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overheated structure
met.
过热组织
(【技】由于加热温度过高,金属或合金的晶粒过分长大,超过了技术标准所规定的晶粒尺寸,以致基体晶粒变得明显粗大的组织。具有粗晶粒的钢的冲击韧性很低,是一种组织缺陷,在生产中应尽量避免。碳钢和中低合金钢发生过热后,可通过再次热处理使之发生重结晶细化晶粒。但对于高合金钢,因为没有晶型转变,无法通过重结晶来改正粗晶,只能通过形变再结晶加以改正。)
tech.
焊接部分的
过热结构
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