Effect of thermal cycles on microstructure of reduced activation steel fabricated using laser melting deposition
作者机构：School of Material Science and EngineeringTsinghua UniversityBeijing100084China Shagang School of Iron and SteelSoochow UniversitySuzhou215021JiangsuChina
出 版 物：《Journal of Iron and Steel Research(International)》 (钢铁研究学报（英文版）)
年 卷 期：2021年第28卷第3期
页 面：316-326页
核心收录：
学科分类：08[工学] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学]
基 金：This work was supported financially by the National Key R&D Program of China(Grant No.2018YFB1105801) the National Natural Science Foundation of China(Grant No.51701134).
主 题：Laser melting deposition Reduced activation steel Microstructure evolution Thermal cycle Finite element analysis
摘 要：Reduced activation steel was successfully fabricated by laser melting deposition employing a Gaussian and a ring-shaped laser.The microstructure evolution of the reduced activation steel was investigated using the scanning electron microscope,transmission electron microscope and electron backscatter diffraction.The experimental results showed that the grains close to the substrate were smaller than the grains in the upper layers.Compared to those deposited using a Gaussian laser,the samples deposited using a ring-shaped laser showed a more homogeneous microstructure.Furthermore,a finite element analysis(FEA)model was applied to reveal the thermal history during laser melting deposition.The simulation results were well validated with the experimental results.FEA results indicate that the peak temperature increases and the cooling rate decreases,as the layer gets further from the substrate.Additionally,the temperature and the cooling rate resulting from the Gaussian laser model were higher at the midline of the samples and lower around the edges,whereas those of the ring-shaped laser model were consistent with both at the center and around the edges.
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