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A New Advance in the Development of High-performance SiC_p/Al Composite

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Journal of Materials Science & Technology 1997年第3期13卷 227-229页

作者： Cui Yan Geng Lin Yao Zhongkai Peng Hongying Li Douxing inst of aeronautical Materials Beijing China

The commercial 6061 aluminium alloy was used as the matrix and high-temperature synthesis (SHS) SiC particulates with a mean size of about 3.5μm as the reinforcement. The aluminum matrix composite has successfully been obtained and is superior in mechanical performance to those composites reinforced with the conventional abrasive-grade SiC particulates. The achievement should be attributed to the reduced extent of local stress concentration arising from the near-spherical geometry of SHS SiC particulate without the edges, and the improved interface bind strength in terms of two kinds of bonding mechanisms including the effective mechanical keying role and atom match bonding with an exact crystallographic orientation relationship.

关键词： SiC Al

OXIDATION RESISTANCE AND MECHANICAL PROPERTIES OF Ti_3Al-Nb-Mo-Si ALLOYS

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Acta Metallurgica Sinica(English Letters) 1995年第Z1期8卷 577-582页

作者： SUN Yufeng CAO Chunxiao CAO Jingxia YAN Minggao (beijing institute of aeronautical Materials,beijing,100095),P.R.China beijing inst of aeronautical Materials Beijing China

In the present paper,the development of Ti3Al-Nb-Mo-Si alloys for high oxidation resistance is *** of weight gain of alloys with different Nb and Si addition is tested,the evaluation of comprehensive mechanical properties has been taken,include the room-temperature and 700℃ tensile properties,thermal stability,creep rupture and fracture toughness of the alloys,It has shown that the oxidation resistance and mechanical properties were significantly affected by the variation of Nb and Si *** composition with the best balance of properties is Ti-24Al-13Nb-1.5Mo-0.5Si and Ti-24Al-15Nb-1.5Mo,which is mush higher than that of Super,α_2 alloy (Ti-25Al-10Nb-3V-1Mo).

关键词： Ti_3Al alloy oxidation resistance mechanical properties

STRESS CORROSION CRACKING IN 16NiCo STEEL

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Acta Metallurgica Sinica(English Letters) 1997年第3期10卷 256-262页

作者： P.Zhang B.Z Guand B. Ling (beijing institute of aeronautical Materials, beijing 100095, China) beijing inst of aeronautical Materials Beijing China

The dst of tempering temperature on strength, impact toughness, fracture toughness and stress corrosion cracking (SCC) behavior of 16NiCo Steel in an aqueons solutiou of 3.5 pct NaCl was stndied. The test compromise between strength, tonghness, and SCC resistance was obtained after 510℃ tempering. Under these conditions, KISCC is~75 MPam with fracture toughness of~75 MPam, impact toughness of~150J/cm2 and a gield strength of~1580 MPa. The improved stress corrosion crack-ing resistance at 510℃ tempering may be related to the loss of stress resulting from M2C/matrix coherency and the recovery of the dislocalion substrvcture. These would lead to a decreased concentration of hydrogen.

关键词： streas corrosion secondary hardeing 16NiCo steel

CORROSION PROTECTION OF Al CATHODES IN ZINC ELECTROLYSIS

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Acta Metallurgica Sinica(English Letters) 1999年第3期12卷 221-228页

作者： Lu, F. Van Ooij, W.J. beijing inst of aeronautical Materials Beijing China

A new pretreatment or a coating for Al was developed and tested to protect the Al effectively from corrosion when it was connected to pure zinc at electroplating potential and exposed to an acidic sulfate solution. It was found out that (1) Al alloy purity and electroplating potential have a large effect on galvanic corrosion between Zn-Al couples; (2) BTSE silane pretreatment and polyurethane coating have better performance in corrosion protection, which are evaluated by EIS, salt spray test and immersion test for Al cathodes in Zinc electrolyte; (3) BTSE treatment or BTSE plus polyurethane coating has the best anti-corrosion performance and can protect the Al cathode effectively in zinc electrolysis.

关键词： Aluminum Electrolysis

HREM STUDY OF GRAIN BOUNDARY PHASES IN Fe-Ni-Co-Nb-Ti SUPERALLOY

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Acta Metallurgica Sinica(English Letters) 1996年第6期9卷 595-600页

作者： R.M. Wang C.Z. Li S. W. Zhang and M.G.Yan(1)institute of aeronautical Materials, beijing 100095, China 2)Laboratory of Atomic Imaging of Solids, institute of Metal Research, Chinese Academy of Sciences,Shenyang 110015, China 3)beijing Laboratory of Elect beijing inst of aeronautical Materials Beijing China

The microstructures of the grain boundary phases in Fe-Ni-Co-Nb-Ti superalloy have been studied by high resolution electron microscopy (HREM).Besides the Laves phase,three other grain boundary phases have been found and analyzed. The ε phase particles are needle-like with some stacking faults along the(0001) direction. The dominant phase at the grain boundaries is the orthorhombic phase that is also rod-like. High reselution image also confirms the existence of the triclinic phase at the grain boundaries that is irregular and scarce.

