An experimental steel billet of SA508 reactor pressure vessel material was manufactured by the additive forging method, and microstructure and mechanical properties of the hot-compression bonding interface were systematically investigated. The result indicated that oxidation levels of bonding interfaces were well controlled using vacuum electron beam welding. It was easy to discriminate interfaces from base materials during the optical microstructure observation, since interfaces were characterized by grain or phase boundaries in a straight line. Test results of uniaxial tensile experiments (at 20 and 350 °C) and Charpy V-notched impact tests (at 0 and 20 °C) showed that fracture behaviour of all those samples appeared at the base material, and bonding interfaces showed advantage of strength and toughness at the forge bonding state.

采用增材锻造法制造了SA508反应堆压力容器材料实验钢坯，系统研究了热压结合界面的显微组织和力学性能。结果表明，使用真空电子束焊接可以很好地控制键合界面的氧化水平。在光学微观结构观察过程中，很容易区分界面和基材，因为界面的特征在于直线上的晶粒或相界。单轴拉伸实验（20 和 350 ℃）和夏比 V 型缺口冲击试验（0 和 20 ℃）的测试结果表明，所有这些样品的断裂行为都出现在母材处，结合界面表现出强度优势和锻造结合状态下的韧性。