YU Xuejie Shanghai Iron and Steel Research Institute
,
Shanghai
,
China ZHOU Tianjian Anhui Institute of Technology
,
Hefei
,
China YU Xuejie Senior Engineer
,
Shanghai Iron and Steel Research Institute
,
1001 Taihe Road
,
Wusong
,
Shanghai 200940
,
China
金属学报(英文版)
The mechanical properties and structure of bainite and martensite after tempering m 6-5-4-2 high speed steel have been investigated.It was found that the secondary hardening effect and resistance to heat softening as well as impact toughness are higher in the bainite than in the martensite.TEM observations show that the(Fe,M)_3C precipitated in the martensite after tempering at temperature near the peak of hardness-tempering temperature curve.However, no(Fe,M)_3C but the dispersive MC and M_2C precipitated in the ferrite and austenite of bainite after tempering at the same temperature.This indicates that the diffusion of alloy ele- ments forming carbide might exist during the process of bainite growing.
关键词:
high speed steel
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null
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null
LIANG Yong LI Ruiguo Institute of Metal Research
,
Academia Sinica
,
Shenyang 110015
,
ChinaInstitute of Corrosion and Protection of Metals
,
Aademia Sinica
,
Shenyang
,
110015
,
China
材料科学技术（英文）
Recent advances in laser coating technology including laser cladding,laser surface alloying and laser vapour deposition in China are reviewed in this paper.
关键词:
laser
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null
,
null
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null
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null
B.W. Wang
,
H. Shen
金属学报(英文版)
Ni-Cr System solar selective thin solid films were prepared by d.c. magnetron reactivesputtering under the atmosphere of O2 and N2. Ni-Cr alloy was chosen as targetmaterial and copper sheets as substrate. Using SEM, Spectrophotometer and Talystepto analyze the relations between the selective characteristic and the structure, theformation and the thickness of the thin films. The aim is to obtain good solar selectivethin films with high absorptance and low emittance, which is applied to flat plate solarheat collectors.
关键词:
solar selective thin film
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null
,
null
,
null
