激光冲击冷轧钼带的微观结构和性能

Property and Microstructures of Cold Rolled Molybdenum Strip by Laser Shock Processing

对多晶冷轧钼带进行激光冲击成形及其强化,分析了冲击试件的显微硬度和微观组织。结果表明:高应变速率激光冲击实现了脆性多晶冷轧钼带冷成形和改性双重效应;半搭接区域激光冲击强化的多晶钼带表面显微硬度符合高斯函数变化规律,具有更好的冲击强化效果,其显微硬度峰值变化范围为HV265-310;激光冲击强化可提高钼带耐高温性能。

The cold-rolled polycrystalline molybdenum strip was laser shocked by the Thales laser with the maximum output laser pulse energy of 12.5 J, and the microhardness and microstructure of shocked specimens were analyzed. The results show that laser shock at high strain rate can achieve a double effect of forming and modification of brittle polycrystalline cold-rolled molybdenum strip. The microhardness on the surface of the polycrystalline molybdenum strip in the half-lap region of laser shock processing accorded with variation of the Gaussian function, and the peak range was HV265-310. The thermostability of laser shocked molybdenum strip was improved.