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Study on T5 treatment for improving dimensional stabilities of aluminum alloy castings
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- KIMURA Kimio
- Mitsubishi Heavy Industries, Ltd.
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- MURAKI Masataka
- Mitsubishi Heavy Industries, Ltd.
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- HAYAKAWA Takao
- Mitsubishi Heavy Industries, Ltd.
Bibliographic Information
- Other Title
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- アルミニウム合金鋳物の寸法安定化のためのT5処理について
- Studies on heat treatments of aluminum alloy castings (1st report)
- アルミニウム合金鋳物の熱処理に関する研究(第1報)
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Description
Heat treatment (T5 treatment) for improving dimensional stabilities was conducted on five sorts of typical aluminum casting alloys; AC2B, AC4B, AC4C, AC5A, and AC8B, <br>Casting stress, growth produced by heating to a high temperature, and mechanical properties were measured on the specimens, which had been heat treated under various T5 conditions, and optimum conditions of T5 treatment were determined<br>The principal results obtained were as follows:<br>1) Aluminum alloys containing appreciable amounts of slicon such as AC2B, AC4B, AC4C, and AC8B exhibited growths of 0.00100.0013mm/mm at maximum when heated to 250°C.<br>However, such a growth was not exhibited by an alloy containing less silicon such as AC5A.<br>For preventing such growths of aluminum alloys containing silicon, it was recommended to perform T5 treatment at 200°C for 10hrs., at 230°C for 3hrs., or at 250°C for 1hr.<br>(2) The casting stesss was increased with the increase in copper content in aluminum alloys.<br>AC5A exhibited the largest casting stress. It was diffcult to relieve its stress by conventional T5 treatments, but the stress was substantially relieved by further T2 treatment at 350°C for 3hrs.<br>Whereas, AC4C exhibited the smallest casting stress. Any T5 treatment was not needed to relieve its stress, or if necessary, the ageing at 250°C for 3hrs. would be enough.<br>3) Some of the methods of heat treatment specified in JIS, MIL, SAE, CSA, etc. are not effective in stress relieving or in preventing growth of castings.<br>You must be careful in application of these specifications to effective heat treatments of aluminum alloy castings.
Journal
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- Journal of Japan Institute of Light Metals
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Journal of Japan Institute of Light Metals 21 (5), 324-336, 1971
The Japan Institute of Light Metals
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Details 詳細情報について
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- CRID
- 1390282681316018560
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- NII Article ID
- 130004207572
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- ISSN
- 18808018
- 04515994
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed