Formation of surface layer on cast iron cylinder bore due to nanosecond laser impulses

Kornél Májlinger,Péter J Szabó,Kristóf Bobor

doi:10.3311/pp.me.2009-2.04

Kornél Májlinger, Péter J Szabó + Show 1 more

Open Access

https://doi.org/10.3311/pp.me.2009-2.04

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Abstract

The air pollution emission standards for automobiles are going to be more strict worldwide. European automotive manufacturer makes a laser treatment on the cast iron cylinder bores of the V-engine blocks. Samples of laser treated cast iron cylinder bore with lamellar graphite were investigated. Seven samples were treated with XeCl-excimerlaser, Nd-YAG laser and Yb-fiber laser sources. In order to evaluate the microstructure and grain size of the laser treated layer, scanning electron microscopic (SEM) images were taken in cross section with a SEM/focused ion beam (FIB) dual beam electron microscopes. All the samples were found to be ultra fine grained. To simulate the heating conditions during laser treatment, finite element method (FEM) simulations were made for the different lasertypes. Additional X-ray diffraction measurements showed retained austenite after laser treatment.

Highlights

The automotive engine development is defined by three main factors: (I) to make the engines more cost effective, (II) to keep the environmental regulations and (III) the increasing fuel prices, which means that by even higher engine power the fuel and oil consumption should not increase, and the engines should have a long lifetime [1]
To improve mechanical and tribological properties of cast iron cylinder bores it is possible to use special mechanical [2] and laser structuring treatments [3], or – which is used by a large European automotive manufacturer – a special laser treatment on the V-block engines to alter the properties of the cylinder bores
Formation of surface layer on cast iron cylinder bore due to nanosecond laser impulses block has to be rotated around the laser output window which For these simulations 8-node 2D quadratic elements were used

Summary

Introduction

The automotive engine development is defined by three main factors: (I) to make the engines more cost effective, (II) to keep the environmental regulations and (III) the increasing fuel prices, which means that by even higher engine power the fuel and oil consumption should not increase, and the engines should have a long lifetime [1]. Keywords laser treatment · cast iron · cylinder bore · FEM simulation · FIB Kornél Májlinger Department of Materials Science and Engineering, BME, H-1111 Budapest, Bertalan Lajos u. Kristóf Bobor Department of Materials Science and Engineering, BME, H-1111 Budapest, Bertalan Lajos u.

Results

Conclusion