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Clarifying effect of welding co.ditions on microstructure and mechanical properties of friction stir spot-welded DH590 automotive high-strength steel plates

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Journal of Iron and steel Research International 2021年第2期28卷 232-243页

作者： Ya-peng Zhao Lian-feng Chen Shi-jie Zhu Yu-feng Sun Shao-kang Guan School of Materials Science and engineering Zhengzhou UniversityZhengzhou 450001HenanChina Henan Key Laboratory of Advanced Magnesium Alloys Zhengzhou UniversityZhengzhou 450001HenanChina Beijing Shougang co. Ltd.Beijing 100041China

Friction stir spot welding was successfully applied to the 1.2-mm-thick DH590 dual-phase steel plates by using a polycrystalline cubic boron nitride rotating *** welding,the rotation speed ranged from 600 to 1000 r/min and the penetration depth ranged from 0.1 to 0.3 *** the spot joints,the size of the stir zone increased with the increase in rotation speed as well as the penetration depth of the *** with the banded ferrite and martensite structure of the base metal,a mixed microstructure of ferrite and tempered martensite,refined bainite structure and co.rse martensite structure were found in the heat-affected zone,thermomechanically affected zone and stir zone of the joints,*** kinds of interfacial shapes were formed between the upper and lower steel plates,and the formation of the bonded interface was dominated mainly by the penetration depth of the rotating tool rather than the rotation *** was revealed that the joints with straight interfaces showed higher shear tensile loads co.paring with those with hook-like *** tensile tests showed that the maximum shear tensile load reached about 15.56 kN when the rotation speed and penetration depth were set as 800 r/min and 0.3 mm,*** specimen was fractured through plug failure mode with a total elongation of about 5.6 mm.

关键词： Friction stir spot welding DH590 dual-phase steel Microstructure Joint strength Microhardness

Morphologies of intermetallic co.pound phases in Sn-Cu and Sn-co.peritectic alloys during directional solidification

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China Foundry 2022年第5期19卷 411-418页

作者： Peng Peng Jin-mian Yue An-qiao Zhang Jia-tai Wang Jiang-lei Fan School of Physics and Electronic Information engineering Qinghai Normal UniversityXining 753000China School of Materials and Energy Lanzhou UniversityLanzhou 730000China Northwest Rare Metal Materials Research Institute Shizuishan 753099NingxiaChina Shanxi Taigang Stainless steel co. Ltd.Taiyuan 030003China School of Mechanical and Electrical engineering Zhengzhou University of Light IndustryZhengzhou 450000China

The morphologies of intermetallic phases(IMCs)during directional solidification of the Sn-Cu(L+Cu_(3)Sn→Cu_(6)Sn_(5))and Sn-co.L+co.n→co.n_(2))peritectic systems were *** primary Cu_(3)Sn and peritectic Cu_(6)Sn_(5)phases in Sn-Cu alloy are IMCs whose solubility ranges are narrow,while both the primary co.n and peritectic co.n_(2)phases in Sn-co.alloy are IMCs whose solubility ranges are nil in equilibrium *** experimental results before acid co.rosion shows that the dendritic morphology of both the Cu_(6)Sn_(5)and co.n_(2)phases can be *** investigation on the local dendritic morphology after deep acid co.rosion shows that these dendrites are co.posed of small sub-structures with faceted *** growth of the primary Cu_(3)Sn and co.n phases is also co.firmed,and a faceted to non-faceted transition in their morphologies is observed with increasing growth *** analysis shows that the dendritic morphology is formed in the solidified phases whose solubility range is larger during peritectic solidification.

关键词： intermetallic co.pound phase peritectic alloy directional solidification solubility range sub-structure

Effect of TiC addition on the microstructure and wear resistance of induction brazed nickel-based co.ting in air

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China Welding 2022年第4期31卷 1-6页

作者： Long Weimin Sun Huawei Liu Dashuang Qin Jian Zhang Lei Lu Hongbo China Academy of Machinery Ningbo Academy of Intelligent Machine Tool co. Ltd.Ningbo 315700China State Key Laboratory of Advanced Brazing Filler Metals and Technology Zhengzhou Research Institute of Mechanical Engineering Co.Ltd.Zhengzhou 450001China School of Material Science and engineering Hefei University of TechnologyHefei 230009China zhengzhou Dingsheng Advanced engineering Technology co. LtdZhengzhou 450001China

The nickel-based co.ting with different TiC addition was fabricated onto 45 steel substrate by using induction brazed technology in *** effect of TiC addition on the microstructure and wear resistance of induction brazing co.ting was *** results show that the microstructure of brazing co.ting is strengthened and refined by adding *** the increase of the amount of TiC added,the amount of TiC in the Ni-based matrix is increased,and the matrix structure is obviously *** is because the high melting point TiC particles can be used as heterogeneous nucleation co.es,thus refining the Ni based matrix ***,the wear resistance of brazing co.ting is improved due to the addition of TiC.

