scholarly journals Fabrication of High Chromium White Iron Surface Layers on Ductile Cast Iron Substrate by Laser Surface Alloying

2017 ◽  
Vol 63 (12) ◽  
Keyword(s):  
Cast Iron ◽  
Ductile Cast Iron ◽  
Laser Surface ◽  
Iron Surface ◽  
White Iron ◽  
Surface Alloying ◽  
Surface Layers ◽  
Laser Surface Alloying ◽  
High Chromium

scholarly journals Microstructural Evolution During Laser Surface Alloying of Ductile Cast Iron with Titanium

2017 ◽  
Vol 62 (4) ◽  
pp. 2425-2431 ◽  
Author(s):  
D. Janicki
Keyword(s):  
Cast Iron ◽  
Solidification Rate ◽  
Titanium Content ◽  
Ductile Cast Iron ◽  
Laser Surface ◽  
Surface Alloying ◽  
Surface Layers ◽  
Composite Surface ◽  
Laser Surface Alloying ◽  
Xrd Diffraction

AbstractDiode laser surface alloying process was used to the in-situ synthesis of TiC-reinforced composite surface layers on the ductile cast iron substrate. The obtained composite surface layers were investigated using optical and scanning electron microscopy, and XRD diffraction.It was found that the morphology and fraction of TiC phase is directly dependent upon both the concentration of titanium in the molten pool and also the solidification rate. With increasing titanium content, the fraction of TiC increases, whereas the fraction of cementite decreases. The TiC phase promotes a heterogeneous nucleation of primary austenite grains, what reduces a tendency of cracking in the alloyed layers.

Fabrication of TiC-Reinforced Surface Layers on Ductile Cast Iron Substrate by Laser Surface Alloying

2020 ◽  
Vol 308 ◽  
pp. 76-99 ◽  
Author(s):  
Damian Janicki
Keyword(s):  
Cast Iron ◽  
Ductile Cast Iron ◽  
Laser Surface ◽  
Surface Alloying ◽  
X Ray Diffraction ◽  
Surface Layers ◽  
Composite Surface ◽  
Laser Surface Alloying ◽  
Novel Method

This chapter presents a novel method for analysis and optimization of the in-situ formation of TiC-reinforced composite surface layers (TRL) on a ductile cast iron substrate during the laser surface alloying process, combining the experimental approach with the computational thermodynamics. The microstructure of the TRLs has been assessed by light optical microscopy, scanning electron microscopy with energy dispersive spectroscopy and X-ray diffraction. The results of thermodynamic calculations with the Scheil-Gulliver model showed a good agreement with the experimental results, indicating that the actual solidification path for the analyzed Fe-C-Si-Ti alloy systems under the investigated range of laser processing conditions is close to the Scheil-Gulliver assumption.

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.

Formation of Lead Bearing Surface Layers on Aluminum Alloys by Laser Alloying

2006 ◽  
Vol 508 ◽  
pp. 99-104 ◽  
Author(s):  
Mária Svéda ◽  
András Roósz ◽  
Gábor Buza
Keyword(s):  
Solid Lubricant ◽  
Volume Fraction ◽  
Laser Surface ◽  
Surface Alloying ◽  
Bearing Surface ◽  
Surface Layers ◽  
Sliding Bearings ◽  
Laser Surface Alloying ◽  
Quantitative Image ◽  
Pin On Disc

The aim of the present work is to investigate the microstructure of Al-Pb monotectic surface layers generated by a laser surface alloying technique on the surface of an Al-4Cu-1.5Si-0.5Mg alloy. Monotectic alloys are generally used as materials for sliding bearings. Layers of a monotectic alloy generated by laser surface alloying have a potential for superior properties, because the rapid solidification during this process results in fine precipitation structures which can act as solid lubricant. The structure of the Al-Pb monotectic surface layers was observed in the light microscope and the scanning electron microscope. Volume fraction and size distribution of lead particles were determined by quantitative image analysis. Pin-on-disc experiments were carried out to characterize and compare the tribological properties of the Al-Pb monotecitc layers and cast Al-Cu-Si-Mg alloys.

Recent Developments in Laser Surface Treatment

1985 ◽  
Vol 58 ◽  
Author(s):  
B.L. Mordike ◽  
H.W. Bergmann
Keyword(s):  
Cast Iron ◽  
Surface Treatment ◽  
Large Scale ◽  
Laser Surface ◽  
Iron Surface ◽  
Scale Transformation ◽  
Surface Alloying ◽  
Laser Surface Treatment ◽  
Recent Developments ◽  
Made In

ABSTRACTSome unrelated examples are given where progress has been made in laser surface treatment in the last few years. These are large scale transformation hardening, reproducible surface melting of cast iron, surface alloying with a reaction with the surrounding atmosphere, fundamental studies of solidification and evaporation cleaning.

Laser Surface Alloying of NiCr-Cr3C2 and C-B-W-Cr Powders on Nodular Cast Iron Rolls

2009 ◽  
Vol 79-82 ◽  
pp. 1459-1462 ◽  
Author(s):  
Gui Fang Sun ◽  
Chang Sheng Liu ◽  
Jing Liang ◽  
Jun Hua Zhou ◽  
Xing Qi Tao
Keyword(s):  
Cast Iron ◽  
Specific Energy ◽  
Nodular Cast Iron ◽  
Element Distribution ◽  
Laser Surface ◽  
Surface Alloying ◽  
Wear Resistant ◽  
Laser Surface Alloying ◽  
Metallurgical Bonding

The laser surface alloying(LSA) technique was firstly used to form wear resistant layers on nodular cast iron rolls with two different powders, A: NiCr-Cr3C2 and B: C-B-W-Cr. The microstructure, element distribution and phases of the layers were investigated. Results indicate that the alloying layers had pores and cracks, as well as a metallurgical bonding with the substrates. For layers with powder A, as the thickness of the pre-layers decreased, the numbers of pores and cracks of the LSA layers decreased but the thicknesses of them were close. Phases were barely influenced by the thickness of the pre-layer, while the content of them were affected. For layers with powder B, as the laser specific energy increased, the numbers of pores and cracks in the LSA layers decreased and the thicknesses of them increased. The microstructure in the layers with different powders was different.

Laser surface alloying of C-B-W-Cr powders on nodular cast iron rolls

2011 ◽  
Vol 205 (8-9) ◽  
pp. 2747-2754 ◽  
Author(s):  
Guifang Sun ◽  
Rui Zhou ◽  
Peng Li ◽  
Aixin Feng ◽  
Yongkang Zhang
Keyword(s):  
Cast Iron ◽  
Nodular Cast Iron ◽  
Laser Surface ◽  
Surface Alloying ◽  
Laser Surface Alloying
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