Also found in: Dictionary, Thesaurus, Legal, Financial, Wikipedia.



(metallurgy), a defect that results from heating metals and alloys to high temperatures; the defect is most pronounced when the heating time is extremely long. Steel overheats between 1000° and 1300°C.

After cooling, an overheated metal’s crystal structure is coarse-grained, with distinct, linear boundaries between the components; furthermore, the metal’s resilience is reduced. Overheating can occur during furnace treatments and around seams that have been electrically welded.

In many cases, overheating may be eliminated by a second heating, usually to a temperature 20°-30°C above the recrystallization temperature. This procedure serves to reduce grain size. With alloys of nonferrous metals and with austenitic and ferritic steels, all of which are usually not subjected to recrystallization, overheating cannot be eliminated by repeated thermal treatment; thus, the overheated samples must be rejected as scrap.

The tendency of steels toward overheating depends on their chemical composition and is significantly reduced by adding small amounts of vanadium, titanium, aluminum, or boron.


References in periodicals archive ?
In its Asian Development Outlook 2017 Update released last September 26, the regional lender noted that, instead of a rising inflation, one of the factors that may indicate overheating, inflation had remained within the Bangko Sentral ng Pilipinas's (BSP) target range of 2 percent to 4 percent.
While noting that rapid import growth leading to a widening trade deficit was also a sign of an overheating economy, Capital Economics said that in the Philippines' case, 'there are reasons not to be too worried.
The center has also asked Telecommunications Carriers Association to do more to make consumers aware of the risks and to develop smartphones invulnerable to overheating, the report added.
While these criteria cover both overheating occurrence and severity, they do not account for the length of time for which the hourly temperature continuously exceeds comfort or overheating thresholds.
Overheating is another major cause of tool failure.
Jon has advised people take steps to stay safe on the roads which include, checking tyre pressure, ensuring vehicles have an annual MOT and service and to check coolant and oil levels to prevent overheating.
But overheating concerns have sparked a discussion on Apple's website, with posters saying the new iPadwas noticeably warmer than predecessors.
Additionally, ponds containing used fuel rods have been overheating, and could potentially lead to more contamination.
Global Banking News-January 13, 2011--Central bank of Turkey dispels fears of overheating economy(C)2011 ENPublishing - http://www.
The Fire Service spokesman reminded people about the dangers of overheating extension cables as they make more use of such equipment leads in the run-up to Christmas.
lt;p>Japanese electrical products manufacturer Toshiba Corporation (Tokyo:6502) announced on Thursday a recall of around 41,000 laptop computers because of an overheating problem.
TOKYO: Japan s trade ministry said on Thursday that Apple Inc s Japan unit has satisfied its demands for improved safety notifications about overheating iPod nano portable music players.