Microstructure and Mechanical Properties of Laser Direct Energy Deposited Martensitic Stainless Steel 410

• DOI: 10.20944/preprints202405.2128.v1
• Publication Date: 2024-06-04T10:14:36Z
• Authors: Hyun-KI KANG; Hyungsoo Lee; Chang-Seok Oh; Jongcheon Yoon
• Keywords: Martensitic stainless steel

The aim of this work is to study the phase transformations, microstructures and mechanical properties martensitic stainless steel (MSS) 410 deposits produced by laser powder-directed energy deposition (LP-DED) additive manufacturing. LP-DED MSS underwent post heat treatment in austenitizing at 980℃ for 3hrs followed different tempering temperatures 250, 600, 750℃ 5hrs, respectively. analyses transformations microstructural evolutions were carried out using X-ray diffraction, SEM-EDS, EBSD. Vickers hardness tensile strength also measured analyze effects treatments. It reveals that as-built has very fine lath martensite high about 480HV1.0 1280 MPa, but elongation was lower than treated ones. Precipitations chromium carbide (Cr23C6) most commonly observed grain boundaries entire matrix 600℃ 750℃. In general, strengths de-creased from 1381MPa 688MPa as increased up 250℃. Additionally, temperature increased, tempered mar-tensite structures became coarser.