High-Strength titanium laser welding with a subsequent combination of mechanical and laser heat treatment

2004 ◽  
Author(s):  
B. Block ◽  
H. Haferkamp ◽  
A. Ostendorf ◽  
J. Bunte ◽  
J. Huang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Laser Welding ◽  
High Strength ◽  
Laser Heat Treatment ◽  
Laser Heat

Local laser heat treatment of ultra high strength steels to improve formability

2009 ◽  
Vol 3 (4-5) ◽  
pp. 347-351 ◽  
Author(s):  
Reimund Neugebauer ◽  
Sören Scheffler ◽  
Reinhart Poprawe ◽  
Andreas Weisheit
Keyword(s):  
Heat Treatment ◽  
High Strength Steels ◽  
High Strength ◽  
Laser Heat Treatment ◽  
Laser Heat ◽  
Ultra High Strength Steels

Effect of selective laser heat treatment on geometrical variation in boron steel components: An experimental investigation

2020 ◽  
Vol 235 (1-2) ◽  
pp. 54-64
Author(s):  
Vaishak Ramesh Sagar ◽  
Kristina Wärmefjord ◽  
Rikard Söderberg
Keyword(s):  
Heat Treatment ◽  
High Strength ◽  
Boron Steel ◽  
Laser Heat Treatment ◽  
Laser Heat ◽  
Heat Treated ◽  
Geometrical Variation ◽  
And Performance ◽  
Boron Steels ◽  
Heating Direction

Selective laser heat treatment is a well-known process for its ability to produce tailor heat treated blanks (THTB). Specifically, ultra high strength boron steels with tailored material properties can be produced. However, this process generates unwanted distortion and influences geometrical variation. This in turn can affect functionality, aesthetics, and performance of the final product. Understanding the effects on geometrical variation in the final product or the assembly will enable in designing and producing geometry assured products. In this paper, boron steel blanks were selectively laser heat treated with a specific heat treatment pattern and laser heating direction sequence. These heat treated blanks were then cold formed. Further on, spot welding simulation of the cold formed parts was performed to assess the effect on geometrical variation at the assembly level. The results show that the effect of selective laser heat treatment on geometrical variation at part level propagates further to the assembly level. It implies that the effect on geometrical variation should be minimized at part level, when the blanks are laser heat treated. Hence, the sources that influence geometrical variation at part level when employing selective laser heat treatment are presented and discussed. The motivation and possibilities to minimize the effects in the early design concept stages is provided.

Optimization of the Case Depth of a Cylinder Made With 4340 Steel by a Control of the Laser Heat Treatment Parameters

2018 ◽  
Author(s):  
Rachid Fakir ◽  
Noureddine Barka ◽  
Jean Brousseau
Keyword(s):  
Heat Treatment ◽  
Numerical Model ◽  
Surface Temperature ◽  
Laser Power ◽  
Case Depth ◽  
Maximum Temperature ◽  
Laser Heat Treatment ◽  
Laser Heat ◽  
4340 Steel ◽  
Cylindrical Workpiece

This paper presents a numerical model able to control the temperature distribution along a 4340 steel cylinder heat-treated with Nd: YAG laser. The numerical model developed using the numerical finite element method, was based on a study of surface temperature variation and the adjustment of this temperature by a control of the heat treatment laser power. The proposed analytical approach was built gradually by (i) the development of a numerical model of laser heat treatment of the cylindrical workpiece, (ii) an analysis of the results of simulations and experimental tests, (iii) development of a laser power adjustment approach, and (iv) proposal of a laser power control predictor using neural networks. This approach was made possible by highlighting the influence of the fixed (non-variable) parameters of the laser heat treatment on the case depth, and has shown that it is possible by controlling the laser parameters to homogenize the distribution of the maximum temperature reached on the surface for a uniform case depth. The feasibility and effectiveness of the proposed approach leads to a reliable and accurate model able to guarantee a uniform surface temperature and a regular case depth for a cylindrical workpiece of a length of 50-mm and with a diameter of between 16-mm and 22-mm.

Sub-millisecond post exposure bake of chemically amplified resists by CO 2 laser heat treatment

2010 ◽  
Author(s):  
Byungki Jung ◽  
Jing Sha ◽  
Florencia Paredes ◽  
Christopher K. Ober ◽  
Michael O. Thompson ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Laser Heat Treatment ◽  
Post Exposure ◽  
Chemically Amplified ◽  
Laser Heat ◽  
Post Exposure Bake ◽  
Chemically Amplified Resists

The preparation and performance of grain size gradient TWIP steel fabricated by laser heat treatment

2019 ◽  
Vol 743 ◽  
pp. 294-300 ◽  
Author(s):  
Kun Wang ◽  
Aiping Wei ◽  
Zimu Shi ◽  
Xizhang Chen ◽  
Jixing Lin ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Grain Size ◽  
Twip Steel ◽  
Laser Heat Treatment ◽  
Laser Heat ◽  
And Performance ◽  
Size Gradient

scholarly journals Effect of Laser Heat Treatment on the Microstructure and Properties of Alloy 800H

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 379 ◽  
Author(s):  
Wei Zhang ◽  
Tao Jiang ◽  
Jing Li ◽  
Liqiang Liu
Keyword(s):  
Heat Treatment ◽  
Treatment Process ◽  
Fracture Morphology ◽  
Elemental Content ◽  
Laser Heat Treatment ◽  
Alloy 800H ◽  
X Ray ◽  
Microstructure And Properties ◽  
Fracture Specimen ◽  
Laser Heat

The effects of laser heat treatment on the microstructure and properties of alloy 800H were investigated. The fracture morphology, elemental changes, and phase composition of the specimens were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffractometry (XRD). The results show that the long-lasting life of the specimen after laser heat treatment increased by 28.6%, and the elongation after fracture increased by 20.7%. The macroscopic morphology of the fracture specimen exhibited obvious ductile fracture morphology, and the changes in the elemental content and grain size significantly affected the ductility and toughness of the alloy. This study has certain guiding significance for the optimization of the heat treatment process of this type of alloy.

scholarly journals Increasing the resistance of a NiCrBSi coating to heat wear by means of combined laser heat treatment

2018 ◽  
Author(s):  
A. V. Makarov ◽  
N. N. Soboleva ◽  
M. S. Gibzun ◽  
I. Yu. Malygina ◽  
Yu. S. Korobov
Keyword(s):  
Heat Treatment ◽  
Laser Heat Treatment ◽  
Laser Heat ◽  
Nicrbsi Coating
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