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Journal of Materials Science & Technology 2006年第6期22卷 775-778页

作者： Zhifu HUANG jiandong xing Anfeng ZHANG School of Material＇s Science and Engineering Xi＇an Jiaotong University Xi＇an 710049 China School of Mechanical Engineering Xi＇an Jiaotong University Xi＇an 710049 China

In this paper, the ring-type ingot of hypereutectic high Cr cast iron was obtained by slope cooling bodycentrifugal casting method （SC-CCM）, and its microstructure and impact toughness were investigated, respectively. The results indicated that, first, the primary carbides in the microstructure are prominently finer than those in the hypereutectic high Cr cast iron prepared by conventional casting method. Second, in the ring-type ingot, the primary carbides near radial outer field are finer than those near radial inner field; furthermore, there is dividing field in the microstructure. Finally, the impact toughness values of the specimens impacted on the radial outer face and on the radial inner face are improved respectively about 36% and 138% more than that of the hypereutectic high Cr one prepared by conventional casting method.

关键词： Slope cooling body-centrifugal casting method Hypereutectic high Cr cast iron Primary carbides Microstructure Impact toughness

Microstructure, mechanical properties and toughening mechanism of directional Fe2B crystal in Fe-B alloy with trace Cr addition

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Journal of Materials Science & Technology 2020年第22期54卷 172-179页

作者： Yongxin Jian Zhifu Huang Xiaoting Liu Jialin Sun jiandong xing State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXian710049China

Exploring the effective way to improve Fe2 B's toughness has always been the hot topic in the researches of Fe-B wear resistant *** the present work,the effects of Cr on the microstructure,mechanical properties and lattice structure of directional Fe2 B have been *** affecting mechanism of Cr addition has been discussed according to the experimental and first-principle calculation *** results show Cr addition can improve the toughness of directional Fe2 B on the longitudinal sections perpendicular to(002) crystal plane,without sacrificing the hardness *** toughening mechanism by Cr substitution has been revealed:Cr addition enriches the electron density between the B atoms along [002] direction,contributing to the shrinkage of the bond length and the enhancement of the bond strength of B-B *** obtained results provide insight into the intrinsic reason for toughening Fe2 B by Cr doping.

关键词： Directional Fe2B Cr addition Lattice evolution Toughening mechanism

Effect of interaction between cementite and pearlite on two-body abrasive wear behaviors in white cast iron

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Friction 2021年第6期9卷 1378-1389页

作者： Baochao ZHENG Wei LI Xiaohui TU jiandong xing Suocheng SONG Institute of Advanced Wear&Corrosion Resistant and Functional Materials Jinan UniversityGuangzhou 510632China State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China

The wear interaction of cementite and pearlite in the white cast iron(WCI)was investigated using the two-body abrasive wear test under contact loads of 20,35,and 50 *** wear behavior,wear surface morphology,sub-surface structure,and wear resistance were evaluated using X-ray diffraction,microhardness testing,and *** results indicated that when the Cr content was increased from 0 to 4 wt%,there was a significant increase in the microhardness(H)and elasticity modulus(E)of the *** yielded a 15.91%-and 23.6%-reduction in the degree of wear resistance and surface roughness,***,no spalling and breaking of cementite was observed with increasing Cr content during the wear process,indicating improved wear resistance of the bulk *** addition,the hard phase(cementite)and tough matrix(pearlite)composite structure exhibited a good protective and supporting ***,it was concluded that the interaction mechanism of the wear phase contributed to the reduction of the wear weight loss of the composite during the wear *** contribution of the interaction between the hard wear-resistant phase and the tough phase in WCI to the wear resistance decreased with increasing hardness of the pearlite matrix.

关键词： two-body abrasive wear white cast iron(WCI) wear resistance interaction

Arc Erosion Behavior of Cu–0.23Be–0.84Co Alloy after Heat Treatment: An Experimental Study

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Acta Metallurgica Sinica(English Letters) 2016年第4期29卷 399-408页

作者： Yanjun Zhou Kexing Song jiandong xing Zhou Li Xiuhua Guo State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi’an Jiaotong University Collaborative Innovation Center of Nonferrous Metals Henan University of Science and Technology School of Materials Science and Engineering Henan University of Science and Technology School of Materials Science and Engineering Central South University

