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Journal of Materials Science & Technology 2023年第5期136卷 121-139页

作者： Zhongze Yang wenchen xu Weiqing Zhang Yu Chen Debin Shan National Key Laboratory for Precision Hot Processing of Metals&School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

The microstructural evolution and mechanical properties of low-cost Ti-5.5Al-1Fe-3.5Cr-3.2Zr-0.2Si al-loy during power spinning and after three types of heat-treatment routines(low-temperature anneal-ing,high-temperature annealing,solution and annealing)were systematically *** effective heat-treatment routine to fabricate high-strength and acceptable ductile as-spun Ti-5.5Al-1Fe-3.5Cr-3.2Zr-0.2Si alloy tubes was then proposed whereby the relationship between the mechanical performances and mi-crostructures was ***{0002}_(α)and{001}_(β)textures were formed after multi-pass power *** as-spun LC-Ti alloy exhibited a good combination of strength and elongation after heat treat-ment at 550℃for 4 h,which was ascribed to the large plastic induced low-temperature spheroidization of deformedαphase and nanoscaleαprecipitation from deformedβ***,the elongation de-creased evidently when Zr2Si/TiCr2 participated at the interphase boundaries after heat treatment at 550℃for 8 *** high-temperature annealing,the elongation changed nonlinearly owing to the precipitation of Zr2Si particles at triangular grain boundaries treated at 750℃for 1 h,and the spheroidization of the deformedα_(p)*** solution and annealing conditions,lenticularαs would participate from the metastableβgrains,which contributed to the greatest strength albeit poor *** study provides an effective guidance for the processing and application of the low-cost titanium alloy.

关键词： Low-cost titanium alloy Power spinning Heat treatment Microstructure evolution Mechanical property

Analysis of abnormal texture formation and strengthening mechanism in an extruded Mg-Gd-Y-Zn-Zr alloy

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Journal of Materials Science & Technology 2020年第10期42卷 133-145页

作者： xueze Jin wenchen xu Zhongze Yang Can Yuan Debin Shan BugangTeng Bo Cheng Jin National Key Laboratory for Precision Hot Processing of Metals&School of Materials Science and Engineering Harbin Institute of TechnologyHarbin150001China Advanced Composites Simulation Lab University of Southern CaliforniaLos AngelesCA 90089-0241USA

A Mg-Gd-Y-Zn-Zr magnesium alloy with different initial states was extruded under different extrusion *** effect of solution treatment and extrusion parameters on the microstructure,texture and mechanical properties were analyzed in detail,and the abnormal texture formation and strengthening mechanism was *** extruded at low temperature and small extrusion ratio,the bimodal microstructure consisting of fine dynamically recrystallized grains and coarse deformed grains occurred both in the as-cast alloy and solution-treated *** the extrusion temperature and extrusion ratio were increased,the amount and size of dynamically recrystallized grains increased and the grain size of the solution-treated alloy showed higher growth ***,an abnormal texture withparallel with extrusion direction developed due to the occurrence of non-basal slip and continuous dynamic *** could be enhanced by solution treatment,high temperature,and large extrusion *** the as-cast alloy and solution-treated alloy exhibited the highest tensile strength after extrusion at 300℃with an extrusion ratio of *** refinement was the main strengthening mechanism utilized in both the as-cast alloy and the solution-treated *** hardening played an important role in the sample extruded at low temperature and small extrusion ratio,with the highest contribution of about 33 MPa after extrusion at 300℃with an extrusion ratio of *** strengthening contributed more in the sample extruded at high temperature and large extrusion ratio,but no more than 24.1 *** strengthening was another strengthening mechanism in the extruded as-cast alloy,especially at high temperature and large extrusion ratio(no more than 9 MPa).

