Microstructure and properties of high chrome steel roller after laser surface melting

2009 ◽  
Vol 255 (17) ◽  
pp. 7574-7579 ◽  
Author(s):  
Meiyan Li ◽  
Yong Wang ◽  
Bin Han ◽  
Weimin Zhao ◽  
Tao Han
Keyword(s):  
Surface Melting ◽  
Laser Surface ◽  
Laser Surface Melting ◽  
Steel Roller ◽  
Microstructure And Properties ◽  
Chrome Steel

Structure and Properties of High-Cr Steel Roller by Laser Surface Melting

2009 ◽  
Vol 36 (2) ◽  
pp. 498-502
Author(s):  
李美艳 Li Meiyan ◽  
王勇 Wang Yong ◽  
韩彬 Han Bin ◽  
韩涛 Han Tao ◽  
程义远 Cheng Yiyuan
Keyword(s):  
Surface Melting ◽  
Laser Surface ◽  
Laser Surface Melting ◽  
Structure And Properties ◽  
Steel Roller

High-Temperature Wear Property of High Chrome Steel by Laser Surface Melting

2010 ◽  
Vol 37 (1) ◽  
pp. 302-306
Author(s):  
李美艳 Li Meiyan ◽  
王勇 Wang Yong ◽  
韩彬 Han Bin ◽  
程义远 Cheng Yiyuan
Keyword(s):  
High Temperature ◽  
Surface Melting ◽  
Laser Surface ◽  
Laser Surface Melting ◽  
Wear Property ◽  
Chrome Steel ◽  
High Temperature Wear

Local Microstructure and Hardness Variation After Pulsed Laser Micromelting on S7 Tool Steel

2016 ◽  
Vol 4 (3) ◽  
Author(s):  
Justin D. Morrow ◽  
Frank E. Pfefferkorn
Keyword(s):  
Tool Steel ◽  
Surface Hardness ◽  
Pulsed Laser ◽  
Processing Parameters ◽  
Surface Melting ◽  
Laser Surface ◽  
Laser Surface Melting ◽  
Microstructure And Properties ◽  
Surface Polishing ◽  
Diffusion Controlled

Laser surface melting is being increasingly used as a method of surface polishing steels and other alloys, but understanding the effect of this process on the microstructure and properties is still incomplete. This work experimentally explores several basic questions about how the surface microstructure and properties of S7 tool steel change during a pulsed laser micromelting (PLμM) process. Evaluations of the microstructure and hardness suggest that diffusion-controlled processes such as melt homogenization and surface back-tempering are relevant during rapid microscale laser melting and that the laser parameters and process planning contribute to determining the final surface hardness. The results also suggest that some influence can be exerted over the final hardness obtained from laser surface melting by changing the processing parameters.

Development of Nano-Structured Aluminum Surfaces by LSM

2008 ◽  
Author(s):  
Taha Mattar ◽  
Ehab Abdel Rahman ◽  
Ahmed Abdel-Aziz ◽  
Haytham El-Gazzar
Keyword(s):  
Corrosion Resistance ◽  
Surface Layer ◽  
Surface Structure ◽  
Surface Melting ◽  
Laser Surface ◽  
Laser Surface Melting ◽  
Aluminum Surface ◽  
Yag Laser ◽  
Structured Surface ◽  
Aluminum Surfaces

Aluminum is one of most common metals in all advanced and modern scientific and technological applications including electrical, electronic, chemical, engineering, energy and medical fields. The performance of aluminum alloys determines to large extent the quality and economic status of the different processes. Aluminum surface structure determine its performance where nano sized grains and layer can improve aluminum properties and performance. In this work, the improvement of aluminum surface structure and formation of nano structured surface grains by laser surface melting (LSM) using Nd-YAG laser under argon atmosphere was investigated. Different power and scanning speed were applied. The physical and chemical properties of the produced surfaces were examined. SEM, EDX and XRD analyses were performed and were correlated to hardness results. Corrosion resistance of the treated surface was investigated to evaluate their performance in aggressive media and chemical and medical applications. From the obtained data it can be concluded that Nd-YAG laser surface melting of aluminum results in formation of 750 micron nano-structured surface layer. Adjustment of LSM parameters could produce 100 nm grains or less. The obtained results showed also that LSM under argon can eliminate the formation of Al2O3 surface layer which may deteriorates the performance in certain applications. Surface layer rich in AlN is formed upon LSM. It was concluded also that corrosion resistance of the treated aluminum surfaces was improved to large extent by LSM.

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