NDLI: Material Influence on Mitigation of Stress Corrosion Cracking Via Laser Shock Peening

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Brandal, Grant Yao, Y. Lawrence
Copyright Year	2017
Abstract	Stress corrosion cracking is a phenomenon that can lead to sudden failure of metallic components. Here, we use laser shock peening (LSP) as a surface treatment for mitigation of stress corrosion cracking (SCC), and explore how the material differences of 304 stainless steel, 4140 high strength steel, and 260 brass affect their mitigation. Cathodic charging of the samples in 1 M sulfuric acid was performed to accelerate hydrogen uptake. Nontreated stainless steel samples underwent hardness increases of 28%, but LSP treated samples only increased in the range of 0–8%, indicative that LSP keeps hydrogen from permeating into the metal. Similarly for the high strength steel, LSP treating limited the hardness changes from hydrogen to less than 5%. Mechanical U-bends subjected to Mattsson's solution, NaCl, and MgCl2 environments are analyzed, to determine changes in fracture morphology. LSP treating increased the time to failure by 65% for the stainless steel, and by 40% for the high strength steel. LSP treating of the brass showed no improvement in U-bend tests. Surface chemical effects are addressed via Kelvin Probe Force Microscopy, and a finite element model comparing induced stresses is developed. Detection of any deformation induced martensite phases, which may be detrimental, is performed using X-ray diffraction. We find LSP to be beneficial for stainless and high strength steels but does not improve brass's SCC resistance. With our analysis methods, we provide a description accounting for differences between the materials, and subsequently highlight important processing considerations for implementation of the process.
Starting Page	011002
Ending Page	011010
Page Count	9
File Format	PDF
ISSN	10871357
e-ISSN	15288935
Journal	Journal of Manufacturing Science and Engineering
Volume Number	139
Issue Number	1
DOI	10.1115/1.4034283
Language	English
Publisher	The American Society of Mechanical Engineers
Publisher Date	2016-08-08
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Brass (Metal) Dislocations Failure High strength steel Hydrogen Laser hardening Stainless steel Stress Stress corrosion cracking Work function (Physics)
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Mechanical Engineering Computer Science Applications Control and Systems Engineering

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