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2014 Vol. 24, No. 06
Published: 2014-12-10
1
The global development of powder metallurgy industry in 2014
HAN Feng-lin
DOI: 10.13228/j.boyuan.issn1006-6543.20140087
Following a period of severe recession in 2008 and 2009, the global PM industry is once again on a path of sustained growth, as was illustrated in the presentations given by Richard Pfingstler, MPIF President, Philippe Gundermann, EPMA President, and Mamoru Moritani, JPMA President, in the “global trends” plenary session at the PM2014 world congress held in Orlando, May 18-22.
2014 Vol. 24 (06): 1-5 [
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Texture evolution and performance of the rolling tungsten plate during annealing process
LIU Guo-hui, SONG Peng, WU Cheng, QIN Si-gui, GONG Yan-fei, ZHAO Si-xiang, WANG Cheng-yang
DOI: 10.13228/j.boyuan.issn1006-6543.20140036
The tungsten powder with 99.95wt% purity was pressed by CIP method and sintered at 1 800～2 300 ℃ in H2 atmosphere. The sintered tungsten billet was rolled 4 passes at 1 250～1 500 ℃, the tungsten plate with density close to theoretical value was achieved. The texture evolution of tungsten plate during the annealing process was observed by electron backscattered diffraction (EBSD) analysis. High temperature tensile strength and Vickers hardness of the tungsten plate were also tested to investigate the microstructure and properties development during the annealing process. The results show that the tungsten grain stretches along the rolling direction obviously after rolling process and there is no obvious texture change when annealed at 1 150 ℃ and 1 250 ℃ for 10 min. The deformation texture of tungsten plate is decreased and the tungsten grain orientation tends to be random after annealed at 1 350 ℃. The recrystallization ratio of tungsten grain is 65.8% calculated by statistical analysis of the area fraction. The high temperature tensile strength and Vickers hardness decrease with the annealing temperature increasing from 1 150 ℃ to 1 350 ℃. The high temperature tensile strength at 1 000 ℃ is 485 MPa and 356 MPa, respectively. The Vickers hardness is 430 HV and 410 HV, respectively.
2014 Vol. 24 (06): 6-10 [
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Effects of Cr addition on microstructure and mechanical properties of powder metallurgy Ti-6Al-4V alloy
XU Jian, WANG Wen-yan,, ZHANG Hao-yin, XIE Jing-pei,, LI Luo-li
DOI: 10.13228/j.boyuan.issn1006-6543.20140006
Ti-6Al-4V alloy with different Cr content was prepared by the method of cold isostatic pressing and vacuum sintering. The effect of Cr addition on the microstructure and mechanical properties of Ti-6Al-4V alloy was investigated using optical microscope, mechanical properties testing and scanning electron microscope. The results show that the compound TiCr2 does not appear in the alloy after adding Cr element, and the alloy is composed of (α+β) phase, which belongs to widmanstatten structure. The addition of Cr element makes the relative density of the alloy decrease and the compressive strength increase. The compressive strength of the alloy is 1 855 MPa when Cr content is 4wt%. The fracture mode of alloy is ductile fracture when Cr content is 1wt% and 2wt%; while the fracture mode turns to dissociative fracture when Cr content is 3wt% and 4wt%.
2014 Vol. 24 (06): 11-15 [
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16
Effect of atomization method on the hot deformation behavior of PM superalloy FGH98
ZHANG Guo-xing, JIA Jian,, TAO Yu
DOI: 10.13228/j.boyuan.issn1006-6543.20140002
The hot deformation behavior of as-HIPed PM superalloy FGH98 in the temperature range of 1 050-1 150 ℃ and strain rate range of 0.005~1.000 s-1 was investigated by using isothermal constant strain rate compressing tests. The powder was prepared with different atomization methods. On the basis of dynamic material modeling, processing maps for the two atomized billet were established. The results show that the rheological curves of the two kinds of billets are similar. Under the same deformation condition, the peak stress of argon gas atomization (AA) powder billet is lower than that of plasma rotating electrode process (PREP) powder billet. The optimum deformation window for AA powder billet is 1 088-1 108 ℃/0.005-0.016 s-1, the efficiency of power dissipation [η] is higher than 42%. But the optimum deformation window for PREP powder billet is 1 098-1 120 ℃/0.010-0.016 s-1, [η] is higher than 40%.
2014 Vol. 24 (06): 16-22 [
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Experimental research on corrosion resistance of Fe3Al and stainless steel porous material in H2S-containing gas environment
WANG Hao,, YANG Jun-jun,, LIU Guan-ying,, WANG Fan,
DOI: 10.13228/j.boyuan.issn1006-6543.20140016
With the rapid development of cleaning coal technology, more and more attention has been paid on the filtration technology and material in high temperature H2S environment. The mass and permeability change were tested for Fe3Al and stainless steel porous material in H2S environment. The results show that Fe3Al material has excellent corrosion resistance under 2vol% H2S content, while stainless steel porous material has worse corrosion resistance due to the blocked pore structure caused by corrosion product after 1 500 h experiment. Energy spectrum analysis and X-ray diffraction results show that the corrosion products containing sulfur does not form on the surface of Fe3Al, while the corrosion products based on FeS form on the surface of 316L stainless steel.
