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A comprehensive study on the oxidation behavior and failure mechanism of(γ’+β)two-phase Ni-34Al-0.1Dy coating treated by laser shock processing

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Journal of Materials Science & Technology 2023年第31期162卷 131-144页

作者： Bangyang zhou qijie zhou Jian He Wei Wang Hongbo Guo School of Materials Science and Engineering Beihang University(BUAA)Beijing 100191China Research Institute for Frontier Science Beihang University(BUAA)Beijing 100191China Key Laboratory of High-Temperature Structural Materials&Coatings Technology(Ministry of Industry and Information Technology) Beihang University(BUAA)Beijing 100191China State Key Laboratory of Long-Life High Temperature Materials Deyang 618000China Dongfang Electric Corporation Dongfang Turbine Co. LTDDeyang 618000China

Laser shock processing(LSP),as a novel surface modification technology,exhibits tremendous potential to improve the oxidation resistance of *** this paper,(γ’+β)two-phase Ni-34Al-0.1Dy coatings were prepared by electron beam physical vapor deposition(EB-PVD)and then treated by LSP with different pulse energy(4 and 5 J).Their oxidation behavior(including isothermal oxidation and cyclic oxidation)at 1150°C was *** the isothermal oxidation case,the LSP-treated samples exhibited good ox-idation resistance due to high dislocation density and refined grains caused by the *** the cyclic oxidation,however,the LSP-treated samples were subjected to undesirable thermally grown oxide(TGO)*** the early oxidation stage(within 30 min),the residual compressive stress introduced by the LSP rapidly released,resulting in a severe plastic deformation at the coating/TGO *** a result,the mismatch between coating and TGO gave rise to the TGO *** the increase in the oxida-tion time,work hardening,which continuously limited the synchronous deformation of the TGO/coating interface,became the dominant mechanism controlling the TGO spallation of 5 J-treated *** continuous TGO spallation affected the Al supply and thus deteriorated the cyclic oxidation behavior.

关键词： Ni-34Al-0.1dy coating Laser shock processing Mechanical properties Oxidation Spallation

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Effects of laser shock processing onθ-Al_(2)O_(3)toα-Al_(2)O_(3)transformation and oxide scale morphology evolution in(γ'+β)two-phase Ni-34Al-0.1Dy alloys

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Journal of Materials Science & Technology 2022年第14期109卷 157-166页

作者： Bangyang zhou Jian He qijie zhou Hongbo Guo School of Materials Science and Engineering Beihang University(BUAA)Beijing 100191China Research Institute for Frontier Science Beihang University(BUAA)Beijing 100191China Key Laboratory of High-Temperature Structural Materials&Coatings Technology(Ministry of Industry and Information Technology) Beihang University(BUAA)Beijing 100191China

(γ’+β)two-phase Ni-Al is a promising high-temperature protective coating material used on Ni-base superalloys since it has good interfacial compatibility with superalloys due to the low Al content compared to single-phaseβ-NiA *** this paper,we aim to improve the oxidation resistance,whereby Ni-34Al-0.1Dy,a(γ’+β)two-phase Ni-Al alloy,was treated by laser shock processing(LSP)and the oxidation behavior at 1150℃ was *** results showed that after oxidation,Al_(2)O_(3)scale formed on the originalβphase of the untreated alloy with a small grain size(200-800 nm),while for the LSP-treated samples,the scale grown on the originalβphase was dominantly composed of larger Al_(2)O_(3)grains with a size of 2-3μ*** distinction was attributed to the promotion ofθ-Al_(2)O_(3)toα-Al_(2)O_(3)transformation induced by the LSP,because the dislocation density,as well as surface roughness,were increased during LSP treatment which can provide heterogeneous nucleation sites forα-Al_(2)O_(3).In addition,the larger-size Al_(2)O_(3)particles,derived from the direct conversion of needle-likeθ-Al_(2)O_(3)in the initial oxidation stage,could rapidly overspread the wholeβphase surface thus reducing the scale growth rate.

