Performance of the different swaged tungsten grades under transient high heat loads

Abstract

Transient high heat loads simulations by using the electron beam facility have been performed on two swaged tungsten grades at several power loads with a pulse duration of 5 ms. The cracking patterns of the two swaged tungsten grades are quite similar. All cracks occurred along the grain boundary and located across the loaded area. The cracks can be distinguished with two levels, major cracks with larger crack width but lower crack density and microcracks with smaller crack width but higher crack density. The higher the deformation level of swaged tungsten and heat loading power density, the smaller the major crack density will be, but there is no obvious difference in the microcracks pattern. No melting occurred for both swaged tungsten grades after transient heat loading at power density of 0.88 GW m−2.