共析钢是指具有共析成分含0.77%碳的碳素钢。钢由高温奥氏体区缓冷至727℃,生成多边形珠光体组织,其中铁素体和渗碳体呈片状平行排列。优质碳素结构钢和碳素工具钢都包含有这种组织。一般冷却速度大,珠光体片层间距减小,有利于强度和硬度提高。
共析钢(eutectoid steel):Wc=0.77% 过共析钢(hypereutectoid steel):Wc=0.77~2.11% 含碳量在0.7%以上的共析钢和过共析钢,属于高碳钢,属工具钢类。
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Eutectoid steel is one kind of natural composite materials. The basic structure is made up of soft ferrite and hard cementite lamellar.
共析钢是天然的复合材料,其基体珠光体组织由较软的铁素体和较硬的渗碳体层片相间排列而成。
参考来源 - 共析钢室温冷拔变形机制研究·2,447,543篇论文数据,部分数据来源于NoteExpress
过共析钢是含碳量大于共析量的钢。
Hypereutectoid steels are steels that contain greater than the eutectoid amount of carbon.
此处理方法对必须机加工的过共析钢特别有用。
This treatment is particularly useful for hypereutectoid steels that must be machined.
含碳量少于共析体(低于0.77%)的钢称为亚共析钢。
Steels having less than the eutectoid amount of carbon (less than 0.77%) are known as hypo-eutectoid steels.
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