Regensburg 2022 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 11: Crystal Structure Defects / Real Structure / Microstructure

KFM 11.1: Vortrag

Dienstag, 6. September 2022, 09:30–09:50, H7

HRTEM study of nanoparticle precipitation in additively manufactured 1.2709 maraging steel — •Anna Benediktová¹, Dagmar Jandová¹, Jiří Benedikt², Rostislav Medlín¹, and Ján Minár¹ — ¹New Technologies - Research Center, University of West Bohemia, Pilsen, Czech Republic — ²Faculty of Applied Sciences, University of West Bohemia, Pilsen, Czech Republic

Maraging steels are known for their excellent properties, such as high strength and toughness, which are mainly due to the precipitation of intermetallic compounds during heat treatment. Up to now, mainly precipitation hardening from a temperature of about 500 °C has been studied, however, the hardening effect begins to show clearly at lower temperatures, even from 250 °C.

The HRTEM study was performed on maraging steel samples without tempering as well as after tempering at 350 °C and 490 °C, and the results were compared with simulations. Besides other relatively coarse precipitates, a high density of globular coherent nanoparticles with a superlattice was found in samples tempered at 350 °C. While the sample tempered at 490 °C contained slightly larger globular and rod-shaped Ni3Mo particles.