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Casting properties of ASTM A128 Gr.E1 steel modified with Mn-alloying and titanium ladle treatment

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China Foundry 2021年第3期18卷 199-206页

作者： Uğur Gürol Erdal Karadeniz OzanÇoban Süleyman Can Kurnaz gedik welding company Ankara Caddesi34906İstanbulTurkey Sakarya University Engineering FacultyDepartment of Metallurgical&Materials EngineeringEsentepe Campus54187SakaryaTurkey Sakarya University Engineering FacultyDepartment of Mechanical EngineeringEsentepe Campus54187SakaryaTurkey Istanbul gedik University Engineering FacultyDepartment of Metallurgical&Materials Engineering34876IstanbulTurkey

This work aims to produce a high manganese steel with more refined austenite grains and better wear resistance without sacrificing the toughness and tensile properties by Mn alloying and Ti ladle treatment in comparision to ASTM A128 Gr.E1 steel (1.0C-13Mn) that is mostly used in the mining *** 1.0C-17Mn-xTi alloys (x=0,0.05 and 0.1,in wt.%) were prepared.A relationship was established between the microstructures and mechanical properties of the as-cast and solution annealed *** Ti content increases the stable Ti(CN) phase on and beside the grain boundaries and decreases up to 37% the austenite grain size of the as-cast alloy with 0.10wt.% ***,after solution annealed,optimized titanium content (0.05wt.%) results in significant improvements in wear resistance,hardness,elongation,yield and tensile strengths by 44%,31%,30%,8% and 12%,respectively,except 9% decrease in impact toughness compared to ASTM A 128 Gr.E1 steel without *** results show that 1.0C-17Mn-0.05Ti alloy can be used for parts exposed to high load wear and applied in conditions where relatively high tensile properties with sufficent ductility is needed.

关键词： high manganese steel hadfield steel ladle treatment grain refinement microstructure mechanical properties

Effects of the Reversely Rotating Assisted Shoulder on Microstructures During the Reverse Dual-rotation Friction Stir welding

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Journal of Materials Science & Technology 2015年第4期31卷 375-383页

作者： J.Q.Li H.J.Liu State Key Laboratory of Advanced welding and Joining Harbin Institute of Technology Capital Aerospace Machinery company

The reverse dual-rotation friction stir welding(RDR-FSW) has the capability to adjust the heat generation because of the separately designed tool shoulder and tool *** welding torque exerted on the workpiece by the reversely rotating shoulder is opposite to that exerted by the rotating tool pin,so the total welding torque is reduced,which is beneficial to reducing the clamping requirement of *** the present paper,a RDR-FSW joint was welded in a condition similar to the optimal welding condition of conventional FSW,and microstructures in various zones were investigated by comparison,aiming to highlight effects of the reversely rotating assisted *** to the heat conduction of the middle cylinder and the bottom end cover on which the assisted shoulder was machined,the thermal effect of RDR-FSW was smaller than that of the conventional ***,the effect of assisted shoulder on the plastic flow or deformation of material or was constrained in a thin layer near the weld top surface,and thus the flow of material especially along the thickness direction was clearly decreased in the *** the heat-affected zone(HAZ),the precipitate coarsening was the main evolution and was completed through the dissolution of small precipitates and the continuous growth of large *** contrast,the dissolution degree of precipitates increased significantly in the thermomechanically affected zone(TMAZ),and a small amount of original meta-stable precipitates transformed to block-shaped stable *** evolutions in the shoulder affected zone(SAZ)and the weld nugget zone were similar,*** majority of original meta-stable precipitates dissolved into the matrix and the remainder transformed to stable precipitates,though the dissolution degree was greater in the *** with the conventional FSW joint,the coarsening degrees of precipitates in the HAZ and TMAZ of RDR-FSW joint were much smaller,as well as the dissolution degrees of p

关键词： Friction stir welding Reverse dual-rotation fricti

Wetting behavior of AgCu-4.5Ti filler reinforced by carbon nanotubes on C/C composite

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Chinese Journal of Aeronautics 2021年第12期34卷 205-213页

作者： Xingyi LI Ling LIU Yanyu SONG Duo LIU Shengpeng HU Xiaoguo SONG Jian CAO State Key Laboratory of Advanced welding and Joining Harbin Institute of TechnologyHarbin 150001China Shandong Prorincial Key Laboratory of Special welding Technology Harbin Institute of Technology at WeihaiWeihai 264209China Hun cm Marketing company PetroChina Company LimitedChangsha 410005China

