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Wikipedia definition
1. Work hardeningWork hardening, also known as strain hardening or cold working, is the strengthening of a metal by plastic deformation. This strengthening occurs because of dislocation movements within the crystal structure of the material. Most non-brittle metals with a reasonably high melting point as well as several polymers can be strengthened in this fashion. Alloys not amenable to heat treatment, including low-carbon steel, are often work-hardened.
Read “Work hardening” on English Wikipedia
Read “加工硬化” on Japanese Wikipedia
Read “Work hardening” on DBpedia

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