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Investigation into the stress-strain compatibility and fracture behaviour of a TC18 titanium alloy with a multistage lamellar microstructure

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Progress in Natural Science:Materials International 2024年第5期34卷 1039-1048页

作者： Zhongxiang Li Zhaoxin Du Jun Cheng Zhiyong Yue tianhao gong Xudong Kang Yongcheng Zhu School of Materials Science and Engineering Inner Mongolia University of Technology Collaborative Innovation Center of Non-ferrous Metal Materials and Processing Technology Co-constructed By the Province and Ministry Inner Mongolia Autonomous Region Inner Mongolia University of Technology Northwest Institute for Nonferrous Metal Research Shanxi Key Laboratory of Biomedical Metal Materials School of Mechanical Engineering Inner Mongolia University of Technology

Understanding the fracture mechanism is essential for optimizing the mechanical properties of titanium *** relationship between fracture behaviour and the multistage lamellar microstructure of the TC18(Ti–5Al–5Mo–5V–1Cr–1Fe) alloy was investigated via in situ tensile and three-point bending tests. The results indicate that the TC18 alloy, featuring a multistage lamellar microstructure(including a β matrix, primary lamellar α phase, bundles, and secondary lamellar α phase), exhibits an excellent combination of strength and ductility. The precipitation of the secondary lamellar α phase significantly enhances the alloy's strength but weakens the stress-strain compatibility of the microstructure. This results in a smaller crack-tip plastic zone(CTPZ) and causes dislocations to concentrate more at the grain boundaries and, to a lesser extent, at the phase interfaces. Consequently, in the later stages of crack propagation, microvoids and microcracks tend to form at dislocation pile-ups. With increasing stress, these microvoids and microcracks rapidly coalesce, leading to a greater proportion of intergranular fracture and thus reducing the fracture toughness of the alloy.

关键词： Crack-tip plastic zone (CTPZ) Fracture behaviour In situ stretching Stress‒strain compatibility TC18titanium alloys

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Grain refinement and phase precipitation simultaneously improve the strength and ductility of ultra-high strength titanium alloy sheets

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Progress in Natural Science:Materials International 2024年第5期34卷 1066-1075页

作者： Xudong Kang Zhaoxin Du Shaojun Wang Jun Cheng Zhiyong Yue tianhao gong Jingshun Liu Shuzhi Zhang School of Materials Science and Engineering Inner Mongolia University of Technology Collaborative Innovation Center of Non-ferrous Metal Materials and Processing Technology Co-constructed by the Provience and Ministry Inner Mongolia Autonomous Region Inner Mongolia University of Technology Northwest Institute for Non-Ferrous Metal Research Shanxi Key Laboratory of Biomedical Metal Materials College of Mechanical Engineering Inner Mongolia University of Technology State Key Laboratory of Metastable Materials Science and Technology Yanshan University

The simultaneous high strength and high plasticity of metastable-β titanium alloy sheets remains a difficult challenge. In this work, a 1.2 mm thick sheet of Ti–15Mo–3Al-2.7Nb-0.25Si titanium alloy was obtained after rolling and annealing, and then subjected to a duplex-ageing treatment. The pre-ageing temperatures fell in the range of 300–390°C for 0.5–2h. The re-ageing temperatures were in the range of 500–600°C. After characterization, it was found that the alloy precipitates ω-phases during the pre-ageing process, and the distribution of such ω-phases evolves unevenly and increases in number with the increase of the pre-ageing ***, the strengthening mechanism of the alloy sheet is mainly α-phase nucleation assisted by ω-***, grain refinement appears as a mechanism to ensure the plasticity of the alloy. Finally the ω-phase evolution law is discussed in detail and the strengthening mechanism of the alloy sheet is also analyzed. At this work, a metastable-β titanium alloy sheet with strength of 1445.75 MPa and elongation of 6.55 % was *** study provides a new idea for the microstructure design and process improvement of the metastable-β titanium alloy sheet.

