摘要
对工业生产的No.1微碳BH钢和No.2微碳BH钢热轧板、冷轧板和退火板的工艺和组织性能进行研究。结果表明,No.1和No.2微碳BH钢的γ织构组分在{111}<110>附近分别达到了最大值12.046和10.549。No.2微碳BH钢退火板平均晶粒尺寸均小于No.1微碳BH钢,细晶强化效果使得其强度略高。No.2微碳BH钢退火板铁素体晶界处和晶粒内均存在游离渗碳体,晶界处珠光体片层较少,No.1微碳BH钢退火板铁素体晶界处存在片层状珠光体和块状渗碳体,更多珠光体片层结构也使其强度较低。No.2微碳BH钢中较高含量P、Cr、Cu元素固溶在基体中引起固溶强化,碳氮化物析出的弥散强化作用,均弥补了C含量较低引起的强度下降。
Effects of hot rolling, cold rolling and continuous annealing processes on microstructure and mechanical properties of two commercial micro-carbon BH steels were studied. The results show that the maximum γfiber texture intensity values of the annealed No. 1 and No. 2 micro-carbon BH steel strips reach 12. 046 and 10. 549 nearby {111}〈110〉, respectively. The average grain size of annealed No. 2 micro-carbon BH steel is lower than that of No. l BH steel. Strength of the No. 2 BH steel is higher than that of the No. 1 BH steel due to the strengthening of the grain refinement. For the annealed No. 2 BH steel, free cementites are observed along ferrite grain boundaries and in ferrite grains, and small amount of lamellar pearlite structure exists along the grain boundaries while for the annealed No. 1 micro-carbon BH steel, lamellar pearlite and bulk cementites are detected along the ferrite grain boundaries, and its lower strength is attributed to the more lamellar pearlitic structure in the No. 1 micro-carbon BH steel. The higher contents of P, Cr, Cu in No. 2 BH steel than in No. l BH steel also contribute to the higher strength due to solid solution strengthening of the elements in matrix and dispersion strengthening of carbonitrides containing theses elements.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第5期70-75,共6页
Transactions of Materials and Heat Treatment
基金
国家"十一五"科技支撑计划项目(2006BAE03A13)
关键词
微碳
烘烤硬化钢
γ纤维织构
组织和性能
micro-carbon
bake hardening steel
γ fiber texture
microstructure and property