2014 Vol. 24 (06): 23-27 [
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28
Research on Co-Mn composite material prepared by spark plasma sintering (SPS) process
WANG Guan-zhong, ZHANG Ming-tao, GUO Ping-yi
DOI: 10.13228/j.boyuan.issn1006-6543.20140038
The Co-Mn composite material with excellent microstructure was prepared by the method of spark plasma sintering (SPS) at 800 ℃/45 MPa for 32 min. Morphology and characteristics of the material were discussed. Furthermore, the fitting degree of the SPS theory and actual process combined with the problem of fuse zone and sintering hole defects were analyzed, which was related to theories of molecule kinetics. It aims at optimizing the SPS procedure for Co-Mn composite material preparation and promoting the application of SPS theory in practical production.
2014 Vol. 24 (06): 28-32 [
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33
Influence of SiCp pretreatment on microstructure and performance of SiCp/Al-Si composite
WANG Rong-qi, XIE Jing-pei, WU Wen-jie, WANG Ai-qin
DOI: 10.13228/j.boyuan.issn1006-6543.20130115
SiC particles were pretreated by high temperature roasting and water washing process. SiCp/Al-25Si composite was prepared by vacuum hot pressing. The microstructure and tensile strength of the composite with pretreated or original SiC particles were studied. The results show that the SiCp/Al-25Si composite with pretreated SiC particles has higher interface bonding strength, less pores, and much higher relative density and tensile strength.
2014 Vol. 24 (06): 33-36 [
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Research on sintering temperature of iron-based PM vavle guide
LIU Jian, XUAN Tian-peng, DAI Ze-yu, YUAN Chun
DOI: 10.13228/j.boyuan.issn1006-6543.20140040
Fe-Cu-C vavle guide was prepared by powder metallurgy with two common sintering temperatures, and the microstructure, density, hardness and crushing strength of the samples were tested. The results show that decarburization at high temperature zone is more serious for the samples sintered at 1 150 ℃ compared to the samples sintered at 1 120 ℃, and the pearlite amount and hardness also decrease when sintered at 1 150 ℃. Furthermore, high temperature accelerates the diffusion of copper, leading to increased porosity and decreased density. In consideration of microstructure, properties and production costs, 1 120 ℃ is the suitable sintering temperature.
2014 Vol. 24 (06): 37-41 [
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42
Research status on the wear of PCBN super-hard material cutting tool in machining different cast iron material
LI Pan-lai, ZHANG Feng-lin, BAI Kun
DOI: 10.13228/j.boyuan.issn1006-6543.20140046
Because of high hardness, good wear resistance and chemical stability, the application of PCBN super-hard material cutting tools in the field of automobile manufacturing is becoming more and more widely. Research status on the wear of PCBN cutting tool in machining gray cast iron, nodular cast iron and vermicular cast iron were summarized and analyzed. The wear?mechanisms of PCBN cutting tools in machining three kinds of cast iron were discussed mainly from several aspects, such as cutting tool material, process parameters, workpiece material, cutting conditions and processing way etc.. Finally, the wear situations of tools in cutting different types of cast iron were summarized.
2014 Vol. 24 (06): 42-47 [
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Research progress of boron nitride ceramic composite material produced by hot pressing
LIU Huan, ZHANG Ning, ZHANG Tian-wen, KAN Hong-min,WANG Xiao-yang, LONG Hai-bo
DOI: 10.13228/j.boyuan.issn1006-6543.20140026
The technological craft process and densification process of hexagonal boron nitride composite ceramic produced by hot pressing were reviewed. The factors affecting mechanical properties, heat resistance, processing properties and dielectric properties of AlN/BN, Si3N4/BN and SiC/BN composite ceramic were analyzed. Finally, the future development trend of boron nitride composite ceramic was previewed.
2014 Vol. 24 (06): 48-53 [
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Domestic research progress of Al-Si matrix composites reinforced by SiC particles
WU Wen-jie, WANG Ai-qin, WANG Rong-qi, XIE Jing-pei
DOI: 10.13228/j.boyuan.issn1006-6543.20140001
The development history and preparation methods of SiCp/Al composite were introduced, especially the domestic research situation for SiCp/Al-Si composite. The advantages and main problems of SiCp/Al-Si composite were illustrated and the development prospect of the composite was put forward.
2014 Vol. 24 (06): 54-57 [
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Induction heat treatment of ferrous powder metallurgy gear parts
MA Sheng-rong
DOI: 10.13228/j.boyuan.issn1006-6543.20140043
The selection of induction heat treatment equipment for ferrous powder metallurgy gear parts, and the effects of quenching and tempering parameters on the gear quality were introduced.
2014 Vol. 24 (06): 58-62 [
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63
Powder metallurgy die design for timing pulley
YAN Min
DOI: 10.13228/j.boyuan.issn1006-6543.20140051
Based on the structure features of timing pulley, the powder metallurgy die structure was designed and its working principle was discussed. The timing pulley had the characteristics of center hole, inside and outside steps, so the compensation method was adopted for powder filling, and floating pressing, liftout demoulding with assistant cylinder were also employed. The practice had proved that the die structure is reasonable, product quality is reliable and effect is good. Because there are inner steps within the female die, it requires stable loose density for the powder.
2014 Vol. 24 (06): 63-67 [
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