关键词： Hot extrusion Heat treatment Abnormal texture Strengthening mechanism Quantitative analysis

Combination of eddy current and heat treatment for crack healing and mechanical-property improvement in magnesium alloy tube

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Journal of Magnesium and Alloys 2021年第5期9卷 1788-1801页

作者： wenchen xu Chuan Yang Haiping Yu xueze Jin Guojing Yang Debin Shan Bin Guo School of Materials Science and Engineering&National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China Institute of Machinery Manufacturing Technology China Academy of Engineering PhysicsMianyangSichuan621900China

The continuous eddy current pulse treatment(ECPT)combined with heat treatment was employed to heal the microcracks in spin formed Mg alloy tubes and improve their mechanical properties in this *** results show that all the microcracks in different tube specimens were almost healed after different continuous ECPT schemes up to 15 *** schemes with less cooling intervals exhibited better healing effect and increased the strength and elongation of Mg alloy tubes more *** aging treatment,the strength improvement of the specimens with ECPT was more remarkable than that of the specimens without ECPT,and the elongation decrease of the specimens with ECPT was less evident than that of specimens without ECPT due to the segregation of RE elements on the crack ***,after solution treatment,the strength reduction and ductility improvement of the specimens with ECPT were more pronounced than that of the specimens without ECPT owing to the notable decrease of dislocation density of the specimens with *** narrowed cracks induced by ECPT and the segregation of precipitates in the vicinity of microcrack surface during aging treatment contributed to the maximum strength in the as-spun specimens with ECPT followed by aging treatment.

关键词： Microcrack Healing Eddy current pulse treatment Heat treatment

Process design and microstructure-property evolution during shear spinning of Ti_(2)AlNb-based alloy

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Journal of Materials Science & Technology 2022年第6期101卷 1-17页

作者： Sibing Wang wenchen xu Bin Shao Guoping Yang Yingying Zong Wanting Sun Zhongze Yang Debin Shan School of Materials Science and Engineering&National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China Capital Aerospace Machinery Co.Ltd. Beijing 100076China

Rotationally symmetric workpieces of Ti_(2)AlNb-based alloys have great potential for high-temperature service condition in aviation industry,while the poor workability limits their application until *** this study,shear spinning and heat treatment were first conducted to investigate the corresponding microstructure evolution and mechanical properties of Ti_(2)AlNb conical *** microstructure of the 1^(st) and 2^(nd) pass spun workpieces(SP1 and SP2)mainly consisted of B2+retainedα*** two passes spinning,the B2 phase texture changed from//ND of as-received alloy to be//*** ultimate tensile stress(UTS)of SP1 and SP2 was increased to 1163 MPa and 932 MPa,respectively,compared with 782 MPa of as-received alloy at 650℃.Also,the yield stress anomaly(YSA)occurred in SP1 and SP2 because{110}and{112}cross slip systems of B2 phase were difficult to slip at or below room temperature(RT),but they became active at 650℃ and *** an essential step for increasing the spinnability of multi-pass spinning process of the Ti_(2)AlNb alloy,the H3heat treatment scheme,i.e.960℃/2 h+850℃/12 h,was carried out between two successive passes to increase the hot workability,by which the ductility of the heat treated as-spun workpieces with the microstructure of B2+primary O+acicular secondary O+high amount spheroidizedα2phases reached 72.1%at 900℃.After being subject to the H1 heat treatment scheme,i.e.960℃-2 h,the spun workpieces with the microstructure of B2+primary O+intergranular primaryα2phases achieved an optimized comprehensive mechanical properties both at room temperature and 650℃,which should be chosen as the post-spinning heat treatment process for the service requirement.

关键词： Ti_(2)AlNb-based alloy Shear spinning Conical workpiece Microstructural evolution Mechanical property

Research on the Characteristics of Hot Deformation in BT20 Titanium alloy and Its Optimum Spinning Temperature Range

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Journal of Materials Science & Technology 2005年第6期21卷 807-812页

作者： wenchen xu+, Debin SHAN, Yan LU and Chunfeng LISchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China School of Materials Science and Engineering Harbin Institute of Technology

Hot compression tests were conducted on a Gleeble-1500 simulator to investigate the hot deformation behavior of BT20 Ti alloy （Ti-6Al-2Zr-IMo-1V） in the temperature range from 550 to 1000℃ at constant strain rate in the range of 0.01-1s^-1, and then the optimum spinning temperature range was determined. Moreover, tube spinning experiments were executed to verify the reasonability of the optimum temperature range. The results show that the flow stress declines gradually with increasing deformation temperature and decreasing strain rate. In α＋β phase region the dynamic recrystallization is the main softening mechanism and in β phase region the hot deformation softening is controlled by dynamic recovery. In α＋β phase region with reducing strain rate dynamic recrystallization is fully developed. The optimum temperature of hot spinning is 850-900℃ and that of warm spinning is 600-650℃. Meanwhile, at the temperature above 600℃ tubular workpieces of BT20 Ti alloy have been spun without surface cracks and microstructure inhomogeneity, which proves that the optimum spinning temperature range obtained through hot compression experiments is reasonable.