The effect of Carbon Nanotubes(CNTs)content on the wettability of AgCu-4.5Ti+x CNTs(wt%)composite filler alloys on C/C composite was *** results show that the added CNTs reacted with element Ti in the filler and produced the dispersed fine in situ synthesized TiC particles,which increased the consumption of element Ti and provided the nucleus for the growth of Ti-Cu compounds *** above effects of introducing CNTs,inhibited the formation of Ti-Cu compounds,also changed the distribution of compounds,which dramatically influenced the interfacial microstructure and characteristics of wetting *** increase of CNTs content refined and dispersed coarse Ti-Cu compounds,decreased the initial spreading temperature,and improved the wettability,but high content of CNTs(more than 0.3 wt%)decreased the wettability of the filler *** wetting interfacial microstructure of corresponding composite filler alloys were analyzed by Scanning Electron Microscope(SEM),Energy Dispersive X-ray Spectrometer(EDS)and Transmission Electron Microscope(TEM),which consisted of TiC,TiCu,TiCu;and TiCu;*** typical wetting behavior of AgCu-4.5Ti+0.3wt%CNTs composite filler on C/C composite was divided into four *** effect mechanism of CNTs content on the wetting behavior was proposed.

关键词： C/C composite Carbon Nanotubes(CNTs) Composite filler Microstructure Wetting

Reducing residual distortion of thin-plate weldments by rotating extrusion

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Journal of Central South University 2013年第4期20卷 859-865页

作者：李军杨建国方洪渊张文锋 State Key Laboratory of Advanced welding and Joining (Harbin Institute of Technology) Zhejiang Yinlun Machinery company Limited

A new method named rotating extrusion was developed to mitigate residual distortion of thin-plate weldments. The basic principle and characteristic of rotating extrusion as well as an efficient rotating extrusion device were introduced. Systematic trials were conducted to investigate the influence of several technological parameters including the distance between the extrusion tool and welding torch, the pressure acting on weldment, the dimension of the extrusion tool and its rotational speed on distortion control effect. Experimental results show that, as for 2A12T4 aluminum alloy weldment with 2 mm in thickness, 150 mm in width and 350 mm in length, when appropriate technological parameters are adopted, rotating extrusion can reduce its buckling deflection to below 3% of the original value. Implementing rotating extrusion during welding with an extrusion tool more than 100 mm away from the welding torch may achieve better distortion mitigation effect.

关键词： welding distortion thin plate aluminum alloy rotating extrusion

Characteristic of laser-MIG hybrid welding with filling additional cold wire for aluminum alloy

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China welding 2018年第3期27卷 35-41页

作者： Chang Yunfeng Lei Zhen Wang Xuyou Teng Bin Yang Haifeng Harbin welding Institute Limited company Harbin 150028China

The weld appearance, deposition rate, welding efficiency, stability of arc, laser keyhole characteristic, and weld property were studied by using a novel laser-MIG hybrid welding process with filling wire of aluminum alloy. The results were also compared with those by conventional laser-MIG hybrid welding process. It was found that with the suitable process parameters this novel welding process for aluminum alloy was stable and final weld bead had fine appearance. Compared to conventional laser-MIG hybrid welding process, during this novel welding process the stability of arc, the laser keyhole characteristic and the weld property were similar, while the keyhole cycle frequency and keyhole opening area had differences of 1.23% and 15.34%, respectively, and the welding efficiency increased by about 31% without increasing heat input.

关键词： aluminum alloy hybrid welding with filling wire deposition rate laser keyhole

Analysis of the Microstructure and Mechanical Properties during Inertia Friction welding of the Near-α TA19 Titanium Alloy

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Chinese Journal of Mechanical Engineering 2020年第6期33卷 205-217页

作者： Yanquan Wu Chunbo Zhang Jun Zhou Wu Liang Yunlei Li Research and Development Center Harbin Welding Institute Limited CompanyHarbin150028China China Academy of Machinery Science and Technology Group Co. LtdBeijing100044China

The current research of titanium alloy on friction welding process in the field of aero-engines mainly focuses on the linear friction *** to the linear friction welding,inertial friction welding of titanium alloy still has important application position in the welding of aero-engine rotating ***,up to now,few reports on inertial friction welding of titanium alloy are *** this paper,the near-alpha TA19 titanium alloy welded joint was successfully obtained by inertial friction welding(IFW)*** microstructures and mechanical properties were investigated *** showed that the refined grains within 15‒20μm and weak texture were found in the weld zone due to dynamic recrystallization caused by high temperature and plastic *** weld zone consisted of acicularα′martensite phase,αp phase and metastableβ*** lath-shapedαs andβphase in base metal were transformed into acicular martensiteα′phase and metastableβphase in thermo-mechanically affected zone and heat affected *** a result,the microhardness of welded joint gradually decreased from the weld zone to the base *** specimens in room temperature and high temperature of 480℃ were all fractured in base metal illustrating that the inertia friction welded TA19 titanium alloy joint owned higher tensile strength compared to the base metal.

