{"id":10974,"date":"2018-07-17T08:53:48","date_gmt":"2018-07-17T08:53:48","guid":{"rendered":"https:\/\/staging.asminternational.org\/hts-new\/effect-of-annealing-time-and-temperature-on-aged-properties\/"},"modified":"2023-02-23T22:43:00","modified_gmt":"2023-02-23T22:43:00","slug":"effect-of-annealing-time-and-temperature-on-aged-properties","status":"publish","type":"post","link":"https:\/\/www.asminternational.org\/hts\/effect-of-annealing-time-and-temperature-on-aged-properties\/","title":{"rendered":"Effect of Annealing Time and Temperature on Aged Properties"},"content":{"rendered":"<p><span><span><span><span>The graph shows the influence of solution-annealing temperature on the aged tensile properties of consumable vacuum-melted 18Ni Marage 250 steel.&nbsp;<\/span><\/span><\/span><\/span><span><span><span><span>Heat treatment consists of solution annealing for half an hour at the indicated temperatures, air cooling, and then aging at 480 \u00b0C (900 \u00b0F) for three hours. <\/span><\/span><\/span><\/span><\/p>\n<p><span><span><span>The solution-annealing temperature has only a small effect on the strength of the aged material. This behavior is graphically depicted in the graph. The data show that peak strength occurs with an 800 to 815\u00b0C (1475 to 1500\u00b0F) solution anneal, and strength is reduced up to 135 MPa (20 ksi) with higher and lower temperatures in the 760 to 980\u00b0C (1400 to 1800\u00b0F) range. Tensile ductility increases slightly with annealing temperatures from 760 to 815\u00b0C (1400 to 1500\u00b0F) and remains relatively unchanged with temperatures up to 980\u00b0C (1800\u00b0F). <\/span><\/span><\/span><\/p>\n<p><span><span><span>Lower strength and ductility with solution-annealing temperatures from 760 to 800 \u00b0C (1400 to 1475 \u00b0F) are attributed to incomplete solution of hardening elements. The reduction in strength associated with solution-annealing temperatures above 815 \u00b0C (1500 \u00b0F) is attributed to coarsening of the grain\/packet structure. This grain growth and the subsequent reduction in strength are minimized by boron contents between 0.001 and 0.003%.<\/span><\/span><\/span><\/p>\n<p><span><span><span>Maraging steels are usually solution annealed at a given temperature for one hour. &nbsp;There could be a benefit to strength from shorter solution-annealing times; however, care must be taken to ensure complete solution of hardening elements. Therefore, one hour solution-annealing times are generally favored, and excessively long times are discouraged. Even boron-containing maraging steels will exhibit grain growth if exposed for more than 6 h at 955 \u00b0C (1750 \u00b0F).<\/span><\/span><\/span><\/p>\n<p><a href=\"https:\/\/matdata-s.asminternational.org\/hbk\/do\/section\/content\/V04D\/D00\/A01\/index.htm\"><span><span><span><span><span><span>Volume 4D, Heat Treating of Irons and Steels<\/span><\/span><\/span><\/span><\/span><\/span><\/a><span><span><span><span> -&gt; Heat Treated High-Alloy Steels -&gt;<\/span><\/span><\/span><\/span><a href=\"https:\/\/matdata-s.asminternational.org\/hbk\/do\/section\/content\/V04D\/D04\/A09\/index.htm\"><span><span><span><span><span><span>Heat Treating of Maraging Steels<\/span><\/span><\/span><\/span><\/span><\/span><\/a><span><span><span><span> -&gt; Martensite Aging<\/span><\/span><\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The graph shows the influence of solution-annealing temperature on the aged tensile properties of consumable vacuum-melted 18Ni Marage 250 steel.<\/p>\n","protected":false},"author":63103,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[440,441,1],"tags":[],"class_list":["post-10974","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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