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Journal of Iron and Steel Research International 2021年第7期28卷 842-852页

作者： Tao Peng Bin Yang Gang Yang Lu Wang Zhi-hua Gong Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Huadian Electric Power Research Institute Co. LtdHangzhou 310030ZhejiangChina

Microstructural change,stress rupture property,deformation and fracture mechanisms of Nimonic 105 superalloy at 750℃have been *** results showed that the stress rupture strength of the alloy at 750℃ for 10^(5)h is about 200 MPa.γ'precipitates and M_(23)C_(6)carbides grew gradually with prolonging the rupture time,while no significant change was observed in MC carbide *** stress rupture test at 750℃ and 250 MPa for 23,341 h,a transition from spherical to cuboidal morphology of γ'precipitates was found,and nearly continuous chains of M_(23)C_(6)carbides formed on the grain *** looping and strongly coupled dislocation pairs cutting and microtwinning were the dominant deformation mechanisms at 750℃ and 350-450 MPa,while the main deformation mode was Orowan looping at 750℃ and 250 *** failure of the alloy was mainly attributed to the nucleation,growth and interlinkage of voids.

关键词： Nimonic 105 superalloy Ni-based superalloy Microstructural change stress rupture property Deformation mechanism

Effect of γ' formation and strengthening elements on microstructures and stress rupture property of single crystal super-alloys

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China Foundry 2010年第3期7卷 265-269页

作者： Liu Lirong Chen Haijun Jin Tao Sun Xiaofeng Guan Hengrong Hu Zhuangqi Materials Science and Engineering School Shenyang University of Technology Shenyang 110023 China Department of Superalloy Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China General Machinery Plant of Liaohe Petroleum Exploration Bureau China

An investigation was carried out to study the effects of γ' formation and strengthening elements (Al, Ti and Ta) on the microstructure and stress rupture properties of nickel base single crystal *** results show that with the increase of γ' formation and strengthening elements, the percentage of γ-γ' eutectic and the misfit degree of γ/γ' *** microstructural analysis revealed that with the increase of γ' forming element content, the morphology of γ' changed from spherical to cubic, then irregular shape; and the size of γ' increases *** γ' formation and strengthening elements will lead to the precipitation of μ phase during stress rupture *** alloy with 5wt.%Al, 1wt.%Ti and 6wt.%Ta has the best stress rupture property.

关键词： γ' phase microstructures stress rupture property single crystal super-alloy

Anisotropic Creep rupture Properties of a Nickel-base Single Crystal Superalloy at High Temperature

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Journal of Materials Science & Technology 2011年第2期27卷 107-112页

作者： Shaohua Zhang Jian Zhang Langhong Lou Superalloys Division Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The creep rupture properties of a single crystal superalloy were tested at 975℃/255 MPa as a function of the deviation degrees from [001].The misorientation of the specimens away from [001] distributed approximately along a line between [001]-[011] and [001]-[111] boundaries in the triangle of the stereographic *** rupture lifetimes of the specimens were not sensitive to the misorientation until the deviation degree exceeded ～30 *** steps of lattice rotation were found in all specimens during creep,first towards the [001]-[111] boundary,and then to [001] or [111] along the *** slip and strong asymmetric deformation were observed during the first stage of lattice rotation in specimens with large *** rotation mechanism was associated with the activated slip systems according to the calculated Schmid *** impact of lattice rotation on the rupture properties was also discussed.

关键词： Nickel-base single crystal superalloy stress rupture property Orientation Dislocation

Effect of stabilizing treatment on microstructure and stress rupture properties of phosphorus microalloyed Inconel 706 alloy

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Journal of Iron and Steel Research International 2023年第8期30卷 1613-1621页

作者： Sha Zhang Yu-chao Wu Yu Lil Zhong-pei Dail Dan Jia Yan-fei Xu Guang-sheng Zeng Zhi-ming Guo Jian Liul College of Mechanical&Electrical Engineering Changsha UniversityChangsha 410022HunanChina Hunan Engineering Research Center of Research and Development of Degradable Materials and Molding Technology Changsha UniversityChangsha 410022HunanChina Changsha Kaiple Technology Co. Ltd.Changsha 410114HunanChina Institute of Metal Research Chinese Academy of SciencesShenyang 110016LiaoningChina

The microstructure and stress rupture properties of Inconel 706 alloy microalloyed with phosphorus are examined under stabilizing and unstabilizing heat treatment *** was found that applying the stabilizing treatment resulted in a 98% increment in the stress rupture life and a 215% increment in the elongation tested at 650℃/690 MPa for the alloy compared to that under the unstabilizing heat treatment *** stabilizing treatment led to the precipitation of rod-shaped and needle-shaped n phases at the grain *** of γ'-γ" co-precipitates in the grain interior were noncompact form and compact form for the alloy under unstabilizing and stabilizing heat treatment conditions,*** on the microstructure characterizations,the improvement of stress rupture properties by the stabilizing treatment was attributed to the precipitation of n phases at the grain boundaries,which can hinder cracks initiation and propagation and relieve the stress concentration.

