Laser shock peening rounds influencing microstructural and mechanical properties of 300M steel

Abstract

Laser shock peeing (LSP) was introduced to produce surface gradient structures on 300M steel to improve its performance, service life and related workpiece safety. The influences of LSP rounds on microstructural and mechanical properties were investigated to optimise the LSP processing. Smoother surface, surface nanocystallization, and gradient structure, hardness, compressive residue stress was observed LSP. Strength and plasticity of 300M steel improved significantly due to the surface changes induced by one round of LSP. However, excessive LSP rounds tend to deteriorate the surface roughness and mechanical properties despite increased surface nanocrystallization, hardening zone depth and compressive residual stress.

KEYWORDS:

• 300M steel
• surface gradient nanostructures
• laser shock peening
• microstructural evolution
• mechanical properties

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by National Natural Science Foundation of China: [Grant Number U1804146]; National Natural Science Foundation of China: [Grant Number 51905153]; National Natural Science Foundation of China: [Grant Number 52111530068]; Academy of Finland: [Grant Number 311934]; Education Department of Henan Province: [Grant Number 16A430005]; Science and Technology Innovation Team of Henan University of Science and Technology: [Grant Number 2015XTD006]; Foreign Experts Introduction Project of Henan Province: [Grant Number HNGD2020009]; Program for Science, Technology Innovation Talents in Universities of Henan Province: [Grant Number 17HASTIT026].