ZHANG Jingguo ZHANG Xiaomin LIN Yijian Shanghai Iron and Steel Research Institute
,
Shanghai
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ChinaKE Jun (T.Ko) University of Iron and Steel Technology Beijing
,
Beijing
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ChinaCHEN Lanying Shanghai Institute of Optic and Fine Mechanics
,
Academic Sinica
,
Shanghai
,
China Senior Engineer
,
Shanghai Iron and Steel Research Institute
,
Shanghai 200940
,
China
金属学报(英文版)
The microstructure of a laser-melted Fe-4% C-10% Sn alloy has been studied.A non-crystalline phase was found in the upper part of the laser-melted zone:At the bottom of the melted zone,however,the microcrystalline zone which consists of α-Fe and a bet phase was observed.Fine twinning martensite exists in the other area of the melted zone.
关键词:
Fe-C-Sn alloy
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null
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null
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WANG Yingshu SUN Fuyu XU Wenchong Central Iron and Steel Research Institute
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Ministry of Metallurgical Industry
,
Beijing
,
China Senior Engineer
,
Department No.13
,
Central Iron and Steel Research Institute
,
Ministry of Metallurgical Industry
,
Beijing
,
China
金属学报(英文版)
By means of riM-190 hot-stage microscopy,the in situ observation of α-β transformation in 12Cr2MoWVTiB steel has been carried out.The sequence of the growth of ferritic needles composing bainitic basket has also been determined.According to the crystallographic analy- sis a multislip system transform model concerning the formation of basket has been proposed.
关键词:
α-β transformation
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null
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null
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WANG Jixin Baotou Research Institute of Rare Earth
,
Ministry of Metallurgical Industry
,
Baotou
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China Senior Engineer
,
Baotou Research Institute of Rare Earth
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P.O.Box 131
,
Baotou 014010
,
China
金属学报(英文版)
In the light of estimation model for ternary excess properties,an approximate analytical procedure for ternary Gibbs-Duhem equation was proposed,and verification by previous ternary systems as Cd-Bi-Pb and Zn-In-Cd was also made.
关键词:
Gibbs-Duhem equation
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null
LI Yuqing Research Institute of Daye Steel Works
,
Huangshi
,
China Senior Engineer
,
Research Institute of Daye Steel Works
,
Huangshi
,
Hubei Province 435001
,
China
金属学报(英文版)
The distinct images of intragranular VC were observed on TEM in superalloy GH36 underwent normal heat treatment and prolonged aging.The size of VC particles were meas- ured by means of Moire pattern,and the misfit between VC and austenite was also calculated. The M23C6 enveloped in VC shell was also observed in the prolonged-aged specimens.The coherent relation between intragranular M_(23)C_6 twins and austenite as well as its coherent in- terface were also studied.
关键词:
VC
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null
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null
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HU Zhizhong WU Yusheng CAI Heping MA Lihua Xi′an jiaotong University
,
Xi′an
,
China Senior Engineer
,
Res.Inst.for Strength of Metals
,
Xi′an jiaotong University
,
Xi′an 710049
,
China
金属学报(英文版)
Studies have been made of the torsional fatigue fracture life of notched specimens,the macroscopic fractography and microscopic fracture mechanism of steel 40Cr after various tempering treatments under different stresses,With the increase of stress,the fracture model changes from normal stress fracture to longitudinal shear one,and then transversal shear one. Under same stress,with the increase of strength,the fracture mode transfers from shear to normal stress fracture.The mechanism of normal stress fracture may be:transgranular frac- ture→striation+intergranular fracture→dimple+intergranular fracture,and of shear fracture may be:transgranular fracture→shear trace→dimple.Based on the experimental results,a fracture mechanism map of torsional fatigue has been drawn up.
关键词:
mechanism map
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null
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LI Yuqing WANG Cirong GU Zhaofeng Research Institute of Daye Steel Works
,
Huangshi
,
China Senior Engineer
,
Research Institute of Daye Steel Works
,
Huangshi 435001
,
China
金属学报(英文版)
Determination of(Fe,Cr)_7C_3 in Cr27 cast iron results about 30 v.-%.Minor Si and Mn are present.Sectional area of the M_7C_3 grains is 1—50μm~2.Combining matrix analysis of elec- tron diffraction pattern with calculated angle between plane traces,{011}twins and also {013}twins producing local environment for Ru_7B_3 are observed in the orthorhombic M_7C_3. A crystallographic model for M_7C_3 is proposed.
关键词:
cast iron
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null
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null
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