Characterization of local mechanical properties of laser-cladding H13–TiC composite coatings using nanoindentation and finite element analysis
Characterization of local mechanical properties of laser-cladding H13–TiC composite coatings using nanoindentation and finite element analysis
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DOI：
10.1016/j.matdes.2012.02.028
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发表时间：
2012-08
影响因子：
8.4
通讯作者：
Shengting Gu;Guozhong Chai;Huaping Wu;Yumei Bao
中科院分区：
文献类型：
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作者：
Shengting Gu;Guozhong Chai;Huaping Wu;Yumei Bao
采用激光熔覆技术制备了H13-TiC复合涂层，并采用纳米压痕法对涂层的微观力学性能进行了测试。研究了压痕深度对复合涂层各组分性能的影响，并通过一个简单的模型研究了颗粒形态对颗粒模量和硬度的影响。采用实验和有限元分析相结合的方法，观察了纳米压痕诱导TiC颗粒破裂的过程，得到了TiC颗粒的临界断裂应力。压痕过程由颗粒的理想弹塑性行为和基体的弹塑性硬化来模拟，并采用了颗粒断裂的临界最大拉应力准则。TiC颗粒的杨氏模量和硬度分别为456± 36 GPa和38.2±3.7GPa，基体的杨氏模量和硬度分别为255± 35 GPa和9±2GPa。模拟结果与实验结果的比较给出了临界最大拉应力的估计值为5.2±0.7GPa。
The H13–TiC composite coatings were synthesized by the laser cladding and the mechanical properties of particle and matrix phases at the microscopic scales were measured by the non-destructive testing (nanoindentation). The influence of indentation depth on the individual constituent properties of composite coating was investigated and the particle morphology effect on the particle modulus and hardness was studied by a simple model. The TiC particle crack induced by nanoindentation was observed and the critical fracture stress of TiC particle was obtained by the combination of experiment and finite element analysis. The indentation process was modeled by the perfect elastic–plastic behavior of particle and elastic–plastic hardening of matrix, while a critical maximum tensile stress criterion for particle fracture initiation was adopted. The Young’s modulus and hardness of TiC particle were obtained to be 456±36GPa and 38.2±3.7GPa, respectively, while those of matrix were 255±35GPa and 9±2GPa, respectively. The comparison between the simulations and experimental results gives an estimation of the critical maximum tensile stress of 5.2±0.7GPa.