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The co.parison of multi-layer narrow-gap laser and arc welding of S32101 duplex stainless steel

China Welding 2022年第4期31卷 37-47页

作者：李军兆温凯孙清洁刘一搏孔玢曾宪山 hunan xiangtou goldsky New Materials co. LTDYiyang 413000China Shandong Provincial Key Laboratory of Special Welding Technology Harbin Institute of Technology at WeihaiWeihai 264209China hunan xiangtou goldsky titanium metal co. LTD.Changsha 410205China

Multi-layer narrow-gap welding of thick S32101 duplex stainless steel was co.ducted using laser welding with beam wobble process.The phase transition,grain size,phase proportion and crystal texture of welded joint were also studied and co.pared with gas metal arc welding process.The microhardness and tensile strength were measured and fracture surface was analyzed to evaluate the mechanical properties of welded joints.The results showed that beam wobble technology improved the misalignment of laser beam and filler wire in narrow groove and helped to avoid inco.plete fusion defects.co.pared to arc welding process,the groove size and heat input were reduced,while welding efficiency was increased.The faster co.ling rate and lower temperature gradient of laser wobble welding favored grain refinement,while the austenite co.tent in weld zone decreased.Both the beam wobble and swing arc were co.ducive to stir weld pool,optimizing the weld microstructure and joint formation.The microstructural variance in various weld passes was caused by the heat input and heat dissipation ability.The microhardness of laser welded joint was lower,while the tensile strength and elongation percentage were higher.The fracture surface of arc welded joint was featured with shallower dimples and cleavage steps.

关键词： narrow gap welding laser welding gas metal arc welding duplex stainless steel mechanical properties

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Effects of heat treatment on mechanical properties of an extruded Mg-4.3Gd-3.2Y-1.2Zn-0.5Zr alloy and establishment of its Hall–Petch relation

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Journal of Magnesium and Alloys 2022年第2期10卷 539-551页

作者： Lei Liu Xiaojie Zhou Shilun Yu Jian Zhang Xianzheng Lu Xin Shu Zaijun Su hunan Provincial Key Laboratory of Intelligent Manufacturing Technology for High-performance Mechanical Equipment Changsha University of Science and TechnologyChangsha 410114China hunan xiangtou goldsky titanium metal co. Ltd.Changsha 410205China hunan Aerospace Tianlu Advanced Material Testing co. LtdChangsha 410600China School of Mechanical Engineering Hunan University of TechnologyZhuzhou 412007China

The effects of T4,T5,and T6 treatment on the microstructure and mechanical properties of the extruded Mg-4.3Gd-3.2Y-1.2Zn-0.5Zr(wt.%)alloy with a relatively low RE co.tent(7.5 wt.%)were investigated.T4 treatment at 450–500°C induces a gradual grain growth ofα-Mg but an obvious transition of texture co.ponent from⊥ED to∥ED.Interdendritic LPSO phases are highly stable against annealing while intragranular ones experience dissolution and re-precipitation.After peak-ageing at 200°C,the elongation of as-extruded and T4 samples is just slightly reduced or even increased due to the weak ageing hardening response.T5 sample exhibits an attractive co.bination of strength and ductility,with a tensile yield strength(TYS)of 303 MPa and elongation of 20.0%.The Hall–Petch relation for the alloys with or without ageing treatment has been estimated.Grain boundary strengthening rather than precipitation strengthening has the dominant co.tribution to TYS,and a modified equation is developed to predict grain boundary strengthening values for Mg-Gd-Y-Zn-Zr alloys which co.tain different Schmid factors for basal slip.

关键词： Magnesium alloys Heat treatment Hall–Petch Mechanical properties Strengthening mechanism

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Characterization ofα_(2)Precipitates in Ti–6Al and Ti–8Al Binary Alloys:A co.parative Investigation

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Acta metallurgica Sinica(English Letters) 2021年第5期34卷 710-718页

作者： Sabry S.Youssef Xiaodong Zheng Yingjie Ma Sensen Huang Min Qi Jianke Qiu Ruixue Zhang Peitao Hua Shijian Zheng Jiafeng Lei Rui Yang School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China Institute of metal Research Chinese Academy of SciencesShenyang110016China Innovation Group of Marine Engineering Materials and co.rosion co.trol Southern Marine Science and Engineering Guangdong LaboratoryZhuhai519080China School of Materials Science and Engineering Northeastern UniversityShenyang110819China hunan goldsky titanium Industry Technology co. LtdChangde415001China School of Materials Science and Engineering Research Institute for Energy Equipment MaterialsHebei University of TechnologyTianjin300130China

Transmission electron microsco.y(TEM)and atom probe tomography(APT)techniques were used to investigate the nanoscale orderedα_(2)(Ti_(3)Al)precipitates in Ti–Al binary alloys.Ti–6Al and Ti–8Al binary alloys were solution treated and aged to obtain Widmanstatten microstructure and promoteα_(2)precipitates.The TEM results displayed strong short-range ordering ofα_(2)precipitates in Ti–8Al alloy,while no evidence of the superlattice reflections ofα_(2)in Ti–6Al alloy.The results acquired from APT showed theα_(2)clusters and atoms distribution at the interface between the matrix andα_(2)precipitates.The size and morphology ofα_(2)particles in Ti–8Al alloy,respectively,obtained by TEM and APT are closely co.sistent.Meanwhile,the APT results displayed tiny size clusters in Ti–6Al alloy,which supposed to give evidence of the initial ordering process ofα_(2)precipitates in the absence of co.relative results from TEM.

关键词： Ti–Al binary alloys Ti_3Al precipitates Transmission electron microsco.y Atom probe tomography

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