关键词： Dynamic recrystallization Dynamic recovery Phase transformation Optimumtemperature Tubular spinning BT20 titanium alloy

Hot spinning of cylindrical workpieces of TA15 titanium alloy

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Rare Metals 2007年第S1期26卷 255-261页

作者： xu wenchen,SHAN Debin,YANG Guoping,CHEN Yu,LU Yan,and KANG Dachang School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China Harbin Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R China

In order to form large-diameter thin-wall cylindrical workpieces of TA15 titanium alloy,tube hot spinning experiments of the alloy were conducted on a CNC hot spinning *** causes of some forming defects occuring in hot spinning,such as crack,pileup,bulge and corrugation,were analyzed and the corresponding measures were put forward to avoid spinning defects,based on which a proper process scheme of hot spinning of TA15 alloy was obtained and the large-diameter and thin-walled cylindrical workpieces were formed with good *** results show that spinning temperature has distinct influence on forming quality of spun *** range of spinning temperature determines the spinnability of titanium alloy and the ununiformity of temperature distribution near the deformation zone leads to the formation of *** reasonable heating method is that the deforming region is heated to the optimum temperature range of 600-700 ℃,the deformed region is heated continuously and a certain length of undeformed region is *** the thickness-to-diameter ratio(t/D) of spun workpiece reducing to certain value(t/D<1%),surface bulge and corrugation is rather easier to come into being,which could be controlled through restraining diameter growth and employing smaller reduction rate and lower temperature in the optimum spinning temperature range.

关键词： TA15 titanium alloy hot spinning cylindrical workpiece forming defect thickness-to-diameter ratio

Ti43Al5Nb0.03Y合金高温热压缩行为及其组织演变

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稀有金属材料与工程 2009年第8期38卷 1368-1372页

作者：张浩徐文臣单德彬哈尔滨工业大学黑龙江哈尔滨150001

在热模拟试验机上对Ti43Al5Nb0．03Y合金进行压缩变形实验，温度范围为1050～1200℃，应变速率范围为10^-3-10^-1s^-1，获得了其真应力-真应变曲线，并对热变形组织进行显微分析。结果表明：在低于1200℃的条件下，材料的锻后组织为残... 详细信息

在热模拟试验机上对Ti43Al5Nb0．03Y合金进行压缩变形实验，温度范围为1050～1200℃，应变速率范围为10^-3-10^-1s^-1，获得了其真应力-真应变曲线，并对热变形组织进行显微分析。结果表明：在低于1200℃的条件下，材料的锻后组织为残余层片和再结晶晶粒的混合组织，而温度达到1200℃时，材料锻后得到完全再结晶组织；在实验所涉及的温度及应变速率范围内，Ti43Al5Nb0．03Y合金的塑性变形机制主要为γ相中的滑移和孪生，其流变软化机制主要为γ相动态再结晶以及少量的γ相中的回复；该合金锻造温度不宜低于1200℃，在锻造工艺参数为1200℃，10^-3s^-1条件下可以得到表面无裂纹，变形组织为细小等轴晶组织的锻件。

关键词： TiAl合金热模拟显微组织流变应力

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TC11钛合金热变形机制及其热加工图

稀有金属材料与工程 2009年第4期38卷 632-636页

作者：单德彬史科徐文臣吕炎哈尔滨工业大学黑龙江哈尔滨150001

研究了TC11钛合金在温度800～1050℃，应变速率0．005～5S^-1条件下的高温压缩变形行为，基于动态材料模型建立了热加工图，并结合变形微观组织观察确定了该合金在实验条件下的高温变形机制。结果表明：TC11钛合金在两相区低应变速率下... 详细信息

