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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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低合金超高强度钢亚结构超细化对韧性的影响
, PP. 292-296
Keywords: 超高强度钢,铁素体,残余奥氏体,切变单元,冲击吸收功,胞状亚结构
Abstract:
充分利用控制相变温度、冷却与回火参数,得到冲击吸收功(AKV)成倍提高的系列Si,Mn等元素合金化的低合金超高强度结构钢(LUHSSS).TEM,SEM和AFM分析表明LUHSSS由纳米尺度的铁素体(F)板条与分布在其间的、高度稳定的膜状残余奥氏体(AR)组成,无块状不稳定AR和渗碳体析出;由若干切变单元组成的F板条不连续分布,厚度范围75---100nm.回火过程中,板条内位错运动形成纳米尺寸(1400MPa)前提下,AKV大幅度提高至200J附近.分析了胞状亚结构对LUHSSS韧性的影响机制.
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