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Prediction of Hot Ductility of Low-Carbon Steels Based on BP Network

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Journal of University of Science and Technology Beijing 2001年第3期8卷 182-184页

作者： Xinyu Liu, Bo Wen, Xinhua Wang, Qiang Niu, Hong Chen Key Lab of New Packaging Materials & Technology of China National Packaging Corporation, Zhuzhou Engineering College, 412008, China University of Science & Technology Beijing, Beijing 100083, China Zhuzhou Engn Coll China Natl Packaging Corp Key Lab New Packaging Mat & Technol Zhuzhou 412008 Peoples R China Univ Sci & Technol Beijing Beijing 100083 Peoples R China

The purpose of the research is to obtain an effective method to predict the hot ductility of low-carbon steels, which will be a reference to evaluate the crack sensitivity of steels. Several sub-networks modeled from BP network were constructed for different temperature use, and the measured reduction of area (A(R)) of 12 kinds of low-carbon steels under the temperature of 600 to 1000 degreesC were processed as training samples. The result of software simulation shows that the model established is relatively effective for predicting the hot ductility of steels.

关键词： BP network hot ductility crack sensitivity

Study of cracking Mechanism and Wear Resistance in Laser Cladding Coating of Ni-based Alloy

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Chinese Journal of Mechanical Engineering 2021年第5期34卷 259-272页

作者： Zhenglei Yu Lunxiang Li Deqiang Zhang Guangfeng Shi Guang Yang Zezhou Xu Zhihui Zhang Key Lab of Bionic Engineering Ministry of EducationJilin UniversityChangchun 130022China State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130022China College of Mechanical and Electric Engineering Changchun University of Science and TechnologyChangchun 130022China College of Mechanical Engineering and Automation Liaoning University of TechnologyJinzhou 121001China Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process Shenyang Aerospace UniversityShenyang 110136China

Nickel-based alloy coatings were widely used for the remanufacturing of dies and moulds by laser cladding,but the crack sensitivity would be increase due to the higher strength and hardness,which reduced the wear resistance of Ni-based *** this paper,Ni-based coatings with the addition of a plastic phase(an austenitic stainless net)were prepared using laser cladding technology,and the CeO_(2)was added in cladding *** cracking mechanism,microhardness,microstructure,phase composition,and wear properties were *** relationship between thermal stress and the elastic and plastic fracture had been developed from the standpoint of fracture mechan-ics and thermal elastic fracture *** fracture criterion of the nickel-based coating was obtained,and the study has shown that the crack sensitivity could be reduced by decreasing the thermal expansion coefficientΔα.Thus,a new method was proposed,which the stainless steel nets were prefabricated on the *** was found that the number of cracks reduced significantly with the addition of stainless steel *** the stainless steel net with 14 mesh was added in Ni-based coatings,the average microhardness of nickel composite coating was 565 HV_(0.2),which was 2.6 times higher than that of the 45 steel *** the rare earth oxide 4 wt.%CeO_(2)and stainless steel net were added in the Ni-based coating reducing the microhardness(the average microhardness is 425 HV_(0.2)),the wear resistance of it improved *** wear volume of Ni-based composite coating was 0.56×10^(−5) mm^(3)·N^(−1)·m^(−1),which was 85.1%lower than that of 45 *** experiment results have shown that the Nickel-based composite coating is equipped with low crack sensitivity and high abrasive resistance with austenitic stainless net and the rare earth oxide 4 wt.%*** research offers an efficient solution to produce components with low crack susceptibility and high wear-resistance coatings fabricated

关键词： Laser cladding Wear resistance crack sensitivity Stainless steel net Rare earth oxide

Physical Simulation to Determine High TemperatureMechanical Behavior of Continuously Cast Steels

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International Journal of Minerals,Metallurgy and Materials 1997年第1期11卷 30-35页

作者： DANG Zijiu ZHANG Yan(Staute Key Lab. for Advanced Metals and Materials, USTB, Beijing, 100083, China)

Hot ductility and strength of Continuous casting(CC) steels at elevated temperatures from CC processeswere studied by physical simulation. The method is the hot ductility test. The design of test parameters and datainterpretation are discussed. The results show that the bulging of CC steel slabs which is caused by the mechanismof creep has great influence on the formation of central segregation and internal cracks. Creep tests including staticcreep tests and dynamic creep ones were performed at 1200 and 1300℃. Effects of strain rate and temperature onhot ductility are also discussed and a simple model is presented to explain the interaction between hardening and softening.

关键词： hot ductility crack sensitivity creep strain rate continuous casting

Role of elemental reduction in microstructure,microcrack,and mechanical properties of GH3230 by laser powder bed fusion

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China Foundry 2024年第6期21卷 727-736页

作者： Bo-liang Liu Jun Zhao Kai Xu Kun Shi Zhi-yi Ma Tian-yu Liu Shi-bing Liu Jian-qiang Yan State Key Laboratory of Advanced Casting Technologies Shenyang Research Institute of Foundry Co.Ltd.CAMShenyang 110022China Military Representative Office of the Air Force Equipment Department in Liaoyang Region Liaoyang 110076LiaoningChina

Two kinds of pre-alloyed GH3230 powders,each with different Si and Mn compositions,were employed to fabricate components through laser powder bed fusion(LPBF).Microstructural analysis reveals that microcrack formation in the GH3230 sample results from both microsegregation and thermal cycling-induced *** samples with different contents of Si and Mn exhibit typical epitaxial growth of columnar dendrites with directional anisotropy,indicating minimal variation in microstructure under identical thermal cycling *** occurrence of hot cracking is influenced by various factors,with chemical composition playing a crucial *** presence of these cracks significantly impacts the mechanical properties of the *** ultimate tensile strength and elongation of the GH3230-L sample,which has reduced Si and Mn content,show significant improvements compared to the GH3230 *** ultimate tensile strength increases from 735.0 MPa to 790.0 MPa,and elongation rises substantially from 11.3%to 35.2%.Thermodynamic simulations confirm that variations in Si and Mn content influence hot cracking *** Si and Mn levels narrows the solidification range,which helps to minimize the formation of hot cracks by enhancing liquid filling at grain boundaries.

关键词： laser powder bed fusion hot tearing crack sensitivity nickel base superalloy