The arc erosion behavior of Cu-0.23Be-0.84Co alloy after heat treatment was investigated experimentally by a JF04C electric contact test system. The arc duration, arc energy, contact resistance and contact pressure of Cu-0.23Be- 0.84Co alloy after solution treatment and aging treatment were analyzed. The arc erosion morphologies were contrastively observed by a three-dimensional measuring system and scanning electron microscopy. For the Cu-0.23Be-0.84Co alloy in solution state and aging state, the maximum values of arc duration are 90 and 110 ms, and the arc energies are 15,000 and 18,000 mJ, respectively. The maximum value of the contact resistance of Cu-0.23Be-0.84Co alloy in different states is about 33 mΩ The contact pressure of Cu-0.23Be-0.84Co alloy in solution state generally changes between 50 and 60 cN during whole make-and-break contacts, while in aging state, it has a larger fluctuation range. Moreover, the quality of moving contact （anode） decreases, while static contact （cathode） increases. The materials transfer from anode to cathode during make-and-break contacts. The total mass losses of Cu-0.23Be-0.84Co alloy in solution state and aging state are 3 and 1.2 mg, respectively. In addition, a number of discrete corrosion pits, molten droplet, porosity and cavity distribute on the surface of moving contact and static contact. The arc erosion model of Cu-0.23Be-0.84Co alloy in make-and-break contact was built. The arc erosion resistance of Cu-0.23Be-0.84Co alloy after heat treatment is closely related to the microstructure and the properties of contact materials. This experimental study is important to evaluate the anode or cathode electrocorrosion fatigue life.

关键词： Cu-Be-Co alloy Arc erosion Aging Morphology

A study of microstructure and properties of cast Fe-10Cr-1.5B alloy

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China Foundry 2014年第3期11卷 185-190页

作者： Zhang Haibin Cen Qihong Fu Hanguang Lei Yongping xing jiandong School of Materials Science and Engineering Beijing University of Technology School of Materials Science and Engineering National Engineering Research Center of Waste Resource Recovery Kunming University of Science and Technology State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong University

In the present study, the microstructure and mechanical properties of cast Fe-10Cr-1.5B（FCB） alloy after different heat treatments were studied. The results showed that the as-cast microstructure of FCB alloy consists of α-Fe, M（M=Cr, Fe, Mn）2（B, C） and M（M=Cr, Fe, Mn）7（C, B）3 type borocarbides, and small amounts of pearlite and austenite. After oil quenching treatment, metal matrix transformed into the martensite from the mixture of martensite, pearlite and austenite. There are many M（M=Cr,Fe,Mn）23（C,B）6 type borocarbide precipitates in the metal matrix, and eutectic borocarbide appears with an apparent disconnection and isolated phenomenon. When the quenching temperature reaches 1,050℃, the hardness of FCB alloy is the highest, but the change of quenching temperature has no obvious effect on impact toughness of FCB alloy. After tempering, the eutectic microstructure of FCB alloy appears with a ＂two links＂ trend. With the increase of tempering temperature, the hardness of FCB alloy decreases gradually and impact toughness increases gradually. Cast FCB alloy oil-quenched from 1,050℃ and tempered from 200℃ has excellent combined properties; its hardness and impact toughness are 61.5 HRC and 8.8 J·cm^-2 respectively.

关键词： Fe-Cr-B alloy solidification microstructure heat treatment mechanical property

A Review on Binderless Tungsten Carbide: Development and Application

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Nano-Micro Letters 2020年第1期12卷 158-194页

作者： Jialin Sun Jun Zhao Zhifu Huang Ke Yan Xuehui Shen jiandong xing Yimin Gao Yongxin Jian Hejie Yang Bo Li State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049People’s Republic of China Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE School of Mechanical EngineeringShandong UniversityJinan 250061People’s Republic of China Key Laboratory of Education Ministry for Modern Design and Rotor‑Bearing System Xi’an Jiaotong UniversityXi’an 710049People’s Republic of China School of Mechanical and Automotive Engineering Qilu University of TechnologyJinan 250353People’s Republic of China

WC-Co alloys have enjoyed great practical significance owing to their excellent properties during the past *** the advantages,however,recently there have been concerns about the challenges associated with the use of Co,*** instability,toxicity and properties degeneration,which necessitates the fabrication of binderless tungsten carbide(BTC).On the other hand,BTC or BTC composites,none of them,to date has been commercialized and produced on an industrial scale,but only used to a limited extent for specialized applications,such as mechanical seals undergoing high burthen as well as high temperature electrical *** are two challenges in developing BTC:fully densifying the sintered body together with achieving a high ***,this review applies towards comprehensively summarize the current knowledge of sintering behavior,microstructure,and mechanical properties of BTC,highlighting the densification improving strategies as well as toughening methods,so as to provide reference for those who would like to enhance the performance of BTC with better reliability advancing them to further wide applications and prepare the material in a way that is environment friendly,harmless to human health and low in production *** paper shows that the fabrication of highly dense and high-performance BTC is economically and technically *** properties of BTC can be tailored by judiciously selecting the chemical composition coupled with taking into careful account the effects of processing techniques and parameters.

