Home  |  About Journal  |  Editorial Board  |  Instruction  |  Subscribe  |  Advertisement  |  council  |  Contact Us  |  中文

Forthcoming Articles       Current Issue       Advanced Search       Archive       Download Articles       Read Articles       Email Alert

Quick Search     Adv Search   2015 Vol. 25, No. 04 Published: 2015-08-10   1 Recent development of new type powder metallurgy superalloys in Russia ZHANG Yi-wen, ,CHI Yue, ,LIU Jian-tao, DOI: 10.13228/j.boyuan.issn1006-6543.20150021 The latest development of new type BBП series(ВВ750П, ВВ751П, ВВ752П and ВВ753П) powder metallurgy(PM) superalloy designed for the fifth generation and fifth-and-one-half generation of aircraft engine (Russia division) were introduced. The PM superalloy discs are produced by directly hot isostatic pressing powders atomized by plasma rotating electrode process (PREP). The mechanical properties of BBП series PM superalloys, such as tensile strength, endurance strength at 650 ℃ and low cycle fatigue life are superior to those of ЭП741НП PM superalloy, while the plasticity and toughness of BBП series PM superalloys are inferior to those of ЭП741НП PM superalloy. BBП series PM superalloys components such as turbine discs meet the design requirements of the fifth generation and fifth-and-one-half generation of aircraft engine in Russia. The ВВ751П and ВВ752П superalloys has sound strength, and can be used as hot section components, such as turbine disc, which working at 650-700 ℃. The ВВ750П and ВВ753П PM superalloys has sound strength at higher temperature, and can be used as hot section components, such as turbine disc, which working above 750 ℃. In Russia, ВВ750П superalloys discs for turbine and compressor are in industrial batch production stage, ВВ751П superalloys discs have been applied in ПД14 and РД-133 engines, while the discs of ВВ752П and ВВ753П superalloys are presently in trial manufacturing stage. 2015 Vol. 25 (04): 1-14 [Abstract] ( 0 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 15 Combustion synthesis of ferrovanadium nitride and related theory basis WANG Sheng-hong,LIU Ke-zhong,JIN Xin-cui DOI: 10.13228/j.boyuan.issn1006-6543.20140089 The fundamental and related theory for combustion synthesis of ferrovanadium nitride was studied. As combustion synthesis is on the base of “solid flame” study, some characteristics related to solid flame were described. The combustion synthesis process of ferrovanadium nitride and its metallurgy characteristics were also introduced. 2015 Vol. 25 (04): 15-19 [Abstract] ( 1 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 20 Effects of gas atomization pressure on the characteristics of Sn0.3Ag0.7Cu lead-free solder powder HAN Shuai,ZHAO Mai-qun,WANG Zi-yu,LI Shao-meng DOI: 10.13228/j.boyuan.issn1006-6543.20140060 Sn0.3Ag0.7Cu lead-free solder powders were prepared by supersonic gas atomization equipment. The scanning electron microscope and laser particle size analyzer were used to characterize the microstructure and size distribution of the powder, respectively. The method of mass difference after reaction between solder powders was used to calculate the oxygen content of powders. The effects of gas pressure on the effective atomization rate, powder microstructure, size distribution and oxygen content were investigated. The results indicate that the gas pressure has great influence on the effective atomization rate, powder microstructure and size distribution of the powders. The effective atomization rate increases with the gas pressure increasing. The sphericity of the powders is better under higher gas pressure, while it is best when the gas pressure is 0.6 MPa. The powder size becomes smaller as the gas pressure increasing, which decreases slowly under higher pressure. The oxygen content of the powders increases slightly with the gas pressure increasing, causing bad powder surface. 2015 Vol. 25 (04): 20-25 [Abstract] ( 1 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 26 Effect of hot extrusion on properties of SiC/2024Al composites HU Zhi-yong,YAN Li-peng,WANG Ai-qin DOI: 10.13228/j.boyuan.issn1006-6543.20140058 The 35%SiC/2024Al (mass percent) composite was prepared by cold pressing and sintering, and then the specimen was hot-extruded. The microstructure of the material was observed by optical microscope and TEM, the physical and mechanical properties were also tested. The distribution characteristic of SiC particles, change of grains in matrix and the strengthening mechanism of the composite were investigated. The results show that the distribution of SiC particles is more uniform and the segregation decreases after hot-extrusion. The arrangement of SiC particles in the direction of extrusion is more oriental and orderly. The grains of the composite are refined. The densities and tensile strength are increased significantly after hot-extrusion. 2015 Vol. 25 (04): 26-29 [Abstract] ( 0 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 30 Effect of equal channel angular pressing routes on microstructure of sintered aluminum powder HUA Rui, LI Ping, XUE Ke-min, SONG Qun-chao DOI: 10.13228/j.boyuan.issn1006-6543.20140081 Effect of equal channel angular pressing (ECAP) routes (A, BC and C route) on the microstructure and grain refinement of sintered aluminum powder was studied through optical microscope, transmission electron microscope and finite element simulation. The results show that BC route is the best one to optimize sintered aluminum powder, which refines grain size effectively, and the microstructure distribution uniformity of aluminum powder is improved. The forming of dislocation slipping can be attributed to the characteristics of crystalline structure and the relationship between the shear force during the accumulated deformation and the grains orientation. After the severe shearing of ECAP, the disorderly distribution of the initial grains shows a single orientation. When the value of adjacent shear planes angle closes to the soft orientation of metal slip system moved easily, the occurrence of dislocation slip is increased. 