关键词： Superalloy Stabilization ηphase γ'-γ"co-precipitate stress rupture property

Effect of Co on Microstructure and stress rupture Properties of K4750 Alloy

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Acta Metallurgica Sinica(English Letters) 2019年第12期32卷 1501-1510页

作者： Xiao-Xiao Li Mei-Qiong Ou Min Wang Xian-Chao Hao Ying-Che Ma Kui Liu Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China

The effects of substituting Co for Fe on the microstructure and stress rupture properties of K4750 alloy were *** microstructure of the alloy without Co(K4750 alloy)and the alloy containing Co(K4750-Co alloy)were *** of Co for Fe inhibited the decomposition of MC carbide and the precipitation ofηphase during long-term aging *** K4750-Co alloy,the morphology of MC carbide at the grain boundary(GB)remained dispersed blocky shape and noηphase was observed after aging at 750℃ for 3000 ***,in K4750 alloy,almost all the MC carbides at GBs broke down into granular M23C6 carbide and needle-likeη*** addition of cobalt could delay the decomposition of MC carbides,which accordingly restricted the elemental supply for the formation ofη*** stress rupture tests were conducted on two alloys at 750℃/430 *** Co is substituted for Fe in K4750 alloy,the stress rupture life increased from 164.10 to 264.67 h after standard heat *** was mainly attributed to increased concentration of Al,Ti and Nb inγ’phase in K4750-Co alloy,which further enhanced the strengthening effect ofγ’*** aging at 750℃ for 3000 h,substitution of Co for Fe can also cause the stress rupture life at 750℃/430 MPa to increase from 48.72 to 208.18 *** reason was mainly because MC carbide degradation andηphase precipitation in K4750 alloy,which promoted the initiation and propagation of micro-crack during stress rupture testing.

关键词： Nickel-based superalloy Co addition MC degradation stress rupture property

Effects of Dendritic Orientation on stress rupture Properties of DD6 Single Crystal Superalloy

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Journal of Iron and Steel Research International 2011年第10期18卷 66-71页

作者： SHI Zhen-xue LI Jia-rong LIU Shi-zhong ZHAOJin-qian National Key Laboratory of Science and Technology on Advanced High Temperature Structural Materials Beijing Institute of Aeronautical Materials Beijing 100095 China

DD6 single crystal superalloy slabs were prepared with seed method in the direetionally solidified furnace with high temperature gradient. The transverse stress rupture properties and fracture hehaviour of the alloy at 760 ℃/758 MPa, 850 ℃/550 MPa and 980 ℃/250 MPa were investigated and compared with those of longitudinal specimens. The transverse stress rupture lives are corresponding with the longitudinal stress rupture lives at 760 ℃/758 MPa and 850 ℃/550 MPa. The transverse stress rupture lives are slightly less than the longitudinal stress rupture lives at 980 ℃/ 250 MPa. The fracture mechanism of the transverse stress rupture of the alloy at 760 ℃/758 MPa shows quasi-cleav- age mode and the fracture mechanism at 980 ℃/250 MPa shows dimple mode, while the fracture mechanism at 850 ℃/ 550 MPa shows quasi-cleavage and dimple mixture mode. At higher temperature and lower stress, the microeracks are easier to initiate and interconnect in the transverse specimen than those in longitudinal specimen because there are interdendritic regions perpendicular to the axis of stress.

关键词： DD6 single crystal superalloy stress rupture property fracture behaviour

Effect of Phosphorus on stress rupture Properties of GH4133 Ni-Base Superalloy

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Journal of Materials Science & Technology 2003年第4期19卷 289-293页

作者： Wenru SUN+, Shouren GUO, Baiyun TONG, Dezhong LU, Yan XU, Xiaona MENG, Na LI and Zhuangqi HUDepartment of Superallovs, Institute of Metai Research, Chinese Academy of Sciences, Shenyang 110016, China Dept. of Superalloys Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

The effect of phosphorus on the stress rupture property of GH4133 alloy has been investigated and is compared with that of IN718 alloy. The GH4133 alloy is crept by dislocation movement. Phosphorus has a tendency to prolong the rupture life of some wrought superalloys by inhibiting the dislocation movement. If the phosphorus addition is too high, its effect on impairing the grain boundary cohesion overwhelms that on inhibiting the dislocation movement, and the life of the GH4133 alloy can be shortened. The two functions of inhibiting the dislocation movement and impairing the grain boundary cohesion determine that the optimum phosphorus content in the GH4133 alloy is around 0.011 wt pet. Phosphorus exhibits a greater effect on prolonging the rupture life of IN718 alloy than that of GH4133 alloy. The two alloys are crept by different mechanisms. The intergranular phosphorus-bearing phase is precipitated in the IN718 alloy, while not in the GH4133 alloy. The precipitation of the phosphorus bearing phase can balance the phosphorus segregation at the grain boundaries and allows a more remarkable effect of phosphorus on extending the rupture life of IN718 alloy.

关键词： Phosphorus Alloy GH4133 stress rupture property

Microstructures and properties of transient liquid phase diffusion bonded joints of Ni_3Al-base superalloy

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中国有色金属学会会刊：英文版 2001年第3期11卷 405-408页

作者：李晓红毛唯程耀永北京航空材料研究院北京 100095

An investigation of transient liquid phase (TLP) diffusion bonding of a Ni 3Al base directionally solidified superalloy, IC6 alloy, was presented. The interlayer alloy employed was Ni Mo Cr B powder alloy. The results show that the microstructure of the TLP diffusion bonded joints is a combination of γ solid solution (or a γ+γ′ structure) and borides. With the bonding time increasing, the quantity of the borides both in bonding seam and adjacent zones is gradually reduced, and the joint stress rupture property is improved. The obtained stress rupture property of the TLP bonded joints is on a level with the transverse property of IC6 base materials. [

关键词： Ni 3Al base superalloy TLP diffusion bonding stress rupture property

Effects of Long-term Aging Treatment on stress rupture Properties of FGH95 Ni-base Superalloy

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Effects of Long-term Aging Treatment on Stress Rupture Prope...