关键词： high resolution electron microscopy grain boundary phase,FeNi- Co superalloy

R & D OF CAST SUPERALLOYS AND PROCESSING FOR GAS TURBINE BLADES IN BIAM

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Acta Metallurgica Sinica(English Letters) 1996年第6期9卷 457-463页

作者： Y.F. Han and R.Z. Chen(institute of aeronautical Materials, beijing 100095,China ) beijing inst of aeronautical Materials Beijing China

Research and development of cast superalloys and processing for turbine blades in BIAM during the last 35 years have been reviewed briefly in this paper.

关键词： cast nickel base superalloy turbine blade ceramic core shell Mold

INFLUENCES　OF　SULPHUREOUS　IMPURITY　AND　MICROSHRINKAGE　ON　HAC　BEHAVIOR　OF　SUPER－STRENGTH　STEEL

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Acta Metallurgica Sinica(English Letters) 1996年第6期9卷 619-625页

作者： S.K.He G.S. Wang and S.N. Wang(beijing institute of aeronautical Materials,beijing 100095,) beijing inst of aeronautical Materials Beijing China

Influences of sulphureous impurity and micro-shrinkage on hydrogen assisted cracking (HAC) and fracture behavior of the super-strength low-alloy steel 40CrMnSzMo VA have been studied in this *** way of scanning electron microfractography (SEM)and electron probe microanalyser to investigate the fractography of material constantly strained to failure, it was found that the microscopic segregation of sulphureous impurity and micro-shrinkage not only increased strongly the susceptibility to hydrongen embrittlement (HE), but also made the HAC to initiate preferably in such regions with the assistant of stress induced diffusion of hydrogen. The microscopic observation revealed that the steel has commonly intergranular (IG) and quasi-cleavage (QC)features around the segregation of sulphureous impurity and micro-shrinkage for their strong effects of irreversible traps for hydrogen.

关键词： micro-shrinkage sulphureous impurity HAC HE susceptibility

SPRAY FORMED NICKEL-BASE SUPERALLOYS

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Acta Metallurgica Sinica(English Letters) 1996年第6期9卷 523-529页

作者： Z. Li S.F. Tian X.G. Zhao Z.K. Liang L.P. Ren G.F.Mi and M.G. Yan(Bejing institute of aeronautical Materials,beijing 100095,China ) beijing inst of aeronautical Materials Beijing China

In this paper,part of the research and development work in the field of spray formed superalloys at BIAM of China is briefly summarized. With an experimental spray forming facility,whose melting capacity is suitable for making disk and columnar shaped integral-dense and clean Ni-base superalloy preforms with low oxygen content,fine grain, uniform chemistry and improved forgeability, a series of Ni-base superalloys have been spray atomized and deposited, among which three alloys have been chosen for microstructural and mechanical properties evaluation.

关键词： spray forming spray atomization and deposition superalloy

SOLUTION TREATMENT EFFECTS IN COBALT-NICKEL SECONDARY HARDENING STEEL

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Acta Metallurgica Sinica(English Letters) 1996年第6期9卷 613-618页

作者： P. Zhong B. Ling and B.Z. Gu(beijing institute of aeronautical Materials, beijing 100095, beijing inst of aeronautical materials Beijing China

Effect of the austenitizing temperature on the microstructure,strength, and toughness of 16NiCo and 23NiCo alloys was studied. With increasing austenitizing temperature, the reductions in strength and hardness are probably caused by the coarsening of M_2C carbides. The use of higher austenitizing temperature resulted in improved impact toughness due to the dissolution of undissolved (Cr, Fe, Mo)_(23)C_6 *** the austenitizing temperature is increased to 1050℃ for 16NiCo and 23NiCo alloys impact toughness levels are reduced on average by 31 and 53 J/cm￣2 *** use of 1050℃ austenitizing temperatures resulted in intergranular fracture for 23NiCo alloy in 482℃ aged condition. It was suggested that this grain boundary embrittlement was the result of the formation of cementite particles during ageing.

关键词： secondary hardening ultrahigh strength steel austenitizing temPerature