摘要
利用相同的激光熔覆工艺条件,在H13钢基材上制备了不同TiC颗粒含量的H13-TiC复合涂层。采用准静态拉伸实验,获得了复合涂层的弹塑性应力应变曲线。实验结果显示,复合涂层达到屈服强度后,硬化效应明显;颗粒含量提高,其弹性模量和屈服强度相对增加,但抗拉强度变化不明显。利用扫描电镜(SEM)观测试样拉伸后的断口形貌,在TiC颗粒含量较低的情况下,断口分布有大量韧窝,呈韧性断裂,随着TiC颗粒的增多,断裂方式从韧性向脆性转变。基于Mori-Tanaka平均场理论,耦合ABAQUS子程序UMAT,对颗粒增强复合涂层进行了弹塑性的数值模拟,在一定误差范围内,理论预测与实验结果基本吻合。
By the same laser cladding process,TiC reinforced H13 matix composite coatings with different contents of TiC particles are fabricated on H13 substrate.The quasi-static tensile properties and stress/strain curves of composite coatings are obtained.The experimental results show that the hardening effect is obvious after stress reaches the yield stress.With higher particle content,the elastic modulus and yield stress increase significantly,but the tensile strength does not change much.With scanning electronic microscope（SEM） observation after tensile fracture,at low content of TiC particles,the fractography distributes a large number of dimples,showing the ductile fracture,but with the increase of particles,the fracture mode changes from ductile to brittle.Based on the Mori-Tanaka mean-field homogenization scheme,coupling with ABAQUS subroutine UMAT,elasto-plastical properties of composite coatings are studied.Theoretical prediction agrees with the experimental results in a certain range of error.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2011年第6期186-191,共6页
Chinese Journal of Lasers
基金
国家自然科学基金(50675205)
浙江省自然科学基金(Y4090451)资助课题
