Mo-W Interdiffusion and the Influence on Potassium Bubbles in W Lamp Wire

1996 ◽  
Vol 458 ◽  
Author(s):  
B. P. Bewlay ◽  
C. L. Briant ◽  
M. L. Murray
Keyword(s):  
High Temperature ◽  
Tungsten Wire ◽  
Heat Treatments ◽  
Diffusion Couples ◽  
Microstructural Changes ◽  
Heat Treated ◽  
Temperature Heat ◽  
Microprobe Data ◽  
Equiaxed Grains

ABSTRACTThe effects of Mo contamination on the microstructure of lamp-grade tungsten wire are investigated in this study. Mo is often used as the mandrel material in the coiling of lamp filaments, and when utilized during high temperature heat treatments significant amounts of Mo can diffuse into the W. In this study, W-Mo diffusion couples were prepared and heat treated at temperatures of 2500°C and above to intentionally contaminate the W with Mo. After dissolution of the Mo and additional high temperature heat treatments of the W, equiaxed grains were observed in the W and excessive porosity was also observed. Explanations for these microstructural changes are discussed. Microprobe data were also obtained to quantify interdiffusion between the W and Mo.

Pyrolysis Characteristic of Nitrogen in Carbon Fibers during High-Temperature Heat Treatment

2015 ◽  
Vol 723 ◽  
pp. 752-756
Author(s):  
Ai Jun Gao ◽  
Zuo Guang Zhang ◽  
Liang Hua Xu
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Carbon Fibers ◽  
Amorphous Region ◽  
Pyrolysis Mechanism ◽  
High Temperature Heat Treatment ◽  
Heat Treated ◽  
Temperature Heat ◽  
Graphite Sheets ◽  
Temperature Heat Treatment

Pyrolysis mechanism of nitrogen in carbon fibers, heat-treated at various temperatures, was investigated, in relation to the nitrogen chemical bonding states. Nitrogen content shows exponential decreasing with increased temperature and extended time. The pyrolysis of nitrogen exhibited time-temperature equivalence. Nitrogen atoms containing hydrogen in the amorphous region and at the edge of microcrystalline, and the double-bonded nitrogen in pyridine rings are easily pyrolyzed, while nitrogen atoms in the six-member ring of the graphite sheets are difficult to be pyrolyzed.

Measurement of Long Range Order in the γ’ Phase of Nickel-Base Superalloys

1969 ◽  
Vol 13 ◽  
pp. 598-608
Author(s):  
J.R. Mihalisin
Keyword(s):  
High Temperature ◽  
Long Range ◽  
Range Order ◽  
Long Range Order ◽  
X Ray Diffraction ◽  
High Temperature Heat Treatment ◽  
Heat Treated ◽  
Temperature Heat ◽  
Long Time ◽  
Nickel Base

The long range order parameter (S) has been measured at room- temperature on the γ’ phase extracted from IN-731 and alloys 713C and 713LC by x-ray diffraction techniques. Measurements were obtained from specimens of IN-731 and alloy 713LC in the as-cast condition and after long time rupture testing. The alloy 713 c specimens were in the as-cast and high temperature heat treated conditions.It was found that long range order in the γ’ phase of IN-731 and alloy 713LC was changed very little after long time rupture testing, and after high temperature heat treatment in the case of alloy 713C.

Hole Traps Produced by High-Temperature Heat Treatments of Silicon Above 1300 °C

1990 ◽  
Vol 120 (1) ◽  
pp. K11-K14 ◽  
Author(s):  
Y. Kamiura ◽  
M. Yoneta ◽  
F. Hashimoto
Keyword(s):  
High Temperature ◽  
Heat Treatments ◽  
Temperature Heat

EFFECTS OF HEAT TREATMENTS ON THE ON-LINE SERVICE LIFE OF A PRESS DIE MANUFACTURED BY W-EDM

2008 ◽  
Vol 22 (31n32) ◽  
pp. 5631-5636
Author(s):  
KYE-KWANG CHOI ◽  
YONG-SHIN LEE
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Service Life ◽  
Heat Treatments ◽  
Electric Discharge Machining ◽  
Manufacturing Method ◽  
High Temperature Heat Treatment ◽  
Temperature Heat ◽  
On Line ◽  
Temperature Heat Treatment

Effects of heat treatments on the on-line service life of a press die manufactured by W-EDM are studied. In this work, four manufacturing processes for a press die are considered: (1) milling and then grinding, (2) wire-cut electric discharge machining (W-EDM), (3) low temperature heat treatment after W-EDM, and (4) high temperature heat treatment after W-EDM. On-line punching experiments for an automobile part of BL646-chain are performed. The amount of wear of the die and punch, roll-over and burnish depth in the punched chain are measured every 1,000 strokes. Overall productivities are carefully compared. Finally, it is concluded that heat treatment after W-EDM for a press die can enhance its on-line service life. Especially, high temperature heat treatment after W-EDM is very attractive as a fast and cheap manufacturing method for a press die.

scholarly journals Nanostructural Analyses of Intra- and Intergranular Precipitates in High-temperature Heat-treated Nitrogen-added Austenitic Stainless Steel

2018 ◽  
Vol 58 (8) ◽  
pp. 1459-1466 ◽  
Author(s):  
Minoru Ochi ◽  
Kousei Sato ◽  
Ryo Teranishi ◽  
Yukio Sato ◽  
Jun-ichi Hamada ◽  
...  
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Austenitic Stainless Steel ◽  
Heat Treated ◽  
Temperature Heat
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