关键词： Duplex-ageing treatment Metastable-β titanium Strengthening mechanism ω-phase

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Microstructure evolution and corresponding tensile properties of Ti–5Al–5Mo–5V–1Cr–1Fe alloy controlling by multi-heat treatments

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Progress in Natural Science:Materials International 2021年第5期31卷 731-741页

作者： Zedong Liu Zhaoxin Du Hanyu Jiang tianhao gong Xiaoming Cui Jingwen Liu Jun Cheng School of Materials Science and Engineering Inner Mongolia University of Technology Inner Mongolia Key Laboratory of Light Metal Materials Inner Mongolia University of Technology Northwest Institute for Non-ferrous Metal Research Shaanxi Key Laboratory of Biomedical Metal Materials

The effects of microstructure morphology on corresponding tensile mechanical properties of Ti–5Al–5Mo–5V–1Cr–1Fe alloy controlling by three different heat treatment conditions (solution,single-step and two-step aging) were investigated in the present *** results show that the solution temperature exhibited an important impact on the precipitation behavior of secondary-αphase (αs) during aging,in which the content ofαsgradually increased with the increase of solution *** the alloy was single-step aged at500–600~°C,the needle-likeαsprecipitated from matrix,as well as the content ofαsdecreased and coarsened corresponding to the increase of aging *** with single-step aging,theαsslightly increased when the alloy was subjected to two-step aging heat *** tensile results show that theαsis the main strengthening phase in the ***,its content as well as the intensity of the precipitation mode directly affects the strength,whereas inevitably with an accompanying penalty on *** general,the higher solution temperature and the lower first-step aging temperature result in a more intensiveαsand then lead to the higher ***,{10■2}and{10■1}twins were found in two-step aged tensile samples,which may impart twinning-induced plasticity (TWIP).Overall,this study demonstrates that the alloy can be heat treated to achieve an excellent match between strength and ductility and to provide sufficient stress and optional ductility(ultimate strength of 978–1439 MPa and elongation of 8.25–18.9%).

关键词： Titanium alloy Heat treatment Two-step aging Microstructures Tensile properties Twins

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Effect of cold rolling process on microstructure and mechanical properties of high strength β titanium alloy thin sheets

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Progress in Natural Science:Materials International 2018年第6期28卷 711-717页

作者： Yan Ma Zhaoxin Du Xiaoming Cui Jun Cheng Guolong Liu tianhao gong Huimin Liu Xiaopeng Wang Yuyong Chen School of Materials Science and Engineering Inner Mongolia University of Technology Northwest Institute for Nonferrous Metal Research National Key Laboratory for Precision Hot Forming of Metals Harbin Institute of Technology

The microstructure and mechanical properties of Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe high strength titanium alloy sheets prepared by unidirectional cold rolling and two-step cross cold rolling were investigated. Results showed that the β phase grains were refined significantly by cold rolling followed by solution treatment for a short *** to unidirectional cold rolling, the short time solution treatment after two-step cross rolling could significantly reduce the non-uniformity of the microstructure of the alloy sheets. After aging treatment at 550 ℃,the anisotropy of the mechanical properties still existed in the unidirectional rolled sheets, and the tensile strength was highest along the rolling direction. After solution and aging treatment, the anisotropy of the mechanical properties of the two-step cross rolling process sheet was not obvious than unidirectional cold rolling,and alloy had good strength and plasticity matching.

关键词： Cold rolling process High strength β titanium alloy Microstructure Mechanical properties

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Large Gravity Flow Deposits in the Member 1 of Paleogene Shahejie Formation, Qikou Sag, Bohai Bay Basin

Large Gravity Flow Deposits in the Member 1 of Paleogene Sha...

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第十五届全国古地理学及沉积学学术会议

作者： Si Chen Hua Wang Chuanyan Huang tianhao gong Key Laboratory of Tectonics and Petroleum Resources MOEChina University of Geosciences

The large scale gravity flow deposits（up to 1700 km2） that developed in the Member 1 of Shahejie Formation（Paleogene） in the Binhai slope area in the Qikou Sag shows the sedimentary characters of multiple sediment sources, long distance and multi-fault transport, and preservation along the transfer path during the sedimentary processes. This study focus on the gravity flow deposits in the oil-rich Qikou Sag in Bohai Bay Basin. Under the sequence stratigraphy framework, the source-transport path-sink processes has been discussed. The aim of this study is to（1） illuminate the formation of the multiple sources, the configuration relationship between different sources, and the origin of continuous sediment supply.（2） analyze the controlling and evolution of the paleogeomorphology（fault-controlling steep slope and multi-step fault slope）, sediment transport, the sedimentary develop mechanism in processes.（3） focus on the distributions, sedimentary patterns and space evolution of the large scale multi-stages gravity flow deposits.（4） discuss the formation mechanism and controlling factors of the gravity flow in Qikou Sag. The conclusions include:（1） the gravity flow was controlled by multiple sources. During the Member 1 of Shahejie Formation, the Binhai slope was supplied by sources from four different areas that include: Dashentang source from northern Yanshan Mountain, Chadian sources, Gegu and Xiaozhan sources from western Cangxian Uplift. The continuous sediment supply allows the large scale gravity flow to be formed in the lacustrine basin.（2） the paleogeomorphology of the Member 1 of Shahejie Formation in the Qikou Sag is the complex of fault-controlling steep slope and multi-step fault slope. The fault-controlling steep slope is developed in the northern part of Binhai Slope, as the multi-step fault slope is mainly developed in the orientation of west to east in the west part of Binhai Slope. The fault zones play a role as the transport paths for the sediments and

