{"id":1459,"date":"2016-12-08T08:31:10","date_gmt":"2016-12-08T08:31:10","guid":{"rendered":"https:\/\/www.despatch.com\/blog\/?p=1459"},"modified":"2019-04-10T19:09:45","modified_gmt":"2019-04-10T19:09:45","slug":"delving-popular-heat-treating-methods-specialty-alloys","status":"publish","type":"post","link":"https:\/\/www.despatch.com\/blog\/delving-popular-heat-treating-methods-specialty-alloys\/","title":{"rendered":"Delving Into The Popular Heat Treating Methods of Specialty Alloys"},"content":{"rendered":"

Generally speaking, heat treating is done in order to alter the mechanical properties, the metallurgical structure, or the residual stress state of a metal product.<\/p>\n

As it pertains to aluminum alloys, the term “heat-treatable” is used in order to differentiate those which can be strengthened by heating and cooling versus those which cannot.<\/p>\n

“Non-heat-treatable” alloys depend mostly on cold work to increase strength while other alloys utilize heating to decrease strength and ductility, called annealing.<\/p>\n

Heat treating to increase the strength of aluminum alloys encompasses a three-step process:<\/p>\n

1. Solution Heat Treatment<\/strong>: heating an alloy to a suitable temperature, which it’s held at until one or more constituents enter into a solid solution, upon where it is then cooled rapidly to hold these constituents in solution
\n2. Quenching<\/strong>: development of supersaturation
\n3. Age Hardening<\/strong>: spontaneous hardening of a metal that takes places after it is quenched and then stored at ambient temperature or treated with mild heat<\/p>\n

The following aluminium alloys are commonly used in aircraft and other aerospace structures:<\/p>\n

7068, 7075, 6061, 6063, 2024, 5052, and 7050 aluminum.<\/p>\n

When it comes to stainless steel, Custom 455<\/a>\u00a0can be hardened by cold working and with a heat treatment. However, Custom 455 comes in 4 different specs, AMS 5860, AMS 5672, AMS 5617, and AMS 5578, with all yielding different properties depending on how they are heat treated.<\/p>\n

For example, AMS 5617 wire is\u00a0cold\u00a0drawn or shaved after solution heat treatment, which varies according\u00a0to the spec and alloy shape.<\/p>\n

Depending on chemical composition, fabrication requirements and intended service, nickel and cobalt alloys may be subjected to one or more of five principal types of heat treatment.<\/p>\n

These methods include stress relieving, annealing, stress equalizing, solution treating, and age hardening.<\/p>\n

1. Annealing<\/strong>: generally carried out at temperatures between 705 and 1205\u00b0C in order to produce a recrystallized grain structure and softening in work-hardened alloys.
\n2. Stress Relieving<\/strong>: involves temperatures for nickel and nickel alloys ranging from 425 to 870\u00b0C to remove or reduce stresses
\n3. Stress Equalizing<\/strong>: a low-temperature heat treatment utilized to balance stresses in cold worked material without a significant decrease in the mechanical strength produced by cold working
\n4. Solution Treating<\/strong>: deposits age-hardening constituents and carbides into solid solution byway of a high-temperature treatment
\n5. Age Hardening<\/strong>: conducted at intermediate temperatures (425 to 870\u00b0C) to develop maximum strength by precipitation of a dispersed phase throughout the matrix<\/p>\n

Popular nickel alloys include Incoloy 909, Inconel 718, Inconel 625, and Inconel 601, while MP35N, L-605, and Hayne 188 represent the most prevalent cobalt alloys.<\/p>\n

Nickel and cobalt alloys are known for having great strength and wear-resistant properties at high temperatures. As a result, these alloys are commonly used to replace steel in aircraft jet engines, with the most popular use for the high-temperature cobalt alloy\u00a0being in gas turbine (turbojet) aircraft engines.<\/p>\n

Other common applications for nickel and cobalt alloys include engine plumbing, pumps, valves, piping systems, processing equipment, turbines, assemblies, tools, chemical processing, oil and gas well piping.<\/p>\n","protected":false},"excerpt":{"rendered":"

Generally speaking, heat treating is done in order to alter the mechanical properties, the metallurgical structure, or the residual stress state of a metal product. As it pertains to aluminum alloys, the term “heat-treatable” is used in order to differentiate those which can be strengthened by heating and cooling versus those which cannot. “Non-heat-treatable” alloys […]<\/p>\n","protected":false},"author":1,"featured_media":2839,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[59],"tags":[674,680,675,679,681],"acf":[],"_links":{"self":[{"href":"https:\/\/www.despatch.com\/blog\/wp-json\/wp\/v2\/posts\/1459"}],"collection":[{"href":"https:\/\/www.despatch.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.despatch.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.despatch.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.despatch.com\/blog\/wp-json\/wp\/v2\/comments?post=1459"}],"version-history":[{"count":20,"href":"https:\/\/www.despatch.com\/blog\/wp-json\/wp\/v2\/posts\/1459\/revisions"}],"predecessor-version":[{"id":2865,"href":"https:\/\/www.despatch.com\/blog\/wp-json\/wp\/v2\/posts\/1459\/revisions\/2865"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.despatch.com\/blog\/wp-json\/wp\/v2\/media\/2839"}],"wp:attachment":[{"href":"https:\/\/www.despatch.com\/blog\/wp-json\/wp\/v2\/media?parent=1459"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.despatch.com\/blog\/wp-json\/wp\/v2\/categories?post=1459"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.despatch.com\/blog\/wp-json\/wp\/v2\/tags?post=1459"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}