Numerical Simulation And Experimental Study Of Low Activation Steel U-shaped Workpiece Extrusion Technology

The blanket is the core part of fusion reactor for the tritium breeding and fusion energy use and the low activation steel is considered to be the first choice of fusion reactor blanket structural material in the future.Low activation steel have some advantages including strong high-energy neutron irradiation capacity.low activation, good mechanical properties and good compatibility with coolant and proliferation agent. The first wall of fusion reactor was consists of number of cooling flow duct, it required high manufacturing precision and mechanical properties due to its special working conditions.The first wall of fusion reactor is mainly obtained by machining currently which has low productivity, low material utilization and poor mechanical properties.In this paper, the low activation steel hot compression test was be made.According to the data obtained establish low activation steel mechanical constitutive equation.Proposes using extrusion process molding a U-shaped workpiece which has first runner feature size.Deform-3D software was used to simulate the U-shaped member forming process.Analysis of the metal flow and filling mechanism, the maximum of stress and strain distribution.Independent design extrusion tooling, and extrusion experiments was made by using the best experimental parameters which get form simulated.Determination of sample size and and mechanical properties.The results show that a well U-shaped sample can be obtained by extrusion process. The die structure is reasonable and the test result is fit with the simulation. With the material utilization increases to more than 90%, the U-shaped realize near net shape basically with high production efficiency and ideal mechanical properties. The vertical channel cross-sectional area and the corner channel cross-sectional area where have highest size error requirements of U-shaped were controlled less than 5%.The research offer a new way of thinking for the first wall engineering production which meet mass production and has a broad application prospect.