关键词： Inertia friction welding TA19 Micostructure Mechanical property Texture

Analysis of local microstructure and strengthening mechanisms in adjustable-gap bobbin tool friction stir welds of Al-Mg

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International Journal of Minerals,Metallurgy and Materials 2022年第8期29卷 1589-1595页

作者： Dong Wu Wenya Li Qiang Chu Yangfan Zou Xichang Liu Yanjun Gao State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Friction Welding TechnologiesNorthwestern Polytechnical UniversityXi’an 710072China Capital Aerospace Machinery company Beijing 100076China

The bobbin tool friction stir welding process was used to join 6 mm thick 5A06 aluminum alloy *** microscope was used to characterize the *** electron backscatter diffraction(EBSD)identified the effect of non-homogeneous microstructure on the tensile *** was observed that the grain size in the top of the stir zone(SZ)is smaller than that in the centre *** lowest ratio of recrystallization and density of the geometrically-necessary dislocations(GNDs)in the SZ was found in the middle near the thermo-mechanically affected zone(TMAZ)being 22%and 1.15×10^(−13) m^(−2),*** texture strength of the heat-affected zone(HAZ)is the largest,followed by that in the SZ,with the lowest being in the *** were additional interfaces developed which contributed to the strengthening mechanism,and their effect on tensile strength was *** tensile tests identified the weakest part in the joint at the interfaces,and the specific reduction value is about 93 MPa.

关键词： friction stir welding bobbin-tool local microstructure strengthening mechanisms adjustable-gap

Non-keyhole Friction Stir welding for 6061-T6 Aluminum Alloy

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Acta Metallurgica Sinica(English Letters) 2022年第5期35卷 763-772页

作者： Peng Gong Ying-Ying Zuo Shu-De Ji De-Jun Yan Deng-Chang Li Zhen Shang College of Aerospace Engineering Shenyang Aerospace UniversityShenyang110136China Guangdong Key Laboratory of Enterprise Advanced welding Technology for Ships CSSC Huangpu Wenchong Shipbuilding Company LimitedGuangzhou510715China

A novel non-keyhole friction stir welding technique was proposed to weld the butt joint of 6061-T6 aluminum alloy with the thickness of 6 mm.A sound joint was obtained by this technique,simultaneously eliminating the flash,shoulder mark and keyhole *** sleeve directly affected zone(SDAZ)and the sleeve indirectly affected zone(SIAZ)were divided into the joint according to the plunging position of the hollow *** lack of root penetration defect was avoided when the plunging depth of the hollow sleeve was only 4.2 mm,because the hollow part inside the sleeve improved the material flow below the *** S-shaped line was left at the SIAZ,and the height of it had the minimum value of 1.47 mm at 20 mm/*** the failure location of the joint was in SIAZ/SDAZ or the heat-affected zone(HAZ)depended on the height and bonding strength of the S-shaped *** joint fracture location changed from the SIAZ/SDAZ at 35 mm/min to the HAZ at 20 and 30 mm/*** maximum tensile strength of 224.3 MPa was obtained at 30 mm/min which was 73.7%of that of the base *** fracture surface morphology exhibited the typical ductile fracture.

关键词： Non-keyhole friction stir welding welding tool simplification Microstructures Material flow Mechanical properties

Effect of welding heat input on HAZ character in ultra-fine grain steel welding

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China welding 2003年第2期12卷 122-127页

作者：张富巨许卫刚王玉涛王燕张学刚廖永平 College of Power&Mechanical Engineering Wuhan University Wuhan 430072 Wuhan Steel Group company Technique Center Wuhan430080 Harbin welding Institute Harbin150080

In this essay, we studied how heat input affected the microstructure, hardness, grain size and heat-affected zone(HAZ) dimension of WCX355 ultra-fine grain steel which was welded respectively by the ultra narrow-gap welding (UNGW) process and the overlaying process with CO 2 as protective atmosphere and laser welding process. The experimental results show when the heat input changed from 1.65 kJ/cm to 5.93 kJ/cm, the width of its HAZ ranged from 0.6 mm to 2.1 *** average grain size grew up from 2～5 μm of base metal to 20～70 μm and found no obvious soften phenomenon in overheated zone. The width of normalized zone was generally wide as 2/3 as that of the whole HAZ, and the grain size in this zone is smaller than that in base metal. Under the circumstance of equal heat input, the HAZ width of UNGW is narrower than that of the laser welding.

关键词： heat input heat-affected zone ultra-fine grain steel ultra narrow-gap welding