关键词： Intermetallics Laser shock processing Oxidation θ-Al_(2)O_(3)toα-Al_(2)O_(3)transformation Morphology evolution

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Analysis of the Impact of the New Financial Accounting System on the Internal Audit of Colleges and Universities

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International English Education Research 2019年第3期 80-82页

作者： zhou qijie Nanjing Normal University NanjingJiangsu210023

The new financial accounting system is the reorganization and refinement of the contents of the old financial accounting system, which not only maintains the basic contents of the original system, but also has its new characteristics. As far as the applications of the new accounting system are concerned, its practicability is very strong, and especially the application of the accounting in colleges and universities is very convenient. Moreover, the levels of the financial management under the new financial and accounting system are gradually improving. The purpose of this article is to explore the impact of the new financial accounting system on the internal auditing work in colleges and universities, hoping that this research will be helpful to the related auditing work in colleges and universities in the future.

关键词： New financial accounting system universities internal audit impact analysis

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自主机器人的单元结构

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控制理论与应用 2000年第1期17卷 99-101页

作者：林怡青毛宗源周其节广东工业大学机械系广州510643 华南理工大学自动控制工程系广州510640

以离散事件动态系统的监控理论为指导 ,以运行于分布式多智能体系统框架下的运动规划系统为例研究了自主机器人的单元结构。

关键词：自主机器人单元结构智能机器人离散事件系统

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Identification of Multivariable Continuous-Time Systems From Samples of Input-Output Data

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控制理论与应用 1984年第1期 110-122页

作者： N. K. Sinha( McMaster University Hamilton,Canada )zhou qijie( South China Institute of Technology, Guangzhou )

Several methods for the identification of linear multivariable continuous - time systems from the samples of input-output data are discussed. These include three new methods proposed by the authors. The suitability of these methods for estimating the parameters of the system using a recursive least - squares algorithm is compared using a simulated example. The results indicate that the best results are obtained using the block pulse function method as proposed by the authors.

关键词： time Identification of Multivariable Continuous-Time Systems From Samples of Input-Output Data

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Research On Fault Tolerant Control Strategy of Multi-Degree-of-Freedom Manipulator with Single Joint Faults

Research On Fault Tolerant Control Strategy of Multi-Degree-...

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第37届中国控制会议

作者： qijie zhou Manlu Liu Wei Wang Liang Xu Tianxiang Ao Hua Zhang Special Environment Robot Technology Key Laboratory of Sichuan Province Southwest University of Science and Technology Datang Shandong Yantai Power Development co.LTD

While performing the typical task of point-to-point motion of redundant manipulator,single joint faults suddenly *** the effect of the configuration on the manipulator’s task,here we propose an improved genetic algorithm based on the measurement of manipulator end-to-target position error and the manipulability measure,which makes the end of the manipulator arrive at the target position with less error *** addition,it also makes the machine has a greater operable arm configuration upon *** is used for modeling and simulating with a three-link planar arm as an *** groups of simulation experiments are carried out to compare the improved genetic algorithm with the traditional genetic algorithm based on position error,and the simulation results are analyzed and ***,the physical robot proves the validity and reliability of this method.

关键词： Redundant Manipulator Manipulability Measure Position Error Genetic Algorithm

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Manipulator Control Method Based on Deep Reinforcement Learning

Manipulator Control Method Based on Deep Reinforcement Learn...

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第32届中国控制与决策会议

作者： Rui Zeng Manlu Liu Junjun Zhang Xinmao Li qijie zhou Yuanchen Jiang Special Environment Robot Technology Key Laboratory of Sichuan Province Southwest University of Science and Technology

Robotic arm have transformed the manufacturing industry and have been used for scientific exploration in human inaccessible environments. The existing manipulator control methods based on deep reinforcement learning usually discretize the action space or consider the planar manipulator, which results in great limitations of the tasks that the manipulator can accomplish complete. In this paper, we propose a control method based on the Deep Deterministic Policy Gradient（DDPG） algorithm for the 6 degree-of-freedom manipulator that reach the object position in three-dimensional space. This paper designs two types of reward functions, and introduces the manipulability index into the algorithm. The manipulability index evaluates the flexibility of the robotic arm in the work space, which is referenced by the algorithm to optimize the joint pose of the robotic arm to reach the object position. By building a simulation platform to compare the algorithms based on two reward functions, the effectiveness of the DDPG algorithm is verified, and the 6 degree-of-freedom manipulator can reach the object position with more flexible posture based on the DDPG algorithm with manipulability index.

关键词： Deep reinforcement learning Manipulator Reward function Joint pose

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