{"id":8034,"date":"2018-11-24T12:58:57","date_gmt":"2018-11-24T12:58:57","guid":{"rendered":"https:\/\/staging.asminternational.org\/hts-new\/results\/-\/journal_content\/56\/10192\/35867081\/NEWS\/"},"modified":"2023-02-07T04:48:02","modified_gmt":"2023-02-07T04:48:02","slug":"abstract-from-mst-2018-technical-program-effects-of-post-build-thermal-processing-on-the-microstructure-of-laser-powder-bed-produced-17-4-ph-stainless-steel","status":"publish","type":"post","link":"https:\/\/www.asminternational.org\/hts\/abstract-from-mst-2018-technical-program-effects-of-post-build-thermal-processing-on-the-microstructure-of-laser-powder-bed-produced-17-4-ph-stainless-steel\/","title":{"rendered":"Abstract from MS&amp;T 2018 technical program: Effects of Post-Build Thermal Processing on the Microstructure of Laser Powder-Bed Produced 17-4 PH Stainless Steel"},"content":{"rendered":"<p style=\"margin-bottom:.0001pt\"><span style=\"line-height:normal\"><span style=\"font-size:12.0pt\"><span style=\"color:black\">17-4 PH is a martensitic stainless steel of interest for additive manufacturing (AM) applications because of its combination of high strength and corrosion resistance. <\/span><\/span><span style=\"font-size:12.0pt\"><span style=\"color:black\">In the wrought form this steel has a fully martensitic structure that can be strengthened by precipitation of fine Cu-rich FCC precipitates upon aging. <\/span><\/span><span style=\"font-size:12.0pt\"><span style=\"color:black\">When produced via AM, its microstructure depends strongly on the powder feedstock, particularly the gas used during powder atomization, typically argon or nitrogen. Argon-atomized powder costs significantly more than that produced with nitrogen.<\/span><\/span><\/span><\/p>\n<p style=\"margin-bottom:.0001pt\"><span style=\"line-height:normal\"><span style=\"font-size:12.0pt\"><span style=\"color:black\">However, nitrogen is a strong austenite stabilizer in iron and steel, resulting in an as-built microstructure of AM 17-4 PH that contains up to 90% retained austenite. <\/span><\/span><\/span><\/p>\n<p style=\"margin-bottom:.0001pt\"><span style=\"line-height:normal\"><span style=\"font-size:12.0pt\"><span style=\"color:black\">Conventional annealing heat treatments reduce the retained austenite to around 10% to 15%, even after cryogenic treatment, resulting in mechanical behavior that differs significantly compared to cast\/wrought 17-4 PH. <\/span><\/span><\/span><\/p>\n<p style=\"margin-bottom:.0001pt\"><span style=\"line-height:normal\"><span style=\"font-size:12.0pt\"><span style=\"color:black\">This work examines alternative post-build processing of nitrogen gas-atomized AM 17-4 PH to minimize or eliminate the retained austenite in the final microstructure, producing a material that more closely resembles its cast\/wrought counterpart.<\/span><\/span><\/span><\/p>\n<p class=\"search-info\"><i><span style=\"color:black\">Eric Lass,<\/span><\/i><span style=\"color:black\"> Carelyn Campbell<\/span><sup style=\"font-variant-ligatures:normal; font-variant-caps:normal; orphans:2; text-align:start; widows:2; -webkit-text-stroke-width:0px; text-decoration-style:initial; text-decoration-color:initial; word-spacing:0px\">,<\/sup> Maureen Williams, National Institute of Standards &amp; Technology (NIST)<\/p>\n<p class=\"search-info\" style=\"margin:0in; margin-bottom:.0001pt\"><span style=\"color:black\"><a href=\"http:\/\/www.nist.gov\">www.nist.gov<\/a><\/span><br \/>\n&nbsp;<\/p>\n<p class=\"search-info\" style=\"margin:0in; margin-bottom:.0001pt\"><span style=\"font-size:16px;\"><span style=\"font-variant-ligatures:normal; text-align:start; -webkit-text-stroke-width:0px\"><span style=\"font-variant-caps:normal\"><span style=\"orphans:2\"><span style=\"widows:2\"><span style=\"text-decoration-style:initial\"><span style=\"text-decoration-color:initial\"><span style=\"float:none\"><span style=\"word-spacing:0px\"><span lang=\"EN\"><span style=\"color:#006621\">https:\/\/www.nist.gov\/people\/eric-lass <\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<p style=\"margin-bottom:.0001pt\"><span style=\"line-height:normal\"><span style=\"font-variant-ligatures:normal; text-align:start; -webkit-text-stroke-width:0px\">&nbsp;<\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>17-4 PH is a martensitic stainless steel of interest for additive manufacturing (AM) applications because of its combination of high strength and corrosion resistance.<\/p>\n","protected":false},"author":63082,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[444,446,440,441,1],"tags":[],"class_list":["post-8034","post","type-post","status-publish","format-standard","hentry","category-aerospace-and-defense","category-automobiles-and-ground-transportation","category-news","category-news-articles","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - 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