Microstructure and properties of SLM formed high thermal conductivity injection mould steel and after heat treatment

doi:10.13251/j.issn.0254-6051.2024.10.027

Abstract

Abstract: Microstructure and properties of SLM formed specimen and after heat treatment of a new high thermal conductivity injection mould steel 1CrMoVNb were analyzed by means of optical microscope, X-ray diffractometer (XRD), scanning electron microscope (SEM). The results show that the SLM formed specimen is well lapped, with mainly cellular crystals in the cross-section and columnar crystals in the longitudinal section, and the microstructure is mainly ferrite. After quenching at 1250 ℃ for 60 min, WQ and tempering at 600 ℃ for 120 min, AC, the lap line dissolves, the microstructure is more uniform and mostly transforms to tempered martensite. The mechanical properties of the SLM formed specimen are anisotropic, the hardness in transverse section is greater than that in longitudinal section, the transverse tensile strength and yield strength is better than the longitudinal, while the transverse elongation is lower than the longitudinal. After heat treatment, the mechanical properties and thermal conductivity of the specimen are greatly improved, and the anisotropy is improved, which can well meet the requirements of injection mold steel.

Key words: SLM, high thermal conductivity, injection mould steel, microstructure, properties

CLC Number:

TF124

Chen Yahui, Yang Haibo, Zhang Miao. Microstructure and properties of SLM formed high thermal conductivity injection mould steel and after heat treatment[J]. Heat Treatment of Metals, 2024, 49(10): 162-168.

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