Microstructure, mechanical property and metal release of As-SLM CoCrW alloy under different solution treatment conditions
Microstructure, mechanical property and metal release of As-SLM CoCrW alloy under different solution treatment conditions
复制标题
DOI：
10.1016/j.jmbbm.2015.10.019
复制
发表时间：
2016-03-01
影响因子：
3.9
通讯作者：
Lin, Jinxin
中科院分区：
文献类型：
--
作者：
Lu, Yanjin;Wu, Songquan;Lin, Jinxin
在该研究中，系统研究了不同固溶处理条件下选择性激光熔化CoCrW合金的微观结构、机械性能和金属释放行为，以评估其在骨科植入物中的潜在用途。分别通过OM、SEM、XRD、拉伸试验和ICP-AES系统研究了固溶处理对显微组织、力学性能和金属释放的影响。 XRD表明，在固溶处理过程中，合金经历了γ-fcc相向epsilon-hcp相的转变；水淬后在 1200 摄氏度下处理时，ε-hcp 相几乎在合金中占主导地位； OM、SEM结果表明，不同固溶处理下显微组织发生了变化； 1150℃下的固溶炉冷有助于在晶界区域形成较大的析出物，而当加热到1100℃以上时进行水淬时，析出物的尺寸和数量减少；此外，水淬后，在超过1150℃的较高固溶温度下，类金刚石结构是看不见的；与炉冷相比，水淬合金表现出优异的力学性能和较低的金属释放量；当合金加热到1200℃时，合金的力学性能达到最佳组合，UTS=1113.6 MPa，0.2% YS=639.5 MPa，E%=20.1%，同时金属释放总量较低。研究表明，适当的固溶处理是提高 As-SLM CoCrW 合金机械性能和耐腐蚀性能的有效策略，且具有可接受的拉伸延展性。 (C) 2015 Elsevier Ltd. 保留所有权利。
In the study, the microstructure, mechanical property and metal release behavior of selective laser melted CoCrW alloys under different solution treatment conditions were systemically investigated to assess their potential use in orthopedic implants. The effects of the solution treatment on the microstructure, mechanical properties and metal release were systematically studied by OM, SEM, XRD, tensile test, and ICP-AES, respectively. The XRD indicated that during the solution treatment the alloy underwent the transformation of gamma-fcc to epsilon-hcp phase; the epsilon-hcp phase nearly dominated in the alloy when treated at 1200 degrees C following the water quenching; the results from OM, SEM showed that the microstructural change was occurred under different solution treatments; solution at 1150 degrees C with furnace cooling contributed to the formation of larger precipitates at the grain boundary regions, while the size and number of the precipitates was decreased as heated above 1100 degrees C with the water quenching; moreover, the diamond-like structure was invisible at higher solution temperature over 1150 degrees C following water quenching; compared with the furnace cooling, the alloy quenched by water showed excellent mechanical properties and low amount of metal release; as the alloy heated at 1200 degrees C, the mechanical properties of the alloy reached their optimum combination at UTS=1113.6 MPa, 0.2% YS=639.5 MPa, and E%=20.1%, whilst showed the lower total quantity of metal release. It is suggested that a proper solution treatment is an efficient strategy for improving the mechanical properties and corrosion resistance of As-SLM CoCrW alloy that show acceptable tensile ductility. (C) 2015 Elsevier Ltd. All rights reserved.