Hardening Effects of In-Situ Aging for a Laser Welded Maraging Steel

Abstract

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Mechanical and Microstructural Characterization of Plasma Welded Joints of 18 Ni-300 Maraging Steels Subjected to Repairs

“…It is also noted in FZ some points with a drop in hardness, this fact is associated with the dendritic structure and the formation of untransformed austenite due to the increase of solute atoms in the last liquid portions to solidify, or reversed, due to reheating, a phenomenon also observed by some other authors (Reis et al, 2015;Sakai et al, 2016;de Lima et al, 2019).…”

“…In regions where the temperature reaches values close to 500°C there is the precipitation of intermetallic, with a localized increase in the hardness value (Reis et al, 2016). Due to all these phenomena, it is essential to analyze in detail the microstructure and the influence of the thermal cycles of each repair used (Reis et al, 2015;Sakai et al, 2016;de Lima et al, 2019). Marcisz et al (2017) studied the influence of temperature and aging time on the mechanical properties of Maraging 18Ni 350 steel, this same aging will also occur due to the thermal cycling of the welding process or welding repairs.…”

A Comparative Study of Abbreviated Heat Treatments for SAE 4130 Steel After Laser Welding

“…Of course, the calculations considers a homogeneous parent phase (austenite) which could be inaccurate for as as-solidified weld bead. Nevertheless, as reported before 12 , the micro-segregation in between dendrite branches could be unsolubilized during the heat treatments.…”

“…Lima et al 12 introduced the same concept for in-situ tempered laser welds for a 18%Ni Maraging 300 steel. One problem raised by these authors is the chemical heterogeneities in FZ due to dendritic micro-segregation, which could not be solved itself by the inductive heating at 570 °C.…”