研究了TC11钛合金在温度800～1050℃，应变速率0．005～5S^-1条件下的高温压缩变形行为，基于动态材料模型建立了热加工图，并结合变形微观组织观察确定了该合金在实验条件下的高温变形机制。结果表明：TC11钛合金在两相区低应变速率下（0．005～0．05S^-1）变形时主要发生片状组织的球化，并且球化的效果随变形温度的降低和应变速率的增加而增加。在两相区高应变速率下（0．05～5s^-1）变形时发生热加工的非稳定流动，产生剪切裂纹和剪切带等缺陷。在卢相区低应变速率下（0．005～0．05S^-1）变形时发生动态再结晶，高应变速率下（0．05～5S^-1）发生动态回复，并且应变速率大于0．1s^-1时有可能发生不稳定流动现象。在变形温度为900℃左右、应变速率为0．005s^-1时，功率耗散率达到峰值，约为57％。

关键词： TC11钛合金变形机制加工图流变失稳

TA15钛合金筒-锥复合曲母线构件旋压成形工艺研究

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材料科学与工艺 2016年第4期24卷 10-17页

作者：赵小凯徐文臣陈宇林恒龙张治朋单德彬金属精密热加工国家级重点实验室(哈尔滨工业大学) 哈尔滨工业大学材料科学与工程学院扬州华宇管件有限公司

TA15钛合金作为一种高比强度结构材料具有良好的室温和高温强度、热稳定性能,广泛应用于飞机、导弹和发动机等飞行器,实现关键受力构件的减重要求.本文针对钛合金筒-锥复合曲母线构件的特点,重点开展了TA15钛合金薄壁曲母线构件热旋压... 详细信息

TA15钛合金作为一种高比强度结构材料具有良好的室温和高温强度、热稳定性能,广泛应用于飞机、导弹和发动机等飞行器,实现关键受力构件的减重要求.本文针对钛合金筒-锥复合曲母线构件的特点,重点开展了TA15钛合金薄壁曲母线构件热旋压成形技术的研究,采用剪切旋压预成形,强力旋压/普通旋压多道次复合旋压终成形的工艺方案,获得了成形质量较好的TA15钛合金筒-锥复合曲母线旋压件.建立了多道次曲母线构件的有限元模型,结合旋压实验解释了强旋/普旋复合成形过程中出现的典型缺陷产生机制.对热旋压过程坯料的显微组织观察分析发现,剪切旋压对显微组织具有一定程度的晶粒破碎作用,多道次强旋/普旋复合旋压成形后显微组织沿构件轴向和切向都发生伸长.经历剪切旋压和多道次强旋普旋复合旋压成形后,坯料的微观组织更加细化,且均匀性得到改善.TA15钛合金旋压成形工件的单向拉伸实验结果表明,相对于原始坯料旋压件强度明显提高,塑性略有下降.

关键词： TA15钛合金曲母线构件强力旋压复合旋压多道次成形有限元模拟

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航空航天复杂构件的精密塑性体积成形技术

锻压技术 2021年第9期46卷 1-15页

作者：宗影影王琪伟袁林徐文臣单德彬哈尔滨工业大学金属精密热加工国家级重点实验室黑龙江哈尔滨150001

综述了航空航天复杂构件的等温锻造、局部加载和多向模锻3种精密塑性体积成形技术。对等温锻造技术,重点介绍了其应用范围与3个主要的研究方向(坯料设计、工艺参数设计与模具结构设计);对局部加载技术,着重论述了其变形特点以及不连续... 详细信息

综述了航空航天复杂构件的等温锻造、局部加载和多向模锻3种精密塑性体积成形技术。对等温锻造技术,重点介绍了其应用范围与3个主要的研究方向(坯料设计、工艺参数设计与模具结构设计);对局部加载技术,着重论述了其变形特点以及不连续局部加载的3种实施方式(简单冲头式、垫板式和分模式),并结合实例介绍了连续局部加载的3种成形方法(内壁带筋的薄壁圆环径向包络成形、涡轮盘辊轧成形和网格筋板构件辊轧成形);对多向模锻技术,简要阐述了典型三通件多向模锻成形的研究现状,以及多向模锻技术的应用情况。最后,对这些技术未来朝着尺寸更大、形状更复杂、更难变形材料、更高成形精度以及更多领域的方向发展进行了展望。

关键词：航空航天复杂构件精密塑性体积成形等温锻造局部加载多向模锻