挤压铸件不同部位和壁厚的组织及溶质分布  

Microstructure of Squeeze Castings at Different Position with Wall Thickness and Solute Distribution

作　　者：张永冰 吉泽升[1] 汪胜 胡茂良[1] 姜博 宋伟生 Zhang Yongbing;Ji Zesheng;Wang Sheng;Hu Maoliang;Jiang Bo;Song Weisheng(School of Material Science and Engineering,Harbin University of Science and Technology;Harbin Jixing Mechanical Engineering Co.,Ltd.)

机构地区：[1]哈尔滨理工大学材料科学与工程学院,哈尔滨150040 [2]哈尔滨吉星机械工程有限公司

出　　处：《特种铸造及有色合金》2021年第6期755-759,共5页Special Casting & Nonferrous Alloys

基　　金：国家重点研发计划资助项目(2019YFB2006500)。

摘　　要：研究了挤压铸造零件不同部位的微观组织和Cu含量,并讨论了壁厚对试样微观组织和Cu含量的影响,利用光学显微镜和直读光谱仪,观察和测量了零件各部位微观组织变化和溶质含量变化。结果表明,随着试样距内浇口距离(158、201、245、284 mm)依次增大,试样的晶粒变得粗大,晶粒尺寸由18.35μm变为39.85μm。Cu含量由表面的1.73%~1.77%增加到心部的1.81%~1.87%,硬度(HV)由表面的102.5~106减小到心部的96~99;壁厚越大(6、17、27.5 mm),心部的硬度(HV)越小,最小值为96,晶粒变得粗大,尺寸为45.22μm,心部Cu含量增加;从试样表面至心部,Cu含量呈增加趋势,由表面的1.73%~1.75%变为心部的1.83%~1.85%,硬度呈减小趋势。The microstructure and Cu content of the squeezing casting components in different positions and the influence of wall thickness on the microstructure of the specimen and Cu content was analyzed by optical microscope and spectrometer to observe and measure microstructure and solute content changes in the various parts.The results reveal that the grain size becomes coarse with the increase of distance of ingate distance(158,201,245 and 284 mm)which is changed from 18.35μm to 39.85μm.The content of Cu is increased from 1.73%~1.77%in the surface to 1.81%~1.87%at the center,and the hardness(HV)is decreased from 102.5~106 at the surface into 96~99 at the center.With increasing in wall thickness(6,17,27.5 mm),the central hardness value is decreased to 96 HV,and the grains become coarse to 45.22μm accompanied with the increasing Cu content.From the surface to the center,the copper content is increased by 1.73%~1.75 to 1.83%~1.85%,and the hardness is decreased.

关 键 词：挤压铸造 不同部位 壁厚 CU含量 硬度 

分 类 号：TG249.2[金属学及工艺—铸造] TG146.21[一般工业技术—材料科学与工程]