Abstract
Intense pulsed ion beam irradiation on IN718 superalloy prepared with selective laser melting as an after-treatment for surface melting is introduced. It is demonstrated that intense pulsed ion beam composed of protons and carbon ions, with a maximum current density of 200 A/cm2 and a pulse length of 80 ns, can induce surface melting and the surface roughness changes significantly due to the generation of micro-defects and the flow of the molten surface. Irradiation experiments and thermal field simulation revealed that the energy density of the ion beam plays a predominant role in the irradiation effect—with low energy density, the flow of molten surface is too weak to smooth the fluctuations on the surface. With high energy density, the surface can be effectively melted and smoothened while micro-defects, such as craters, may be generated and can be flattened by an increased number of pulses. The research verified that for the surface melting with intense pulsed ion beam (IPIB), higher energy density should be used for stronger surface fluidity and a greater pulse number is also required for the curing of surface micro-defects.
Highlights
Superalloys, for their high strength, high toughness and corrosion resistance, are widely used in aircraft gas turbine blades and industrial gas turbine guide blades [1]
As the Selective laser melting (SLM) parts after bulk thermal treatment often come with an oxidation layer and the surface roughness is much larger than that can be effectively processed by intense pulsed ion beam (IPIB), the surface for irradiation was pre-treated with 1000-grit SiC paper and cleaned in ethyl alcohol
As exhibited in the surface morphology observation, after the pre-treatment with SiC paper, the surfaces of the IN718 samples are covered with regular scratches, as shown in Figures 2a and 3a
Summary
Superalloys, for their high strength, high toughness and corrosion resistance, are widely used in aircraft gas turbine blades and industrial gas turbine guide blades [1]. The complex inner cavity structure and cantilever structure make these parts challenging to build with traditional manufacturing methods. IN718 superalloy parts, which are widely used in aero-engines, can be processed by SLM and after heat treatment, the performance of the part is no less than those made by traditional methods [1,2,3,4,5]. Superalloys have good weldability without post-weld cracking tendency [6], and are potential candidates for laser additive manufacturing. Superalloys such as IN600, IN690, IN713 are widely used in the research of laser additive manufacturing [7,8]
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call