【摘要】 研究了不同Ｃｕ含量的超低碳钢的组织、性能及时效过程，发现在时效过程中，存在有三种类型的析出物造成时效硬化，它们分别为ε－Ｃｕ析出强化，Ｎｂ的碳氮化物以及含Ｃｒ的碳化物强化其中细小的、在位错上形核的ε－Ｃｕ沉淀析出是造成时效硬化效应的主要原因，得出时效激活能为８７．６ ｋＪ／ｍｏｌ．实验结果表明，在相同的时效温度下，随着Ｃｕ含量增加，ε－Ｃｕ时效硬化峰出现的时间缩短，而Ｎｂ的碳氨化物时效硬化峰位基本不变，因此在高Ｃｕ钢中两峰位置分开，而在低Ｃｕ钢中这两个硬化峰重叠。更多还原

【Abstract】 The microstructure, properties and aging hardening response of ultra-low carbon steels containing various Cu contents have been investigated. Three kinds of precipitates (ε-Cu, Nb carbonitride and Cr carbide) during aging response have been observed. The age hardening is primarily attributed to the fine ε-Cu nucleating at dislocations, of which the activity energy was deduced to be 87.6 kJ/mol.The result indicated that the time sterling the hardening peak from ε-Cu precipitates decreases with an increase in the copper content. In high copper steel there are two hardening peaks attributed to ε-Cu and Nb carbonitride respectively and in low copper steels there is only one peak.更多还原