scholarly journals Current Development of Laser Surface Beam Welding and Its Prospective Forecast on Locomotive Components Repairing Applications

2017 ◽  
Vol 07 (05) ◽  
pp. 529-535
Author(s):  
昕宇 尤
Keyword(s):  
Laser Surface ◽  
Current Development ◽  
Surface Beam

Microstructures of Laser Processed Fe-Cr Surface Alloys

1981 ◽  
Vol 39 ◽  
pp. 328-329
Author(s):  
P. A. Molian ◽  
K. H. Khan ◽  
W. E. Wood
Keyword(s):  
Cooling Rate ◽  
Pure Iron ◽  
Continuous Wave ◽  
Laser Surface ◽  
Material Surface ◽  
Constitution Diagram ◽  
Incident Power ◽  
Surface Alloying ◽  
Laser Surface Alloying ◽  
Spot Diameter

In recent years, the effects of chromium on the transformation characteristics of pure iron and the structures produced thereby have been extensively studied as a function of cooling rate. In this paper, we present TEM observations made on specimens of Fe-10% Cr and Fe-20% Cr alloys produced through laser surface alloying process with an estimated cooling rate of 8.8 x 104°C/sec. These two chromium levels were selected in order to study their phase transformation characteristics which are dissimilar in the two cases as predicted by the constitution diagram. Pure iron (C<0.01%, Si<0.01%, Mn<0.01%, S=0.003%, P=0.008%) was electrodeposited with chromium to the thicknesses of 40 and 70μm and then vacuum degassed at 400°F to remove the hydrogen formed during electroplating. Laser surface alloying of chromium into the iron substrate was then performed employing a continuous wave CO2 laser operated at an incident power of 1200 watts. The laser beam, defocussed to a spot diameter of 0.25mm, scanned the material surface at a rate of 30mm/sec, (70 ipm).

RESONANT MULTIPHOTON PROCESSES IN LASER-SURFACE INTERACTION

1987 ◽  
Vol 48 (C7) ◽  
pp. C7-443-C7-446
Author(s):  
J. REIF ◽  
H. B. NIELSEN ◽  
O. SEMMLER ◽  
P. TEPPER ◽  
E. MATTHIAS ◽  
...  
Keyword(s):  
Surface Interaction ◽  
Laser Surface ◽  
Multiphoton Processes

Tantangan Pondok Pesantren dalam Menghadapi Era Bonus Demografi

2018 ◽  
Vol 10 (2) ◽  
pp. 409-434
Author(s):  
Ibnu Chudzaifah
Keyword(s):  
Human Resources ◽  
Boarding School ◽  
Educational Institutions ◽  
Human Beings ◽  
Current Development ◽  
The Face ◽  
The Times

Pondok Pesantren is one of the Islamic educational institutions that aim to form human beings who have noble character, so that created a human who has a balance between physical and spiritual. Some educational institutions offer various models of learning to balance the current development so that its existence is still recognized by the community. While boarding school in dealing with the development of the times, has a commitment to make new innovations by presenting the pattern of education that can give birth to a reliable Human Resources. Especially pesantren currently has a challenging enough weight in facing the era of "Demographic Bonus". Demographic bonus is a phenomenon in which the structure of the population greatly benefits the community from the side of development in various sectors, because the productive age is more than the non productive age. This means that the dependency burden will decrease with the ratio of 64 percent of the productive age population to bear only 34 percent of the nonproductive age population. With all kinds of scholarships and skills given to students, students are expected to compete in all fields, especially in the face of Indonesia gold in 2020 to 2035.

Carbon Monoxide Related Reductions

INEOS OPEN ◽  
2020 ◽  
Vol 3 ◽  
Author(s):  
O. I. Afanasyev ◽  
◽  
D. Chusov ◽  
Keyword(s):  
Organic Chemistry ◽  
Carbon Monoxide ◽  
Reducing Agent ◽  
Current Development ◽  
Efficient Route ◽  
Development Prospects

Carbon monoxide is a unique reducing agent that is only gaining popularity in organic chemistry. This review highlights the main approaches to the application of CO as a reducing agent, summarizes and critically analyzes the key trends in this field, and describes the current development prospects. Potentially the most selective and efficient route for the realization of these processes is demonstrated.

Tool steel laser surface modification with TiC

2008 ◽  
Author(s):  
M. A. Montealegre ◽  
G. Castro ◽  
J. L. Arias ◽  
A. Fernández-Vicente ◽  
J. Vázquez
Keyword(s):  
Surface Modification ◽  
Tool Steel ◽  
Laser Surface ◽  
Laser Surface Modification
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