreover, this alloy presented a good impact toughness for the safety after long time aging at high temperature.

关键词： Aging Precipitation Microstruetural evolution Mechanical property Heat-resistant alloy

Effect of removing Al and Ti elements on peak flow stress of nickel-based heat-resistant alloy 617

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Journal of Iron and Steel Research International 2023年第2期30卷 384-391页

作者： Chen Dong Zheng-zong Chen Zheng-dong Liu han-sheng bao Zhen Liu Zheng-jun Wang Faculty of Mechanical and Material Engineering Huaiyin Institute of TechnologyHuaian223003JiangsuChina Jiangsu Key Laboratory of Advanced Manufacturing Technology Huaiyin Institute of TechnologyHuaian223003JiangsuChina Institute for Special Steels Central Iron and Steel Research Institute Co.Ltd.Beijing100081China

The hot deformation behavior and the microstructure characteristics of alloy 617 and alloy C-HRA-2 were compared and *** removal of Al and Ti elements has a significant change in the hot deformation of the alloy,and there are two opposite effects on the flow stress before and after *** results show that the removal of Al and Ti elements increases the flow stress of the alloy under high temperature or low strain rate deformation *** is mainly due to the increase in the stacking fault energy of the alloy so that the alloy contains a higher twin boundary fraction after dynamic recrystallization(DRX).However,before DRX occurs,that is,at low temperature and high strain rate,the flow stress of this alloy is relatively *** is due to the reduction in Peierls-Nabarro stress,making the alloy more prone to dislocation slip.

关键词： Peak flow stress Nickel-based heat-resistant alloy Slip band Stacking fault energy

Characterization and numerical simulation of nucleation-growth-coarsening kinetics of precipitates in G115 martensitic heat resistance steel during long-term aging

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Journal of Iron and Steel Research International 2023年第6期30卷 1279-1290页

作者： Yun-he Yu Zheng-dong Liu Zhen Liu Zheng-zong Chen han-sheng bao Chi Zhang Zhi-gang Yang Shagang School of Iron and Steel Soochow UniversitySuzhou 215137JiangsuChina Key Laboratory for Advanced Materials of Ministry of Education School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Research Institute of Special Steels Central Iron and Steel Research InstituteBeijing 100081China

The service performance of heat resistance steels is largely determined by the precipitation *** nucleation-growth-coarsening behaviors of precipitates in G115 martensitic heat resistance steel during long-term aging at 650℃ have been systemically *** microstructural characteristics,precipitate morphology and alloying element distribution were studied by scanning electron microscopy,transmission electron microscopy and scanning transmission electron *** lognormal distribution fitting combined with the multiple regression analysis was adopted to evaluate the precipitate size *** phase has longer incubation time,and its coarsening rate is almost one order of magnitude higher in comparison with that of M_(23)C_(6) ***,the nucleation rate,number density,average radius,and volume fraction of two precipitates are simulated based on the classical nucleation theory and the modified Langer-Schwartz *** precipitation behavior of Laves phase can be well explained with the Fe-W system as the interfacial energy takes 0.10 J/m^(2).In contrast,the simulation results of M_(23)C_(6) carbide in the Fe-Cr-C system are significantly overestimated,which results from the inhibitory effect of boron on coarsening.

关键词： Nucleation Growth Coarsening Precipitation kinetics G115 heat resistance steel Long-term aging

Impacts of multiple laser shock processing on microstructure and mechanical property of high-carbon steel

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Journal of Iron and Steel Research International 2018年第4期25卷 469-475页

作者： Yi Xiong Tian-tian He Yan Lu han-sheng bao Yong Li Feng-zhang Ren Wei Cao Alex A. Volinsky School of Materials Science and Engineering Henan University of Science and Technology Luoyang 471023 Henan China Collaborative Innovation Center of Nonferrous Metals Luoyang 471023 Henan China Institute for Special Steels Central Iron and Steel Research Institute Beijing 100081 China Nano and Molecular Systems Research Unit University of Oulu 90014 Oulu Finland School of Mechanical and Automotive Engineering Anhui Polytechnic University Wuhu 241000 Anhui China Department of Mechanical Engineering University of South Florida Tampa FL 33620 USA

Multiple laser shock processing （LSP） impacts on microstructures and mechanical properties were investigated through morphological determinations and hardness testing. Microscopic results show that without equal channel angular pressing （ECAP）, the LSP-treated lamellar pearlite was transferred to irregular ferrite matrix and incompletely broken cementite particles. With ECAP, LSP leads to refinements of the equiaxed ferrite grain in ultrafine-grained microduplex structure from 400 to 150 nm, and the completely spheroidized cementite particles from 150 to 100 nm. Consequentially, enhancements of mechanical properties were found in strength, microhardness and elongations of samples consisting of lamellar pearlite and ultrafine-grained microduplex structure. After LSP, a mixture of quasi-cleavage and ductile fracture was formed, different from the typical quasi-cleavage fracture from the original lamellar pearlite and the ductile fracture of the microduplex structure.

关键词： Laser shock processing High-carbon steel Ultrafine-grained microduplex structure Mechanical property

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折返装置在煤矿可伸缩带式输送机上的应用

煤矿机械 2010年第12期31卷 165-166页

作者：韩宝生宝鸡杭叉工程机械有限责任公司陕西宝鸡721004

介绍了折返装置在煤矿可伸缩带式输送机中的应用,叙述其设计要点及工作原理、安装布置方式、维护保养注意事项。使用结果表明,该装置简单实用,能有效防止飘带,适合在4～12°变坡的综采工作面巷道使用。

关键词：带式输送机折返装置防止飘带

韩流汉风话孙武——“孙子兵法全球行”韩国情况报告

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滨州学院学报 2014年第5期30卷 84-91页

作者：韩胜宝中国新闻社江苏分社江苏苏州125128

朝鲜半岛的文化很多方面受中国影响,中国汉字很长时间内是朝鲜唯一的书写文字,朝鲜五科考试《孙子兵法》列入其中,中国兵书传入朝鲜可能早于日本。朝鲜时代的知识分子把孙子思想作为哲学来学习,如今这部世界第一兵书创下韩国出版史的最... 详细信息

朝鲜半岛的文化很多方面受中国影响,中国汉字很长时间内是朝鲜唯一的书写文字,朝鲜五科考试《孙子兵法》列入其中,中国兵书传入朝鲜可能早于日本。朝鲜时代的知识分子把孙子思想作为哲学来学习,如今这部世界第一兵书创下韩国出版史的最高纪录,在韩国的普及率非常高,广泛应用于社会文化生活领域,影响一代又一代韩国人。韩国企业家崇拜孙武和毛泽东,用兵法创造"汉江奇迹",掀起了"孙子经营学"的热潮。韩国学者用孙子精髓诠释中韩军事关系,应对朝鲜半岛局势,构建和谐世界。

关键词：《孙子兵法》 “孙子兵法全球行” 韩国政治经济