关键词： Binderless tungsten carbide Sintering Densification Toughening Mechanical properties

Effect of partial remelting time on the initial carbide in semisolid structure of hypereutectic high Cr cast iron

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China Foundry 2004年第2期1卷 112-116页

作者： Zhifu HUANGI jiandong xing Wei HE Ding LI School of Materials Science and Engineering Xi’an Jiaotong UniversityXi’an 710049ShanxiP.R.China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072Shanxi P.R.China

In order to review the effect of partial remelting time on the morphology of initial carbides, semisolid ingots of hypereutectic high Cr17 cast iron were remelted at 1270℃ for four different times, and the changing characteristics of shape factor and the equivalent diameter of initial carbides were analyzed quantitatively using a Leica image analyzer. The results indicate that firstly, the evolution process of the initial carbides' morphology undergoes melting, spheroidization and refining during the partial remelting; secondly, the solute diffusion and interface tension take dominant roles at the primary and the middle-final stages respectively in the process of initial carbide evolution; finally, a perfect structure can be obtained by remelting semisolid ingots at 1270℃ for 15 min.

关键词： semisolid hypereutectic high Cr cast iron partial remelting time image analysis morphology of initial carbides

形变AZ91D镁合金重熔过程中共晶激活能研究

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稀有金属材料与工程 2008年第2期37卷 354-356页

作者：王武孝邢建东西安交通大学

采用DSC技术研究了SIMA法制备半固态AZ91D镁合金坯料过程中形变率与共晶熔化激活能的关系。结果表明:形变AZ91D镁合金内部存在位错、孪晶缺陷,合金的共晶熔化激活能随变形率的增大而变小,当形变率达到40%时,共晶熔化激活能下降很少;共... 详细信息

采用DSC技术研究了SIMA法制备半固态AZ91D镁合金坯料过程中形变率与共晶熔化激活能的关系。结果表明:形变AZ91D镁合金内部存在位错、孪晶缺陷,合金的共晶熔化激活能随变形率的增大而变小,当形变率达到40%时,共晶熔化激活能下降很少;共晶熔化开始温度随变形率的增大略有下降。

关键词：镁合金应变诱发熔化激活法(SIMA) 形变率共晶熔化激活能 DSC

K-RE变质处理改善Fe-V-W-Mo合金性能的研究

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稀有金属材料与工程 2005年第8期34卷 1287-1290页

作者：符寒光李定邢建东清华大学北京100084 西安交通大学陕西西安710049

研究了K-RE变质处理对Fe-V-W-Mo合金机械性能和热物理性能的影响。结果发现,Fe-V-W-Mo合金经K-RE变质处理后,硬度和红硬性略有增加,冲击韧性提高41.82%,达到11.09J/cm2,耐磨性和导热系数提高,热膨胀系数减小。分析了K-RE改善Fe-V-W-Mo... 详细信息

研究了K-RE变质处理对Fe-V-W-Mo合金机械性能和热物理性能的影响。结果发现,Fe-V-W-Mo合金经K-RE变质处理后,硬度和红硬性略有增加,冲击韧性提高41.82%,达到11.09J/cm2,耐磨性和导热系数提高,热膨胀系数减小。分析了K-RE改善Fe-V-W-Mo合金性能的机理,并制造了K-RE变质Fe-V-W-Mo合金轧辊,在热轧生产中使用获得了良好的效果。

关键词：合金性能变质处理热物理性能热膨胀系数机械性能冲击韧性导热系数 RE Mo

重熔时间对半固态过共晶高铬铸铁初生相的影响

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西安交通大学学报 2005年第3期39卷 282-285页

作者：皇志富邢建东贺伟西安交通大学材料科学与工程学院西安710049

为考察触变重熔时间对初生碳化物形貌的影响,对Cr17过共晶高铬铸铁半固态坯料在1 270 ℃进行了部分重熔,重熔时间分别为5、15、25和30 min,并借助Leica图像分析仪分别定量描述了碳化物形状因子及粒度因子的变化规律.研究表明:碳化物形... 详细信息

为考察触变重熔时间对初生碳化物形貌的影响,对Cr17过共晶高铬铸铁半固态坯料在1 270 ℃进行了部分重熔,重熔时间分别为5、15、25和30 min,并借助Leica图像分析仪分别定量描述了碳化物形状因子及粒度因子的变化规律.研究表明:碳化物形貌的演化过程包括3个阶段,即熔断阶段、球化和细化阶段及合并长大阶段;碳化物演化过程是溶质原子扩散和相界面张力共同作用的结果,且分别在触变重熔初期和中后期占主导地位;在1 270 ℃部分重熔15 min,可获得理想的重熔组织.

关键词：过共晶高铬铸铁触变重熔图像分析初生碳化物