23Co13Ni11Cr3Mo钢高温变形奥氏体晶粒的演化规律  

Austenitic grain evolution of 23Co13Ni11Cr3Mo ultrahigh strength steel during high temperature deformation

作　　者：黄始全[1] 易幼平[1] 李蓬川[2] 

机构地区：[1]中南大学机电工程学院,湖南长沙410083 [2]中国第二重型机械集团公司,四川德阳618000

出　　处：《材料热处理学报》2013年第3期99-103,共5页Transactions of Materials and Heat Treatment

基　　金：国家'973'计划资助项目(2011CB706802);国家重大专项资助项目(2009ZX04005-011)

摘　　要：在Gleeble 1500热模拟机上对23Co13Ni11Cr3Mo超高强钢进行了大变形等温压缩实验,研究了变形温度、应变速率对奥氏体晶粒尺寸的影响。结果表明:奥氏体晶粒尺寸对数与变形温度倒数、应变速率对数和Z参数对数呈线性关系,降低温度、提高应变速率、增大Z参数,有利于细化晶粒,改善晶粒组织均匀性。根据实验结果得出了23Co13Ni11Cr3Mo钢锻造温度和应变速率范围,建立了奥氏体晶粒尺寸模型,模型预测值与实验值吻合较好。High-strain isothermal compression tests of 23Co13NillCr3Mo ultrahigh strength steel were carried out on a Gleeble 1500 simulator. Influences of deformation temperature and strain rate on austenitic grain size were examined. The results show that austenitic grain size of the steel has a linear relationship with the reciprocal of deformation temperature （ T-~ ） in the semi-logarithmic coordinate, and it has a linear relationship with strain rate and Z parameter in natural logarithmic coordinate. Small size and uniform distribution of grains are obtained for the steel deformed at lower temperature, higher strain rate and higher Z parameter. The ranges of deformation temperature and strain rate of 23Co13Nil 1 Cr3Mo ultrahigh strength steel are optimized based on the experiments and austenitic grain size model is established for forging process. The predicted values of the model agree well with those of experiment.

关 键 词：超高强钢 23Co13Ni11Cr3Mo 动态再结晶 晶粒尺寸 奥氏体 

分 类 号：TG142[一般工业技术—材料科学与工程]