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Size-dependent Initial Sintering Temperature of Ultrafine Particles

Qing JIANG(Dept. Materials Science and Engineering , Jilin University of Technology , Changchun 130025 , China)Frank G.Shi(School of Engineering , University of California , Irvine , CA 92697-2575 , USA)

材料科学技术（英）

A model for the size-dependent initial sintering temperature of ultrafine particles was established. The theoretical predictions for the size-dependent sintering temperatures of W, Ni and Ag ultrafine particles are consistent with available experimental evidence

关键词:

Influence of Ti on MC Carbide in M2 Steel

Yanjun LI(Shcool of Materials Science and Engineering , Harbin Institute of Technology , Harbin 150001 , China)Qichuan JIANG , Yuguang ZHAO and Zhenming HE(Dept. of Metallic Materials , Jilin University of Technology , Changchun 130025 , China)

材料科学技术（英）

Influence of Ti on MC carbide of M2 high speed Steel was investigated by experimental observation, thermodynamic calculation and crystallographic calculation. With addition of Ti into M2 steel, large quantities of dispersed TiC particles formed in the steel melt at higher temperature than that of the formation of MC carbide. TiC can act as heterogeneous nuclei for the crystallization of MC carbide particles, and therefore promote the formation of blocky MC carbide.

关键词:

EFFECT OF MODIFICATION ON CARBIDE GRANULATION AND ITS MECHANISM

S.Q. Wang , Q.C. Jiang , X.H. Cui and Z.M. He(School of Materials Science and Engineering , Jilin University of Technology , Changchun 130025 , China) Manuscript received in revised form 15 September 1998

金属学报(英文版)

By the modification, network carbide was disconnected at 1100℃ through uneven dissolution at higher energy places in carbide, where there is twin or lattice distortion,and granulated at 1130℃ through element diffusion. The stability of M7C3 carbide was decreased owing to the modification reducing the segregations of Cr and M0, thus the temperature, at which uneven dissolution of carbide commenced, was decreased. Also lattice distortion or defect such as twin in carbide was increased by the modification, which prompted widespread disconnections in carbide. In addition, the modification prompted element diffusion to accelerate the kinetics process of carbide granulation.

关键词: ledeburite steel , null , null , null

CALORIMETRY OF PARTIAL MARTENSITIC TRANSFORMATIONS

LI Jianchen , NAN Shenghui and JIANG Qing.(Department of Materials Science and Engineering , Jilin University of Technology , Changchun 130025 , China)Manuscript received 20 Angust 1995 , in revised form 7 April 1996

金属学报(英文版)

Partial thermoelastic martensitic transformations have been studied by calorimetry on CuAlNi single crystals with special methods. The chemical enthalpy change, the elastic energy stored at the interfaces or inside of the martensite and the energy dissipated in acoustic emission were calculated for a partial transformation; the relationship among them was studied based on measured latent heat and transformation temperatures. The influence of specimen shape on the stored elastic energy was evaluated and discussed.

关键词: : partial martensitic transformation , null , null , null

Wettability of CuNi-Ti Alloys on Si_3N_4 and Interfacial Reaction Products

Chuangeng WAN , Huaping XIONG and Zhenfeng ZHOU (Dept. of Materials Science and Engineering , Jilin University of Technology , Changchun 130025 , China)(To whom correspondence should be addressed)

材料科学技术（英）

Based on the alloy Cu55Ni45 (at pct), holding the proportion of Cu to Ni in constant and in the temperature range of 1233~1573 K, the wetting angles of CuNi-0~56 at pct Ti alloys on Si3N4 have been measured by the sessile drop method. With the increase of Ti content, the wetting angles decreased. The equilibrium wetting angle was 5° when Ti content ≥32 at pct.In the case of same Ti content, the activity of Ti in CuNiTi alloy was weaker than that in CuTi alloy The cross-section of the CuNiTi-Si3N4 interface and the elements distribution were examined by scanning electron microscope with X-ray wave-dispersion spectrometer, and the reaction products formed at the interface were determined by X-ray diffiaction analysis method.

关键词:

IMPROVEMENT OF CARBIDE MORPHOLOGY AND MECHANICAL PROPERTIES OF Cr12MoV STEELS

X.H. Cui , Q.C. Jiang , S.Q. Wang and Z.M. He (School of Materials Science and Engineering , Jinn University of Technology , Changchun 130025 , China)

金属学报(英文版)

Compared with conventional cast Cr12Mo V steel and forged Cr12Mo V steels, carbide morphology and properties of modified cast Cr12MoV steels were investigated by performing hardness test, impact test, fracture toughness test, fatigue crack propagation test, metallographic examination and quantitively metallographic analysis. The results indicate that the carbide morphology in modified cast steel is characterized by granular carbide uniformed- distributed, which is different from that of conventional cast steel, but similar to that of forged steel. The impact toughness of modified cast steel is distinctly increased to 12.75J/cm2 from 6.8J/cm2 in the conventional cast steel with networked carbide, because of carbide granulation. Furthermore, The fracture toughness and fatigue - cock-propagation threshoid of modified cast steel are not only higher than that of the conventional cast steel, but also higher than that of the forged steels.

关键词: carbide , null , null , null , null

Revision of a CCT Diagram of the Simulated ADI Weld Metal and Its Application in Actual Welding

Deyuan LI , Zhenfeng ZHOU and Daqian SUN (Jilin University of Technology , Changchun 130025 , China)Chengji SHAO(Shenyang Polytechnical University , Shenyang 110023 , China)

材料科学技术（英）

A continuous cooling transformation (CCT) diagram of the simulated ADI weld metal has been developed by means of the Formastor-F diagram measurement apparatus, and revised by comparing with the actual welding. Finally the revised diagram was used to determine the welding technology

关键词:

Packing Densities and Glass Forming Ability of Alloys

Qing JIANG , Xiaoya XU , Hongjun NIU and Xiaoxia LU(Dept. of Materials Science and Engineering , Jilin University of Technology , Changchun 130025 , China)

材料科学技术（英）

The random closed packing fraction of hard balls of three different sizes were measured by use of the Archimedes method. This packing fraction increases as the kind of balls with different sizes increases. The packing fraction is related to the mixing entropy of an ideal solution in respect to the holes among the hard balls. The composition zone of La-Al-Ni amorphous alloy made by cooling the alloy melt with a cooling rate of 90 Ks-1 is located at same zone of the largest values of packing fraction and mixing entropy of hard balls in the ternary system. where the proportion of atom sizes of La, Al and Ni is similar to that of hard balls. The packing fraction and the mixing entropy are qualitatively considered as one of the criteria of the glass forming ability of alloys

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