Study on microstructure and tensile properties of high nitrogen Cr-Mn steel processed by CMT wire and arc additive manufacturing

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dc.contributor.authorZhang, Xiaoyong
dc.contributor.authorZhou, Qi
dc.contributor.authorWang, Kehong
dc.contributor.authorPeng, Yong
dc.contributor.authorDing, Jialuo
dc.contributor.authorKong, Jian
dc.contributor.authorWilliams, Stewart W.
dc.date.accessioned2020-01-22T12:34:12Z
dc.date.available2020-01-22T12:34:12Z
dc.date.issued2019-01-23
dc.description.abstractA designed Cr-Mn-N wire with 0.99 wt% of nitrogen content (HNS0.99) was used to make high nitrogen austenite stainless steel parts by introducing CMT wire and arc additive manufacturing (CMT-WAAM) method. The solidification behaviour, microstructure evolution, inclusions and tension properties were studied both in the as-built and post heat treatment conditions. Excellent tension properties parts with high nitrogen content were successfully produced. Ferrite-austenite (FA) and austenite-ferrite (AF) solidification models were revealed in the as-built microstructure of two different areas, inner layer area (ILA) and partial melting area (PMA), respectively, and the former predominated the microstructure. Amorphous inclusion islands and microspherical inclusions made by MnO were found. The increasing density of the latter in 0.1-1 μm diameters was detrimental to the tensile properties because the matrix-inclusion surfaces acted as the preferred nucleation sites for Cr2N during heat treatment. Due to the stable austenite and the nitrogen work hardening effect, planer dislocation-arrays predominated the dislocation slip model which, to some extent, diminished the strength anisotropy in different directions. However, the ferrite dendrites caused the diversity of UTS and elongation by acting as tunnels for cracks in the horizontal direction samples.en_UK
dc.identifier.citationZhang X, Zhou Q, Wang K, et al., (2019) Study on microstructure and tensile properties of high nitrogen Cr-Mn steel processed by CMT wire and arc additive manufacturing. Materials and Design, Volume 166, March 2019, Article number 107611en_UK
dc.identifier.issn0264-1275
dc.identifier.urihttps://doi.org/10.1016/j.matdes.2019.107611
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/14989
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectHigh nitrogen Cr-Mn steelen_UK
dc.subjectCMT wire and arc additive manufacturing (CMT-WAAM)en_UK
dc.subjectPost heat treatmenten_UK
dc.subjectSolidification modelen_UK
dc.subjectNitrogen work hardeningen_UK
dc.subjectInclusionsen_UK
dc.titleStudy on microstructure and tensile properties of high nitrogen Cr-Mn steel processed by CMT wire and arc additive manufacturingen_UK
dc.typeArticleen_UK

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