含铜高纯低碳钢时效过程中微观组织的观察  

Microstructure observation of high purity low-carbon steel containing copper during isothermal aging

作　　者：安治国[1] 刘宗昌[1] 王海燕[1] 任慧平[1] 

机构地区：[1]内蒙古科技大学材料科学与工程学院,内蒙古包头041010

出　　处：《兵器材料科学与工程》2006年第2期35-38,共4页Ordnance Material Science and Engineering

基　　金：国家自然科学基金资助项目(50361001)

摘　　要：含铜高纯低碳钢时效后具有较高的强度和韧性。为了研究含铜高纯钢时效过程中微观组织的变化,测定了试样时效处理后的维氏硬度,并利用扫描电子显微镜(Quanta400)研究了含铜高纯钢时效过程中的微观组织,分析了时效工艺与硬度、微观组织之间的对应关系。结果表明,试验钢在650℃时效103s时出现硬化峰。在时效过程中,富铜析出物优先在铁素体晶界处析出。随着时效时间的延长,试样处于过时效时,富铜析出物不断粗化长大,导致硬度的下降。High purity low-carbon steel containing copper has excellent performance, such as high strength and high toughness after aging. In order to study microstructure transformation of experimental steel, its hardness was characterized by Vikers microhardness measurement and the microstructure during aging treatment was observed by means of SEM（Quanta 400）. The relationships between aging process and hardness and microstructure were analyzed in this paper. The result shows that the hardness reaches peak value when aging at 650 ℃ for 103 s. Rich-copper particles are precipitated in the ferrite grain boundary during aging treatment. Moreover, rich-copper particles coarsen with holding time increasing, which results in hardness decreasing.

关 键 词：含铜高纯钢 固溶 显微组织:时效硬化 

分 类 号：TG115.213[金属学及工艺—物理冶金]