scholarly journals FATIGUE BEHAVIOR OF PEARLITIC S.G. CAST IRONS AFTER LASER SURFACE HEAT TREATMENTS

1991 ◽  
Vol 01 (C7) ◽  
pp. C7-81-C7-86
Author(s):  
Y. GUAN ◽  
D. PANTELIS ◽  
D. CHAMBOLLE ◽  
S. PARENT-SIMONIN ◽  
Ph. POUPEAU
Keyword(s):  
Fatigue Behavior ◽  
Heat Treatments ◽  
Surface Heat ◽  
Laser Surface ◽  
Cast Irons ◽  
Surface Heat Treatments

Development of a model for the simulation of laser surface heat treatments with use of a physical simulator

2017 ◽  
Vol 26 ◽  
pp. 262-268 ◽  
Author(s):  
E. Liverani ◽  
D. Sorgente ◽  
A. Ascari ◽  
L.D. Scintilla ◽  
G. Palumbo ◽  
...  
Keyword(s):  
Heat Treatments ◽  
Surface Heat ◽  
Laser Surface ◽  
Surface Heat Treatments

Hybrid fuzzy logic control of laser surface heat treatments

2007 ◽  
Vol 254 (4) ◽  
pp. 879-883 ◽  
Author(s):  
José Antonio Pérez ◽  
José Luis Ocaña ◽  
Carlos Molpeceres
Keyword(s):  
Fuzzy Logic ◽  
Fuzzy Logic Control ◽  
Heat Treatments ◽  
Surface Heat ◽  
Laser Surface ◽  
Logic Control ◽  
Surface Heat Treatments

Study on Thermal Fatigue Resistance of Non-Smooth Cast Iron Treated by Laser Surface Alloying of CrNi Powders

2011 ◽  
Vol 291-294 ◽  
pp. 1405-1411
Author(s):  
Tong Xin ◽  
Zhou Hong ◽  
Liu Min
Keyword(s):  
Cast Iron ◽  
Fatigue Resistance ◽  
Thermal Fatigue ◽  
Fatigue Behavior ◽  
Laser Surface ◽  
Surface Alloying ◽  
Laser Melting ◽  
Cast Irons ◽  
Laser Surface Alloying ◽  
Thermal Fatigue Resistance

The past studies indicated that thermal fatigue resistance of cast irons could be improved by partly laser melting treatment. However the only disadvantage of this technology is that the enhancement of thermal fatigue resistance would be limited because of the fixed chemical composition of sample matrix. For this purpose, the laser surface alloying of CrNi was selected for changing both the compositions and the microstructures of laser treated zone, and the effects of alloy powder compositions on thermal fatigue behavior were also investigated in this paper. The results indicate that the alloy elements distribute homogeneously, and their contents increase markedly in the non-smooth unit on the alloyed layer. The non-smooth unit is strengthened further compared with laser melting treatment. Thermal fatigue resistance of cast iron is enhanced evidently by laser surface alloying of CrNi powders, and for all samples tested, those treated with 25%Cr-75%Ni powders have the best thermal fatigue resistance.

Temper Bead Welding, a Possible Solution to Possible Removal of Heat Treatments

2019 ◽  
Vol 1153 ◽  
pp. 16-20
Author(s):  
Horia Dascău
Keyword(s):  
Heat Treatments ◽  
Surface Heat ◽  
Surface Heat Treatments

The papers aim is to detail temper bead realization, as a possible solution to the removal of heat treatments. Applying temper beads could be a solution for repair, in case surface heat treatments are required, provided they are correctly applied. The paper presents the main ways of applying temper beads, presenting in the same time what the outcomes could be in case of not respecting the prescribed work sequence.

Fatigue Characteristics of Laser Surface-Hardened Cast Irons

1987 ◽  
Vol 109 (3) ◽  
pp. 179-187 ◽  
Author(s):  
P. A. Molian
Keyword(s):  
Continuous Wave ◽  
Fatigue Behavior ◽  
Fatigue Tests ◽  
Case Depth ◽  
Laser Surface ◽  
Low Alloy Steels ◽  
Surface Layers ◽  
Cast Irons ◽  
Co2 Gas ◽  
Alloy Steels

Contrary to expectations, laser surface heat treatment has a deleterious effect on the fatigue performance of pearlitic gray and ductile cast irons. A 1.2 kW, continuous wave, CO2 gas laser, operating in square beam mode, was employed to heat-treat the surfaces of standard fatigue specimens. Rotational-bending fatigue tests were then conducted on untreated (as-cast) and laser treated specimens. Results indicated that the effect on fatigue behavior of case depth, microstructure and hardness of laser-hardened surface layers were opposite to that observed in carbon and low alloy steels. A fracture model based on the presence of graphite, residual stresses, and strain-induced transformation is postulated to explain the adverse effect of laser hardening of cast irons.

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