In situ control of tempered martensite during laser cladding repair of aero-grade 300M steel using AISI 420 stainless steel powder
Source abstract
Abstract
The aim of this paper was to investigate the effect of delay time between the clad tracks on the microstructure hardness evolution. AISI 420 stainless steel was deposited onto 300M steel substrate using a fiber delivered disk laser and a powder blown coaxial nozzle. The delay between the clad tracks was aimed at controlling the in situ quench and tempering sequence during the cladding process. Four different delay times were investigated (continuous build, t = 2 s, t = 5 s, and t = 60 s). No micro-cracking and very little porosity were observed for all variables. The microstructure changed from untempered martensite structure at a continuous build to a fully tempered martensite structure at t = 60 s. The delay time between the clad tracks is the most influential parameter to control the in situ tempering and is crucial to restore the tensile and fatigue properties of aero-grade high strength steel for repair applications.
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Research context
OpenAlex topics: High Entropy Alloys Studies · Additive Manufacturing Materials and Processes · Welding Techniques and Residual Stresses
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
RMIT Centre for Additive Manufacturing, School of Engineering, RMIT University 1 , Carlton, Victoria 3083, Australia
Defence Materials Technology Centre (DMTC) 2 , Hawthorn, Victoria 3122, Australia
References (17)
Show source-provided references
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