首页|Correlation of microstructure,mechanical properties,and residual stress of 17-4 PH stainless steel fabricated by laser powder bed fusion

Correlation of microstructure,mechanical properties,and residual stress of 17-4 PH stainless steel fabricated by laser powder bed fusion

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17-4 precipitation hardening(PH)stainless steel is a multi-purpose engineering alloy offering an excel-lent trade-off between strength,toughness,and corrosion properties.It is commonly employed in additive manufacturing via laser powder bed fusion owing to its good weldability.However,there are remaining gaps in the processing-structure-property relationships for AM 17-4 PH that need to be addressed.For instance,discrepancies in literature regarding the as-built microstructure,subsequent development of the matrix phase upon heat treatment,as well as the as-built residual stress should be addressed to enable reproducible printing of 17-4 builds with superior properties.As such,this work applies a comprehensive characterisation and testing approach to 17-4 PH builds fabricated with different processing parameters,both in the as-built state and after standard heat treatments.Tensile properties in as-built samples both along and normal to the build direction were benchmarked against standard wrought samples in the so-lution annealed and quenched condition(CA).When testing along the build direction,higher ductility was observed for samples produced with a higher laser power(energy density)due to the promotion of interlayer cohesion and,hence,reduction of interlayer defects.Following the CA heat treatment,the austenite volume fraction increased to～35％,resulting in a lower yield stress and greater work hard-ening capacity than the as-built specimens due to the transformation induced plasticity effect.Neutron diffraction revealed a slight reduction in the magnitude of residual stress with laser power.A concentric scanning strategy led to a higher magnitude of residual stress than a bidirectional raster pattern.

Additive Manufacturing17-4 PH stainless steelMechanical propertiesResidual stress

M.S.Moyle、N.Haghdadi、V.Luzin、F.Salvemini、X.Z.Liao、S.P.Ringer、S.Primig

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School of Materials Science & Engineering,UNSW Sydney,NSW 2052,Australia

Australian Nuclear Science and Technology Organisation(ANSTO),NSW 2234,Australia

School of Engineering,The University of Newcastle,NSW 2308,Australia

Australian Centre for Microscopy & Microanalysis,The University of Sydney,NSW 2006,Australia

School of Aerospace,Mechanical and Mechatronic Engineering,The University of Sydney,NSW 2006,Australia

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2024

10.1016/j.jmst.2024.01.080

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.198(31)