激光喷丸对Ti-6Al-4V钛合金中高温性能影响研究
发布时间：2018-07-27 09:18
【摘要】：为了研究激光喷丸对中高温条件下Ti-6Al-4V钛合金残余应力、微观硬度及金相组织演变的影响,采用高功率、短脉冲Nd∶YAG激光器对Ti-6Al-4V钛合金表面进行了激光冲击,并将冲击后的试样分别置于400℃,500℃,550℃和600℃的温度下进行了1h的保温处理。利用X射线衍射仪对强化区域的残余应力进行了检测,通过扫描电镜及透射电镜对微观组织进行表征,探究了强化效果与晶粒尺寸、位错运动间的联系。结果表明,激光喷丸处理在试样表层诱导产生较大幅值残余压应力,显微硬度提高;经550℃热处理1h后,残余应力影响层深约为100μm;经400℃、600℃热处理1h后,试样表层微观硬度分别下降了8.3HV和20.1HV;热处理后,晶粒尺寸总体呈现增大趋势。激光喷丸处理可以有效提高Ti-6Al-4V钛合金中高温力学性能。
[Abstract]:In order to study the effect of laser shot peening on the residual stress, microhardness and microstructure evolution of Ti-6Al-4V titanium alloy at medium and high temperature, a high power, short pulse Nd:YAG laser was used to shock the surface of Ti-6Al-4V titanium alloy. The impact samples were treated for 1 h at 400 鈩，
本文编号：2147344
[Abstract]:In order to study the effect of laser shot peening on the residual stress, microhardness and microstructure evolution of Ti-6Al-4V titanium alloy at medium and high temperature, a high power, short pulse Nd:YAG laser was used to shock the surface of Ti-6Al-4V titanium alloy. The impact samples were treated for 1 h at 400 鈩，
本文编号：2147344
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