{"id":8399,"date":"2019-05-09T10:18:41","date_gmt":"2019-05-09T10:18:41","guid":{"rendered":"https:\/\/staging.asminternational.org\/hts-new\/results\/-\/journal_content\/56\/10192\/37224035\/NEWS\/"},"modified":"2023-02-07T04:48:47","modified_gmt":"2023-02-07T04:48:47","slug":"one-minute-mentor-ductile-iron-austempering-temperature-and-time","status":"publish","type":"post","link":"https:\/\/www.asminternational.org\/hts\/one-minute-mentor-ductile-iron-austempering-temperature-and-time\/","title":{"rendered":"One Minute Mentor: Ductile iron austempering temperature and time"},"content":{"rendered":"<p style=\"margin-bottom:.0001pt\"><span style=\"line-height:normal\"><span style=\"vertical-align:baseline\"><span style=\"font-size:12.0pt\"><span style=\"color:black\">The austempering temperature is the primary determinant of the final microstructure and therefore the hardness and strength of the austempered ductile iron product. As the austempering temperature increases, the strength varies, as shown in Fig. 19 for irons with two levels of manganese. <\/span><\/span><\/span><\/span><\/p>\n<p style=\"margin-bottom:.0001pt\">&nbsp;<\/p>\n<p style=\"margin-bottom:.0001pt\"><span style=\"line-height:normal\"><span style=\"vertical-align:baseline\"><span style=\"font-size:12.0pt\"><span style=\"color:black\">The attainment of maximum ductility at any given austempering temperature is a sensitive function of time. The initial increase in elongation occurs as stage I, and elongation progresses to completion, at which point the fraction of austenite is a maximum. <\/span><\/span><\/span><\/span><\/p>\n<p style=\"margin-bottom:.0001pt\">&nbsp;<\/p>\n<p style=\"margin-bottom:.0001pt\"><span style=\"line-height:normal\"><span style=\"vertical-align:baseline\"><span style=\"font-size:12.0pt\"><span style=\"color:black\">Further austempering merely serves to reduce ductility, as the stage II reaction causes decomposition to the equilibrium bainite product. Typical austempering times vary from one to four hours. <\/span><\/span><\/span><\/span><\/p>\n<p style=\"margin-bottom:.0001pt\">&nbsp;<\/p>\n<p style=\"margin-bottom:.0001pt\"><span style=\"line-height:normal\"><span style=\"vertical-align:baseline\"><span style=\"font-size:12.0pt\"><span style=\"color:black\">Adapted from: K. Hayrynen, Heat Treating and Properties of Ductile Iron, <em>Heat Treating of Irons and Steels<\/em>,&nbsp;Vol 4D,<em> ASM Handbook<\/em>,&nbsp;ASM International, 2014, p 508\u2013521. <a href=\"https:\/\/doi.org\/10.31399\/asm.hb.v04d.a0005937\">https:\/\/doi.org\/10.31399\/asm.hb.v04d.a0005937 <\/a><\/span><\/span><\/span><\/span><\/p>\n<p style=\"margin-bottom:.0001pt\">&nbsp;<\/p>\n<p style=\"margin-bottom:.0001pt\"><span style=\"line-height:normal\"><span style=\"vertical-align:baseline\"><span style=\"font-size:12.0pt\"><span style=\"color:black\">For more information on this topic, visit the article (subscription required), scroll down the Chapter Contents column on the left, and click on <strong>Austempering Ductile Iron.<\/strong><\/span><\/span><\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The austempering temperature is the primary determinant of the final microstructure and therefore the hardness and strength of the austempered ductile iron product.<\/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":[440,441,1],"tags":[],"class_list":["post-8399","post","type-post","status-publish","format-standard","hentry","category-news","category-news-articles","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - 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