关键词： Qikou Sag Gravity flow deposits multiple overlap layers thin alternating beds high quality reservoir

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倾斜摄影模型交互式建筑自动成图方法

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测绘通报 2021年第S1期 308-311页

作者：王果胡青峰龚天浩陈超河南工程学院土木工程学院河南郑州451191 华北水利水电大学测绘与地理信息学院河南郑州450046

利用无人机倾斜摄影三维模型进行建筑物制图现阶段仍受制于快速自动化的建筑成图方法。本文提出一种利用倾斜摄影模型的建筑物交互式自动成图方法。该方法在三维模型加载与坐标系选择的基础上,通过响应全局键盘按键进行建筑类型选择,利... 详细信息

利用无人机倾斜摄影三维模型进行建筑物制图现阶段仍受制于快速自动化的建筑成图方法。本文提出一种利用倾斜摄影模型的建筑物交互式自动成图方法。该方法在三维模型加载与坐标系选择的基础上,通过响应全局键盘按键进行建筑类型选择,利用面面求交并水平投影进行特征点采集,对模型遮挡或变形区域采用二维直线求交点和垂足方法采集,借助自编CASS简码和简码识别完成建筑自动成图。通过实测数据进行试验,结果表明,本文方法能取得较好的效果,提高了内业处理和成图速度,具有高效和自动化程度高的特点。

关键词：无人机倾斜摄影三维模型交互式建筑物自动成图

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牵引流化重力流沉积过程与堆积机制:以渤海湾盆地歧口凹陷为例

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地质科技通报 2020年第1期39卷 95-104页

作者：王华陈思巩天浩余政宏黄传炎张悦辉赵睿中国地质大学(武汉)构造与油气资源教育部重点实验室武汉43008 中国地质大学(武汉)资源学院武汉43008

以具备牵引流特色的重力流沉积体为载体的高效储集体,是陆相湖盆沉积学研究与勘探突破的重要领域.渤海湾盆地歧口凹陷沙一段发育的大规模多期次陆相重力流具有其沉积特征的独特性(面积约940km2,纵向分布厚度约1.1km).依据水动力条件及... 详细信息

以具备牵引流特色的重力流沉积体为载体的高效储集体,是陆相湖盆沉积学研究与勘探突破的重要领域.渤海湾盆地歧口凹陷沙一段发育的大规模多期次陆相重力流具有其沉积特征的独特性(面积约940km2,纵向分布厚度约1.1km).依据水动力条件及沉积过程机制,存在层级递进继承型、渐进过渡型、兼并融合型3种牵引流与重力流动力学过程,细分为泥质碎屑流、砂质碎屑流、过渡型同生流、(高密度-低密度悬浮)似涌浪浊流、(高密度-低密度)准稳态浊流5种机制类型,并依据其发育背景识别出了滨海地区中央隆起带上以重力流水道为主导特征的水道型重力流沉积体系和受次洼地貌控制的面流型重力流.本研究细化了沉积动力学过程-堆积机制-沉积相-岩相一体化的关联性,确定了牵引流化重力流发育的关键控制因素.作为极具潜力的优质储层目标,陆相牵引流化重力流沉积体的研究成果在丰富理论体系的同时,对油气勘探新领域的拓展与突破具重要意义,具备生产实践价值,对于其他陆相湖盆油气勘探具有重要的借鉴作用.

关键词：牵引流化重力流陆相湖盆高效储集体沉积过程堆积机制

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大跨悬索桥主缆温湿度长期监测与分布规律

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科学技术与工程 2017年第14期17卷 309-313页

作者：田浩曹素功李晓娅张勇马如进浙江省交通运输科学研究院杭州311305 同济大学桥梁工程系上海200092

长期处于潮湿易腐蚀环境中的悬索桥主缆受到太阳辐射和空气对流的影响,很可能生锈断裂而影响大桥的安全。以西堠门大桥主缆系统为研究对象,为数值研究其温湿度变化机理提供物性参数,设计主缆室外温湿度监测试验。根据太阳运行轨迹提出... 详细信息