关键词： induction brazing nickel-based co.ting TiC

Microstructure and Mechanical Properties of Friction Stir Welded 1.5GPa Martensitic High-Strength steel Plates

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Acta Metallurgica Sinica(English Letters) 2022年第7期35卷 1079-1089页

作者： Pengcheng Zhu Lin Zhang Zhaochang Li KHLo Jianfeng Wang Yufeng Sun Shaokang Guan School of Materials Science and engineering Zhengzhou UniversityZhengzhou 450001China BAIC Group Off-Road Vehicle co.Ltd Beijing 101300China Department of Electromechanical engineering Faculty of Science and TechnologyUniversity of MacaoMacaoChina Henan Key Laboratory of Advanced Magnesium Alloys Zhengzhou 450002China

In this study, 2.4 mm thick high-strength martensitic steel plates with a tensile strength of 1500 MPa were friction stir welded at various welding speeds of 40, 60, 80, 100, 120 mm/min and a co.stant rotation speed of 300 rpm. Sound joints co.ld be obtained when the welding speed was 40, 60 and 80 mm/min, while a kissing bond was found in the joint welded at 100 and 120 mm/min. It was revealed that the peak temperature exceeded A C3(the end temperature at which all ferrite transformed to austenite when the steel was heated) for all the welding co.ditions and martensitic structures were fi nally formed in the stir zone of the joints. A signifi cant decrease in hardness was located in the heat-aff ected zone, which had a transitional microstructure from tempered martensite near base metal to a mixed structure co.taining hard martensite, soft ferrite and bainite near stir zone. For the sound joints, the specimen was fractured in the heat-aff ected zone during tensile tests and the highest tensile strength co.ld reach about 1058 MPa.

关键词： Martensitic steel Friction stir welding Heat-aff ected zone Microstructure Mechanical properties

Relation Between Sintering Reactivity of Matrix and Thermal Shock Resistance of Ultra-low Cement Bonded co.undum-spinel Castables for Fired Purging Plugs

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China's Refractories 2018年第4期27卷 13-20页

作者： ZHANG Ju LONG Bin ZHOU Yunpeng Andreas BUHR WANG Feng CUI Qingyang XIE Guofeng DING Dafei JIA Quanli YE Guotian Henan Key Laboratory of High Temperature Functional Ceramics School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China Qingdao Almatis co. Ltd.Qingdao 266510China Almatis GmbH Frankfurt 60528Germany Luoyang LIRR Refractories co. Ltd.Luoyang 471000China

Purging plugs installed in the bottom of steel ladles are widely used for the seco.dary refining of high quality steel *** dynamic service co.ditions and temperature gradients caused by the co.d inert gas blown through the plug during stirring create a strong thermal shock impact on the *** can affect its service life and restrict the safety and efficiency of steel making if the plug fails during *** this work,the influence of the particle size distribution (PSD) and amount of reactive alumina on the sintering behavior of ultra-low cement bonded co.undum-spinel based castables was investigated on lab *** relationship between sintering reactivity of matrix and thermal shock resistance of castables was evaluated in *** show that the sintering of castables can be intensified by using finer reactive ***,excessive sintering of the castable through finer reactive alumina is negative for thermal shock *** microstructure characterization reveals that castables with more intense sintering show denser matrix structure,which is less effective in hampering crack propagation and therefore results in decline of their thermal shock resistance.

关键词： reactive alumina co.undum-spinel castable sintering reactivity thermal shock resistance

TiN/γ-Fe interface orientation relationship and formation mechanism of TiN precipitates in Mn18Cr2 steel

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China Foundry 2021年第3期18卷 180-184页

作者： Zheng-hui Wang Jing-pei Xie Qian Li Wen-yan Wang Ai-qin Wang Pei Liu School of Materials Science and engineering Zhengzhou UniversityZhengzhou 450001China School of Materials Science and engineering Henan University of Science and TechnologyLuoyang 471023China National Center of International Research for Micro-nano Molding Technology Zhengzhou UniversityZhengzhou 450001China Provincial and Ministerial co.co.struction of co.laborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology Henan University of Science and TechnologyLuoyang 471023China

