Aging Behaviour of a 12.2Cr-10Ni-1Mo-1Ti-0.6Al Precipitation-Hardening Stainless Steel Manufactured via Laser Powder Bed Fusion
نویسندگان
چکیده
The combination of precipitation-hardening stainless steels (PH-SS) and laser powder bed fusion (LPBF) enables the manufacturing tools for plastic injection moulding with optimised geometry conformal cooling channels, potential benefits in terms productivity, part quality, tool duration. Moreover, suitability LPBF-manufactured PH-SS as-built (AB) condition to be age-hardened through a direct aging (DA) treatment great heat simplification respect traditional solution annealing (SA). However, experience severe thermal cycles during their service, which can lead over-aging thus shorten life. Therefore, proper stability is required ensure adequate life reliability. aim present work investigate behaviour commercially available (AMPO M789) manufactured by LPBF AB after solution-annealing order evaluate effect on microstructure response, aiming at assessing its feasibility applications. features melt pool borders, oriented martensite grains, cellular solidification sub-structure, was retained over-aging. On other hand, homogeneous isotropic structure quenching, no structure, or grains. results indicate significant difference between solution-annealed quenched specimens peak hardness (in range 580–600 HV), despite considerably different microstructures. Over-aging attributed both coarsening strengthening precipitates martensite-to-austenite reversion (up ~11 vol.%) upon prolonged exposure high temperature. Based results, guidelines aid selection most suitable procedure are proposed.
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ژورنال
عنوان ژورنال: Metals
سال: 2023
ISSN: ['2075-4701']
DOI: https://doi.org/10.3390/met13091552