长期处于潮湿易腐蚀环境中的悬索桥主缆受到太阳辐射和空气对流的影响,很可能生锈断裂而影响大桥的安全。以西堠门大桥主缆系统为研究对象,为数值研究其温湿度变化机理提供物性参数,设计主缆室外温湿度监测试验。根据太阳运行轨迹提出了一种主缆太阳辐射模型,计算了不同工况日的年概率统计分布并对典型工况日的气温日变化函数曲线进行了拟合。研究结果表明:锚室内温湿度变化平稳,不易受外界环境影响,鞍座内温湿度变化剧烈,受外界环境影响较大;晴天工况下主缆温度受太阳辐射影响显著,而降雨/雪会使气温下降进而影响其太阳辐射规律。

关键词：大跨悬索桥主缆温湿度监测分布规律

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歧口凹陷中部沙一下亚段异重流沉积识别特征与控制因素分析

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地质科技通报 2022年第4期41卷 69-83页

作者：巩天浩吴琳娜陈思潘凯余政宏张悦辉中国地质大学(武汉)教育部构造与油气重点实验室武汉430074 中国地质大学(武汉)资源学院武汉430074 中国石油冀东油田分公司勘探开发研究院河北唐山063000

分析陆相断陷湖盆异重流沉积的识别特征、异重流水下扇沉积体系的横向、垂向沉积序列、以及不同物源碎屑成因的异重流的沉积差异性,从而探讨陆相断陷湖盆中异重流沉积的控制因素。以歧口凹陷沙一下异重流沉积为研究对象,对研究区钻井岩... 详细信息

分析陆相断陷湖盆异重流沉积的识别特征、异重流水下扇沉积体系的横向、垂向沉积序列、以及不同物源碎屑成因的异重流的沉积差异性,从而探讨陆相断陷湖盆中异重流沉积的控制因素。以歧口凹陷沙一下异重流沉积为研究对象,对研究区钻井岩心、测录井、地震属性以及粒度分析资料进行综合分析。结果表明,研究区异重流具有3种典型沉积识别特征:①两类沉积序列,分别为下部逆粒序、上部正粒序的纺锤状二元结构沉积序列以及厚度较大且粒度特征变化不明显的均一结构沉积序列;②粒度分析特征以递变悬浮载荷为主,累计概率曲线类型以复杂多段式、上拱曲线式、低斜率两段式为特征;③岩相特征为侵蚀充填沉积、广泛发育且类型多样的层理构造,其次为陆源褐红色泥质层、褐红色泥砾以及大量的植物茎干碎片和炭质碎屑。研究区异重流沉积接受多支物源供给表现出水道化特征,葛沽物源为最主要物源,总体具有长距离搬运、多个朵体发育、大范围沿路沉积等特征。建立了研究区扇三角洲和辫状河三角洲物源重力流沉积模式。断陷湖盆背景下异重流沉积的控制因素为古物源、古地貌、古气候3个方面,异重流沉积是断陷湖盆中广泛发育的沉积类型,其中异重流水道砂岩具有良好的储集物性,是陆相断陷湖盆油气勘探的重要方向与突破点。

关键词：异重流歧口凹陷断陷盆地沉积特征控制因素

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基于模糊控制的无人车编队重构方法

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沈阳理工大学学报 2023年第6期42卷 40-47页

作者：张滢石宜金龚天昊丽江文化旅游学院信息学院云南丽江674199 丽江文化旅游学院科研处云南丽江674199 沈阳理工大学自动化与电气工程学院沈阳110159

针对多无人车系统(MUVs)在运动过程中因车道发生变化导致无人车编队困难、极易发生车队与车道碰撞等问题,提出基于模糊控制的无人车编队重构方法。首先通过领航跟随者法为MUVs设计编队控制器,保证无人车队可以在行进过程中稳定保持初始... 详细信息

针对多无人车系统(MUVs)在运动过程中因车道发生变化导致无人车编队困难、极易发生车队与车道碰撞等问题,提出基于模糊控制的无人车编队重构方法。首先通过领航跟随者法为MUVs设计编队控制器,保证无人车队可以在行进过程中稳定保持初始队形;再通过设计模糊控制器,将道路信息和车队信息相关联,建立车道到车队距离及其变化率和车队纵向预期距离之间的模糊推理关系,并据此进行无人车编队重构。实验表明,MUVs通过模糊控制算法的智能调节可以适应较为复杂的车道环境变化,自适应调整自身结构,提高整体稳定性和安全性。

关键词：多无人车系统编队重构领航跟随者法模糊控制

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