脉冲电流-激光愈合钛合金深层裂纹愈合处理对力学性能的影响机理研究

发布时间：2018-04-22 12:53

  本文选题：脉冲电流 + 激光　； 参考：《机械工程学报》2017年18期

【摘要】：分别借鉴脉冲电流与激光各自的优势对钛合金中的深层裂纹进行复合处理,研究脉冲电流-激光愈合处理对力学性能的影响机理。微观硬度检测结果显示,经过脉冲电流处理后,愈合区与基体间硬度差异明显,愈合区具有较高的硬度值;经过激光重熔处理后,由脉冲电流处理形成的愈合区内硬度有所下降,且在重熔区-热影响区-基体内硬度呈现出逐渐递减的趋势。力学性能测试结果显示,对脉冲电流处理试样,拉伸性能降低,疲劳性能提升,且性能曲线均呈现二次断裂特性,这是由于愈合区的塑性较低,且处于应力集中区域,在加载过程中造成愈合区提前断裂或失效。对脉冲电流与激光复合处理试样,拉伸与疲劳性能提升明显。脉冲电流的绕流效应、焦耳热效应及激光的重熔作用是实现裂纹愈合效果的主要原因。
[Abstract]:The deep cracks in titanium alloy were treated by using the advantages of pulse current and laser, respectively, and the mechanism of pulse current-laser healing on mechanical properties was studied. The results of microhardness test show that after pulse current treatment, the hardness difference between the healing zone and the matrix is obvious, and the healing zone has a higher hardness value, and after laser remelting treatment, The hardness of the healing zone formed by pulse current treatment decreased, and the hardness decreased gradually in the remelting zone, the heat-affected zone and the base. The results of mechanical properties test show that the tensile properties of the samples treated with pulse current are decreased, the fatigue properties are improved, and the performance curves show secondary fracture characteristics, which is due to the low plasticity in the healing zone and the stress concentration region. During loading, the healing zone breaks or fails ahead of time. The tensile and fatigue properties of the samples treated with pulsed current and laser are improved obviously. The effect of pulse current, joule heat and laser remelting are the main reasons for the effect of crack healing.
【作者单位】： 大连理工大学机械工程与材料能源学部;沈阳鼓风机集团股份有限公司研究院;大连理工大学辽宁省凝固控制与数字化制备技术重点实验室;
【基金】：国家重点基础研究发展计划(973计划,2011CB013402) 辽宁省自然科学基金(2014028002) 辽宁省科技创新重大专项(201303002) 辽宁重大装备制造协同创新中心 沈鼓-大工重大科研发展基金 中央高校基本科研业务费专项资金资助项目
【分类号】：TG146.23;TG178
，

本文编号：1787298