2015 Vol. 25 (04): 30-35 [Abstract] ( 2 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 36 Study on friction and wear properties of multivariate ceramics/Cu composite ZENG Zhao-feng DOI: 10.13228/j.boyuan.issn1006-6543.20140101 Copper-matrix friction material with SiC, Si3N4 and B4C multivariate ceramic particles was fabricated by powder metallurgy through vacuum sintering technology. Wear resistance of the composites were studied on MRH-3 wear testing machine. The effect of SiC, Si3N4 and B4C multivariate ceramic was studied. The results show that the composites have high heat resistance, wear resistance and bending strength, etc. Hardness, bending strength and wear resistance of the composite increase firstly and then decrease with the ceramic particles content increasing when the mass percent of ceramic is 15%, 25% and 35%. The friction coefficient is stable at around 0.49, which is not affected apparently by temperature fluctuations. The addition of ceramic particles has some influence on the thermal conductivity, thus the wear resistance is also affected. 2015 Vol. 25 (04): 36-41 [Abstract] ( 0 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 42 Strengthening and toughening technology research of tungsten carbide materials and apparatus YU Chao-qing,YI Li,LIU Xue-mei,REN Xiao-mei,HE Xiao-lin,HE Jiao DOI: 10.13228/j.boyuan.issn1006-6543.20140073 The Ni and Al powder was added into WC powder, the Ni3Al binder phase was synthesized through liquid phase sintering by powder metallurgy process. WC-Ni3Al hard composite materials and apparatus with binder phase of Ni3Al have high strength, toughness and oxidation resistance, which have important industrial application prospect. 2015 Vol. 25 (04): 42-46 [Abstract] ( 0 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 47 Comparative study of?molybdenum caps made by die forming?and MIM ZHU Wu,HOU Hai-tao,JIANG Qi-feng,ZHENG Chun-cai DOI: 10.13228/j.boyuan.issn1006-6543.20140086 Differences between the molybdenum?caps prepared by die forming and MIM were studied systematically, to provide reference?for the following?process design. The results indicate that the molybdenum?caps made by die forming are better than those made by MIM on the aspects of appearance，welding strength and cap strength, while die forming and MIM both has its good points on size control. 2015 Vol. 25 (04): 47-53 [Abstract] ( 0 ) HTML (1 KB)  PDF  (0 KB)  ( 1 ) 54 Introduction of control measures for powder aggregation LIU Jian, DOI: 10.13228/j.boyuan.issn1006-6543.20150020 The formation reasons of powder aggregation were analyzed. The advantages and disadvantages of powder aggregation and controlling methods and measures of powder aggregation in gas and liquid medium were discussed. The significance of acquisition and control of powder aggregation was summarized at last. 2015 Vol. 25 (04): 54-57 [Abstract] ( 1 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 58 Current research status of Mo alloys JU Yan-peng, WANG Ai-qin, DOI: 10.13228/j.boyuan.issn1006-6543.20150017 The research status and development of molybdenum powder, TZM, rare-earth molybdenum alloys, Si-Al-K doped molybdenum alloys, Mo-Cu and Mo-Na alloy were introduced. The application of molybdenum alloys in the material engineering field was also briefly described. 2015 Vol. 25 (04): 58-62 [Abstract] ( 1 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 63 New research and applications of bio-3D printing ZHANG Hong-bao,HU Da-chao DOI: 10.13228/j.boyuan.issn1006-6543.20140069 Bio-3D printing is an important bio-manufacturing technique, which is the extension of manufacturing from using single structural materials and functional materials to using biological materials and life materials, but also the cross-integration of engineering, materials, information, life sciences and other disciplines. The concept, features and applications of biological 3D printing technology were introduced. The rapid developing cell printing and organ printing technology were described with emphasis, and the latest development trends in biological 3D printing technology was introduced. 2015 Vol. 25 (04): 63-67 [Abstract] ( 0 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 68 The current research status of SHS coating technology HU Ya-qun,ZHOU Ze-hua,WANG Ze-hua,XUE Xiao-feng DOI: 10.13228/j.boyuan.issn1006-6543.20140096 The preparation processes of self-propagating high-temperature synthesis (SHS) coating were introduced, including SHS casting coating, SHS gas-transmission coating, SHS sintered coating and SHS reactive thermal spraying coating. The preparation process, properties and characteristics of different coating technology were analyzed. The main existing problems were put forward, and the development trend was also prospected. 2015 Vol. 25 (04): 68-73 [Abstract] ( 1 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 74 CAD of injection mold for elbow part LI Bin DOI: 10.13228/j.boyuan.issn1006-6543.20140074 Combined cavities and core-pulling mechanism were used for the elbow parts forming, which has high automation degree, thus the production efficiency was improved. The software of Moldflow was used to simulating the injection process and the working process of mold. The results show that the mold structure is reasonable, which can meet the technologic requirements of elbow parts. 2015 Vol. 25 (04): 74-77 [Abstract] ( 1 ) HTML (1 KB)  PDF  (0 KB)  ( 2 )

Copyright © Editorial Board of Powder Metallurgy Industry Supported by:Beijing Magtech