A Mn18Cr2 steel co.taining TiN precipitates was fabricated by vacuum induction *** morphology of TiN precipitates and the interface orientation relationship between TiN and γ-Fe were characterized by means of SEM,TEM and SAED,and the formation mechanism of TiN precipitates in Mn18Cr2 steel was *** show that the TiN precipitates are more likely to exhibit a cubic-shaped morphology and form both within the grain and at the grain boundary of γ-*** interface orientation relationship between TiN and γ-Fe is determined as follows:(100)_(TiN)//■_(γ-Fe),■_(TiN)//■_(γ-Fe).Because of the smallest interfacialmisfit,the seco.dary close-packed lane {100} of TiN preferentially co.bines with the close-packed plane {111} of γ-Fe during the precipitation in order to minimize the interface *** nucleation,the TiN precipitates exhibit cubic appearance due to the fact that the TiN has a FCC structure with rock salt type *** study provides reference for the material design of the austenitic high-manganese steels with excellent yield strength.

关键词： Mn18Cr2 steel TiN precipitates interface orientation relationship interface misfit

High valence metals engineering strategies of Fe/co.Ni-based catalysts for boosted OER electrocatalysis

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Journal of Energy Chemistry 2023年第1期76卷 195-213,I0006页

作者： Lu Li Xianjun Cao Juanjuan Huo Junpeng Qu Weihua Chen Chuntai Liu Yufei Zhao Hao Liu Guoxiu Wang Joint International Laboratory on Environmental and Energy Frontier Materials School of Environmental and Chemical EngineeringShanghai UniversityShanghai 200444China Key Laboratory of Materials Processing and Mold(zhengzhou University) Ministry of EducationZhengzhou 450002HenanChina Centre for Clean Energy Technology Faculty of ScienceUniversity of Technology SydneySydneyNSW 2007Australia

Electrocatalysis for the oxygen evolution reactions(OER)has attracted much attention due to its important role in water splitting and rechargeable metal-air ***,designing highly efficient and low-co.t catalysts for OER process is essential as the co.ventional catalysts still rely on precious *** metal-based co.pounds have been widely investigated as active OER catalysts,and renewed interest in the high valence metals engineered co.pounds has been achieved for superior catalytic activity and ***,an in-depth understanding of the co.struction strategies and induced effects for the high valence metals engineered catalysts is still lacking and *** this review,we have summarized the co.struction strategies of high valence metals as dopants or formed heterostructures with the iron/co.alt/nickel(Fe/co.Ni)-based *** the induced effects on Fe/co.Ni-based catalysts by inco.porating high valence metals,e.g.,accelerating the surface reco.struction,forming amorphous structure,generating vacancies/defects,and acting as stabilizers,are *** impacts of high valence metals on OER performance are elucidated based on different elements,including molybdenum(Mo),tungsten(W),cerium(Ce),vanadium(V),chromium(Cr),manganese(Mn),niobium(Nb),zirco.ium(Zr).The co.relations of co.struction strategies,induced effects,catalytic activity and OER reaction pathways are ***,the remaining challenges for further enhancements of OER performance induced by high valence metals are presented.

关键词： High valence metals co.struction strategies Induced effect Oxygen evolution reactions

Dome co.bustion Hot Blast Stove for Huge Blast Furnace

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Journal of Iron and steel Research International 2012年第9期19卷 1-7页

作者： ZHANG Fu-ming , MAO Qing-wu , MEI co.g-hua , LI Xin , HU Zu-rui ( Beijing Shougang International engineering Technology co.Ltd , Beijing 100043 , China ) Beijing Shougang International engineering Technology co.Ltd Beijing China

In Shougang Jingtang 5 500m 3 huge blast furnace ( BF ) design , dome co.bustion hot blast stove ( DCHBS ) technology is *** process is optimized and integrated , and reasonable hot blast stove ( HBS ) technical parameters are *** model is established and adopted by co.putational fluid dynamics ( CFD ) .The transmission theory is studied for hot blast stove co.bustion and gas flow , and distribution results of HBS velocity field , co.density field and temperature field are *** test model and hot trail unit are established , and the numeral calculation result is verified through test and investigation.3-D simulation design is *** process flow and process layout are optimized and *** air two-stage high temperature preheating technology is designed and *** sets of small size DCHBSs are adopted to preheat the co.bustion air to 520-600℃.With the preco.dition of BF gas co.bustion , the hot blast stove dome temperature can exceed 1 420 ℃. Acco.ding to DCHBS technical features , reasonable refractory structure is *** technical measures are adopted to prevent hot blast stove shell intercrystalline stress *** blast stove hot pipe and lining system are optimized and *** blowing in , the blast temperature keeps increasing , and the monthly average blast temperature reaches 1 300℃ when burning single BF gas.

关键词： dome co.bustion hot blast stove high blast temperature ceramic burner high temperature co.bustion air preheating CFD