Comparison between Shot Peening, Cavitation Peening, and Laser Peening by Observation of Crack Initiation and Crack Growth in Stainless Steel

The traditional technique used to modify the surface of a metallic material is shot peening; however, cavitation peening, a more recent technique in which shot is not used, was developed, and improvements in the fatigue strength of metallic materials were demonstrated. In order to compare the fatigu...

Full description

Bibliographic Details
Main Author: Hitoshi Soyama
Format: Article
Language:English
Published: MDPI AG 2019-12-01
Series:Metals
Subjects:
Online Access:https://www.mdpi.com/2075-4701/10/1/63
id doaj-f8cae46fd9c140519d5d21874e4c46c7
record_format Article
spelling doaj-f8cae46fd9c140519d5d21874e4c46c72020-11-25T01:54:13ZengMDPI AGMetals2075-47012019-12-011016310.3390/met10010063met10010063Comparison between Shot Peening, Cavitation Peening, and Laser Peening by Observation of Crack Initiation and Crack Growth in Stainless SteelHitoshi Soyama0Department of Finemechanics, Tohoku University, Sendai 980-8579, JapanThe traditional technique used to modify the surface of a metallic material is shot peening; however, cavitation peening, a more recent technique in which shot is not used, was developed, and improvements in the fatigue strength of metallic materials were demonstrated. In order to compare the fatigue properties introduced by shot peening with those introduced by cavitation peening, crack initiation and crack growth in specimens of austenitic stainless steel (Japanese Industrial Standards JIS SUS316L) treated using these techniques were investigated. With conventional cavitation peening, cavitation is produced by injecting a high speed water jet into water. In the case of submerged laser peening, bubbles are generated using a pulsed laser after laser ablation, and the impact produced when the bubbles collapse is larger than that due to laser ablation. Thus, in this study, cavitation peening using a water jet and submerged laser peening were investigated. To clarify the mechanisms whereby the fatigue strength is improved by these peening techniques, crack initiation and crack growth in specimens with and without treatment were examined by means of a <i>K</i>-decreasing test, where <i>K</i> is the stress intensity factor, and using a constant applied stress test using a load controlled plane bending fatigue tester. It was found that the improvement in crack initiation and the reduction in crack growth were roughly in a linear relationship, even though the specimens were treated using different peening methods. The results presented here show that the fatigue strength of SUS316L treated by these peening techniques is closely related to the reduction in crack growth, rather than crack initiation.https://www.mdpi.com/2075-4701/10/1/63cavitation peeningshot peeningcrackfatiguestainless steel
collection DOAJ
language English
format Article
sources DOAJ
author Hitoshi Soyama
spellingShingle Hitoshi Soyama
Comparison between Shot Peening, Cavitation Peening, and Laser Peening by Observation of Crack Initiation and Crack Growth in Stainless Steel
Metals
cavitation peening
shot peening
crack
fatigue
stainless steel
author_facet Hitoshi Soyama
author_sort Hitoshi Soyama
title Comparison between Shot Peening, Cavitation Peening, and Laser Peening by Observation of Crack Initiation and Crack Growth in Stainless Steel
title_short Comparison between Shot Peening, Cavitation Peening, and Laser Peening by Observation of Crack Initiation and Crack Growth in Stainless Steel
title_full Comparison between Shot Peening, Cavitation Peening, and Laser Peening by Observation of Crack Initiation and Crack Growth in Stainless Steel
title_fullStr Comparison between Shot Peening, Cavitation Peening, and Laser Peening by Observation of Crack Initiation and Crack Growth in Stainless Steel
title_full_unstemmed Comparison between Shot Peening, Cavitation Peening, and Laser Peening by Observation of Crack Initiation and Crack Growth in Stainless Steel
title_sort comparison between shot peening, cavitation peening, and laser peening by observation of crack initiation and crack growth in stainless steel
publisher MDPI AG
series Metals
issn 2075-4701
publishDate 2019-12-01
description The traditional technique used to modify the surface of a metallic material is shot peening; however, cavitation peening, a more recent technique in which shot is not used, was developed, and improvements in the fatigue strength of metallic materials were demonstrated. In order to compare the fatigue properties introduced by shot peening with those introduced by cavitation peening, crack initiation and crack growth in specimens of austenitic stainless steel (Japanese Industrial Standards JIS SUS316L) treated using these techniques were investigated. With conventional cavitation peening, cavitation is produced by injecting a high speed water jet into water. In the case of submerged laser peening, bubbles are generated using a pulsed laser after laser ablation, and the impact produced when the bubbles collapse is larger than that due to laser ablation. Thus, in this study, cavitation peening using a water jet and submerged laser peening were investigated. To clarify the mechanisms whereby the fatigue strength is improved by these peening techniques, crack initiation and crack growth in specimens with and without treatment were examined by means of a <i>K</i>-decreasing test, where <i>K</i> is the stress intensity factor, and using a constant applied stress test using a load controlled plane bending fatigue tester. It was found that the improvement in crack initiation and the reduction in crack growth were roughly in a linear relationship, even though the specimens were treated using different peening methods. The results presented here show that the fatigue strength of SUS316L treated by these peening techniques is closely related to the reduction in crack growth, rather than crack initiation.
topic cavitation peening
shot peening
crack
fatigue
stainless steel
url https://www.mdpi.com/2075-4701/10/1/63
work_keys_str_mv AT hitoshisoyama comparisonbetweenshotpeeningcavitationpeeningandlaserpeeningbyobservationofcrackinitiationandcrackgrowthinstainlesssteel
_version_ 1724988625642323968