摘要
基于"随机法"构建了WC-Co硬质合金微观结构的二维参数化模型,使用移动窗口法确定了微观结构代表性体积单元的尺寸,通过有限元模拟拉伸实验计算了材料的弹性性能。该模型考虑了微观结构的拓扑参数,反映了微观结构中平均粒径、长径和短径、形心位置和取向角分布的随机性特征,并实现了Co相的体积分数的控制。结果表明,采用移动窗口法确定的代表性体积单元包含约120个晶粒;在拉伸实验中晶粒形状及其位置分布对各向异性的影响较小。弹性性能模拟结果和采用Golovchan模型计算及实验结果吻合较好,从而验证了该方法能够有效预测WC-Co硬质合金的弹性性能。
A two-dimensional parameterized model of mierostructure for WC-Co cemented carbides based on ＂ random method＂ was developed. The representative volume element was determined with moving window method. The elastic properties of WC-Co cemented carbides were calculated by numerical simulation of tension tests. The random distribution characteristics of topological parameters of the microstructure, such as average grain diameter, major and minor axis, centroid and orientation, were considered in the model, with Co volume fraction freely controlled. The results indicate that the representative volume element determined by moving window method should contain approximately 120 grains. The grain shape and centroid distribution have little effect on the anisotropy in the tension tests. The predicted results are in good agreement with the experimental results and the results obtained by means of Golovchan model, proving the validity of the proposed model in predicting the elastie properties of WC-Co cemented carbides.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第3期160-164,共5页
Transactions of Materials and Heat Treatment
基金
国家重点基础研究发展计划(2009CB724402)
国家自然科学基金(51175310)
山东大学优秀研究生科研创新基金(yyx10012)
关键词
WC-CO硬质合金
微观结构
随机分布模型
弹性性能
代表性体积单元
WC-Co cemented carbides
microstructure
random distribution model
elastic property
representative volume element
