Study on mechanical properties in the laser spot center of Fe-Ni elastic alloy induced by laser shock processing

PEI Xu; WU Jian-hua; JIANG Suo-qin; XU Zhao-mei

In order to study the rebound phenomenon of mechanical properties in the spot center of metallic material induced by laser shock processing,Ni42CrTiAl,a Fe-Ni elastic alloy material,was processed by high-energy neodymium glass pulse laser.Then the distribution of the residual stress on the elastic alloy surface was tested with an X-ray strain gauge.The results showed that there was a high distribution of residual compressive stress in the shocked region and there was a rebound phenomenon of mechanical properties in the spot center region where the residual stress values slightly less than its surrounding area.And then for the purpose of further studying the distribution of the residual stress induced by laser shock processing,the finite elementsimulation software was introduced to simulate the shocking experiment.The simulation results showed that there was also a high distribution of residual compressive stress in the shocked region and a rebound phenomenon of mechanical properties in the spot center region.The simulation results are in good agreement with the measurement.Finally the formation mechanism of rebound phenomenon of the material mechanical properties in the center region was explored from the angle of the movement,the reflection and the reverse effect of the shock wave.This study result is benefit to optimize the process of the laser shock processing and laser parameter selection.

Corresponding author: PEI Xu, peixuu@126.com;

1. Digital Manufacturing Technology Laboratory, Huaiyin Institute of Technology, Huaian 223003, China;

2. School of Mechanical Engineering, Huaiyin Institute of Technology, Huaian 223003, China

Received Date: 2011-07-13

Accepted Date: 2011-08-11

Available Online: 2012-05-25

Abstract: In order to study the rebound phenomenon of mechanical properties in the spot center of metallic material induced by laser shock processing,Ni42CrTiAl,a Fe-Ni elastic alloy material,was processed by high-energy neodymium glass pulse laser.Then the distribution of the residual stress on the elastic alloy surface was tested with an X-ray strain gauge.The results showed that there was a high distribution of residual compressive stress in the shocked region and there was a rebound phenomenon of mechanical properties in the spot center region where the residual stress values slightly less than its surrounding area.And then for the purpose of further studying the distribution of the residual stress induced by laser shock processing,the finite elementsimulation software was introduced to simulate the shocking experiment.The simulation results showed that there was also a high distribution of residual compressive stress in the shocked region and a rebound phenomenon of mechanical properties in the spot center region.The simulation results are in good agreement with the measurement.Finally the formation mechanism of rebound phenomenon of the material mechanical properties in the center region was explored from the angle of the movement,the reflection and the reverse effect of the shock wave.This study result is benefit to optimize the process of the laser shock processing and laser parameter selection.

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Reference (15)

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Study on mechanical properties in the laser spot center of Fe-Ni elastic alloy induced by laser shock processing

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通讯作者: 陈斌, bchen63@163.com

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