Microstructure estimation and validation of ER110S-G steel structures produced by wire and arc additive manufacturing

Wire and Arc Additive Manufacturing (WAAM) emerged as a manufacturing process for large scale structures with extensive form design freedom. WAAM can be fully exploited once the relation between transient thermal history its to microstructure development resultant mechanical properties is established. This further used computational tools such Topology Optimization. paper presents model predict solid-state phase transformations in widely applicable High Strength Low Alloy steel ER110S-G. The of parts manufactured by modelled using finite element analysis. validated thermocouple measurements. Our results show that critical cooling cycle responsible transformation an AM part. rate this particular superimposed onto experimentally constructed Continuous Cooling Transformation (CCT) diagram determine local fractions. predicted fractions three wall samples different processing conditions are hardness. hardness 10% higher than measured samples. effect tempering also considered through JMAK equation. caused regions high martensite content it lowers 8 − 10%. micrographs microstructural features same similar rates.