Influence of laser surface hardening on low cycle fatigue performance of homogeneous-structure super austenitic stainless sheets by laser beam welding

Optik ◽  
2022 ◽  
pp. 168572
Author(s):  
R. Selvabharathi ◽  
P.C. Rajarajan
Keyword(s):  
Laser Beam ◽  
Surface Hardening ◽  
Low Cycle Fatigue ◽  
Laser Beam Welding ◽  
Laser Surface ◽  
Fatigue Performance ◽  
Homogeneous Structure ◽  
Cycle Fatigue ◽  
Laser Surface Hardening

The Research for Control of the Laser Beam Trajectory on Surface Hardening Using NC

2014 ◽  
Vol 624 ◽  
pp. 429-432
Author(s):  
Qing Li Zhang ◽  
Yu Li Jin ◽  
Ming Zhou Wang
Keyword(s):  
Laser Beam ◽  
Surface Hardening ◽  
Programming Model ◽  
Complex Surface ◽  
Laser Surface ◽  
Laser Spot ◽  
Nc Programming ◽  
Laser Surface Hardening ◽  
Surface Laser ◽  
The Difference

Laser surface hardening is widely used. The complexity of the surface restricts its application. To solve this problem, it is necessary to study the path of the laser spot. By comparison the difference of CNC cutting machine and laser processing machines, the control system of laser spot is built. And the method of alignment for work coordinate system is obtained. NC programming model of the laser beam is established using CAM software. The change of area of spot when laser beam projected to the different normal angles surface was analyzed, and it is get the relationship of normal angles and feed rate. The complex surface laser surface hardening is realized.

Structure and Mechanical Properties of 1.4539 Austenic Steel Joints Made by TIG and Laser-Beam Welding

2014 ◽  
Vol 224 ◽  
pp. 99-104
Author(s):  
Zdzisław Bogdanowicz ◽  
Barbara Nasiłowska ◽  
Paweł Jóźwik ◽  
Dariusz Zasada
Keyword(s):  
Laser Beam ◽  
Low Cycle Fatigue ◽  
Laser Beam Welding ◽  
Base Material ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Micro Hardness ◽  
Fatigue Estimation ◽  
Structural Research ◽  
Steel Joints

This paper presents the analysis of structural research, micro-hardness and fatigue properties of the base material which is 1.4539 steel and joints made with CO2laser beam and TIG method. Theoretical and experimental analysis of low cycle fatigue based on deformation criterion was presented. Safe fatigue estimation consistent with the results of experiments was obtained during calculations.

Unconventional Metallographic Methods for the Structural Characterization of Laser Hardened Al-Zn-Si Cast Alloy

2014 ◽  
Vol 782 ◽  
pp. 369-372 ◽  
Author(s):  
Eva Tillová ◽  
Mária Chalupová
Keyword(s):  
Mechanical Properties ◽  
Laser Beam ◽  
Surface Hardening ◽  
Laser Power ◽  
Cast Alloy ◽  
Alpha Phase ◽  
Laser Surface ◽  
Hydraulic Unit ◽  
Laser Surface Hardening ◽  
Eutectic Si

The laser surface hardening is method which provides increased mechanical properties of secondary (recycled) Al-Si cast alloys for automotive industry. Improvement of mechanical properties and structure of secondary aluminium alloys can often significantly increase the lifetime of casting and reduce costs for fuel and reduction of environmental loading. For study was used a laser beam Nd: YAG lasers, BLS 720, on the test samples of secondary cast alloy AlZn10Si8Mg. AlZn10Si8Mg cast alloy are used for engine and vehicle constructions, hydraulic unit and mould making without the need of heat treatment because this alloy is self-hardened. The effect of laser beam was evaluated with the laser power 50 W and 80 W on the surface of samples. The final microstructure of Al-alloys depend on the laser process parameters. The changes of microstructure after laser surface hardening was observed by using classical techniques of etching (standard black-white contrast - etching by 0.5 % HF, 10 % H3PO4and colour contrast - etching by Weck-Al) and deep etching with HCl. Due to the action of laser beam on the surface of the secondary alloy AlZn10Si8Mg there have been changes in the microstructure of the material. Melting area is alpha-phase with much fine columnar dendrites morphology without the presence of Si-particles and intermetallic phases. In the transition area were observed grain refinement of eutectic Si (finer and rounder Si particles) as the modify action of the laser. By increasing the laser power the microhardness of surface layers decreases. In the surface layer (80 W) were observed cracks due to uneven heat transfer of the material.

