高碳钢丝及制品的塑性加工工艺与组织性能分析.docx

西安建筑科技大学硕士学位论文 Y 616986
高碳钢丝及制品的塑性加工工艺与组织性能研究
专业::刘波导师:王伯健副教授
摘 要
本文研究了SWRH57B、SWRH72B和SWRH82B高碳钢盘条的拉拔及球化退火工艺,分析了盘条拉拔过程中珠光体组织的变化规律和低温退火过程中渗碳体球化机理,讨论了化学成分、变形量、加热温度及保温时间对球化过程的影响。实验结果表明,高碳钢丝在拉拔过程中,薄片状渗碳体可以通过延伸、弯曲或折叠的变形方式来协调变形,同时提高材料的强度;采用无氧化罩式退火炉对钢丝进行球化退火,三种钢丝均可获得良好粒状珠光体组织。在本实验条件下,细小、圆形的渗碳体均匀的分布在铁索体等轴晶粒的晶界处,球状渗碳体颗粒大小约为l u m,铁素体的平均晶粒大小约为3 IJ,m;钢丝球化退火后表面光亮,无新增氧化脱碳现象; 并具有良好的通条力学性能。
研究了钢丝轧扁工艺,分析了圆钢丝轧制扁钢丝变形规律和特点,拟合了圆钢
丝轧制扁钢丝的宽展经验公式为AB=(~)等√丑△^,并应用于轧制不Ah一
爿
同规格高精度扁钢带实际生产中。本文对高碳钢丝制品金属针布的组织性能进行了分析,实验结果表明:采用
SWRH72B钢丝制备的金属针布齿尖金相组织为隐针状马氏体+少量未溶碳化物,未溶碳化物量小于3%;齿尖淬硬层显微组织为1级,齿尖显微硬度为765HV,其基部组织为粒状珠光体,基部显微硬度为205HV;采用70NbV钢丝制备金属针布齿尖金相组织为细隐针状马氏体+少量未溶碳化物,未溶碳化物含量达到10%左右, 齿尖显微硬度为849HV,基部显微硬度为209HV,组织和性能明显优于SWRH72B 制备的金属针布,与国外先进金属针布组织和性能相当,完全可以代替进口针布。
关键词:钢丝,拉拔,轧制,球化退火,金属针布
The study on plastic deformation technology and microstructure
and mechanical properties of high-carbon wire and it product
Specialty:Material processing engineering
Presented by:Liu Bo
Directed by:associate professor Wang Bojian
Abstract
In this paper,the drawing and spheroidize annealing processes of SWRH57B、 SWRH72B、SWRH82B high-carbon wire rod was deforming mechanism of pearlite and spheroidize annealing mechanism of pearlite at low temperature was deeply effect of position,deforming degree,heating temperature and
holding time on cementite sphericity was results of experimental shown that the cementite lamellae were deformed and thinned to a fibrous shape then the tensile
strength of all the drawn wires increases continuously with increasing the present experimental conditions,by control annealing parameters,good obtain annealing
quality of wire was and unifo咖cementite with spherical appearance
distribute on the crystal boundary of eqniaxed ferrite size of spherical cementite particle is about 1 p m and the size of ferrite grain is about 3 p annealing in non—oxidizing atmosphere cover anne