Ni对厚大断面球铁显微组织和力学性能的影响  

Effect of Ni on microstructure and mechanical properties of heavy section ductile cast iron

作　　者：于明基 王丽萍[1,2] 冯义成[1,2] 陈亮[1] 付原科 王长亮 YU Ming-ji;WANG Li-ping;FENG Yi-cheng;CHEN Liang;FU Yuan-ke;WANG Chang-liang(School of Materials Science and Engineering,Harbin University of Science and Technology,Harbin 150040,China;Key Laboratory of Advanced Manufacturing and Intelligent Technology,Ministry of Education,Harbin 150080,China)

机构地区：[1]哈尔滨理工大学材料科学与工程学院,黑龙江哈尔滨150040 [2]先进制造智能化技术教育部重点实验室,黑龙江哈尔滨150080

出　　处：《材料热处理学报》2020年第4期116-124,共9页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51674094)。

摘　　要：以不含Ni和含Ni的厚大断面球墨铸铁为研究对象,并对其进行低温两阶段退火处理(760℃+4 h和730℃+4 h)。采用光学显微镜、扫描电镜、电子万能试验机和布氏硬度计等研究了厚大断面球铁试样不同部位的显微组织和力学性能。结果表明:退火处理后,试样的铁素体含量达到了95%以上。随着凝固时间的增加,从试样表面到心部位置,出现了畸形石墨,导致力学性能急剧下降。与未加Ni相比,含0.6%Ni试样的石墨球细小圆整,基体组织得到细化,力学性能明显提高。The heavy section ductile cast iron without Ni and Ni was used as the research object, and it was subjected to low temperature two-stage annealing treatment(760 ℃×4 h and 730 ℃×4 h). Microstructure and mechanical properties of different positions of the heavy section ductile cast iron samples were studied by means of optical microscope, scanning electron microscopy, electronic universal testing machine and Brinell hardness tester. The results show that the ferrite content of the sample is more than 95% after annealing. With the increase of solidification time, distorted graphite appears in the sample from the surface to the center, which leads to the sharp decrease of the mechanical properties of the sample. Compared with the sample without Ni, the spheroidal graphite of the sample with 0.6%Ni is fine and round, the matrix structure is refined, and the mechanical properties of the sample are obviously improved.

关 键 词：厚大断面球铁 NI 力学性能 铁素体 

分 类 号：TG143.5[一般工业技术—材料科学与工程]