Low-Cycle Fatigue Performance of Buckling Restrained Braces and Assessment of Cumulative Damage under Severe Earthquakes

2018 ◽  
Vol 763 ◽  
pp. 867-874
Author(s):  
Yu Shu Liu ◽  
Ke Peng Chen ◽  
Guo Qiang Li ◽  
Fei Fei Sun
Keyword(s):  
Fatigue Life ◽  
Energy Dissipation ◽  
Structural Reliability ◽  
Low Cycle Fatigue ◽  
Engineering Application ◽  
Fatigue Performance ◽  
Cycle Fatigue ◽  
Variable Amplitude ◽  
Buckling Restrained Braces ◽  
Energy Dissipation Devices

Buckling Restrained Braces (BRBs) are effective energy dissipation devices. The key advantages of BRB are its comparable tensile and compressive behavior and stable energy dissipation capacity. In this paper, low-cycle fatigue performance of domestic BRBs is obtained based on collected experimental data under constant and variable amplitude loadings. The results show that the relationship between fatigue life and strain amplitude satisfies the Mason-Coffin equation. By adopting theory of structural reliability, this paper presents several allowable fatigue life curves with different confidential levels. Besides, Palmgren-Miner method was used for calculating BRB cumulative damages. An allowable damage factor with 95% confidential level is put forward for assessing damage under variable amplitude fatigue. In addition, this paper presents an empirical criterion with rain flow algorithm, which may be used to predict the fracture of BRBs under severe earthquakes and provide theory and method for their engineering application. Finally, the conclusions of the paper were vilified through precise yet conservative prediction of the fatigue failure of BRB.

scholarly journals Experimental investigation on a novel approach for laser surface hardening modelling

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
L. Orazi ◽  
A. Rota ◽  
B. Reggiani
Keyword(s):  
Surface Hardening ◽  
Carbon Diffusion ◽  
Industrial Applications ◽  
Laser Surface ◽  
Simplified Approach ◽  
Laser Surface Hardening ◽  
Novel Approach ◽  
Laser Treatments ◽  
High Flexibility ◽  
Short Time

AbstractLaser surface hardening is rapidly growing in industrial applications due to its high flexibility, accuracy, cleanness and energy efficiency. However, the experimental process optimization can be a tricky task due to the number of involved parameters, thus suggesting for alternative approaches such as reliable numerical simulations. Conventional laser hardening models compute the achieved hardness on the basis of microstructure predictions due to carbon diffusion during the process heat thermal cycle. Nevertheless, this approach is very time consuming and not allows to simulate real complex products during laser treatments. To overcome this limitation, a novel simplified approach for laser surface hardening modelling is presented and discussed. The basic assumption consists in neglecting the austenite homogenization due to the short time and the insufficient carbon diffusion during the heating phase of the process. In the present work, this assumption is experimentally verified through nano-hardness measurements on C45 carbon steel samples both laser and oven treated by means of atomic force microscopy (AFM) technique.

scholarly journals Laser surface hardening of SS316L

2021 ◽  
Vol 1070 (1) ◽  
pp. 012107
Author(s):  
Ganesh Dongre ◽  
Avadhoot Rajurkar ◽  
Ramesh Gondil ◽  
Nandan Jaju
Keyword(s):  
Surface Hardening ◽  
Laser Surface ◽  
Laser Surface Hardening
Sign in / Sign up

Export Citation Format

Share Document