大线能量焊接船板钢的研究现状与发展

大线能量焊接过程中，焊接HAZ高温停留时间延长，相变冷却速度减慢，HAZ奥氏体晶粒急剧长大。采用TiN、Ti-B等技术抑制HAZ奥氏体晶粒长大以提高大线能量焊接性能难以满足更高线能量的要求。氧化物冶金技术的提出对大线能量焊接用钢HAZ韧性的改善具有重要的意义。文章主要叙述了大线能量焊接HAZ韧性改善的方法以及发展方向，并重点对稀土Y应用于大线能量焊接HAZ韧性改善的可能性进行分析预测。

Research situation and development of ship plate steel by high heat input welding

With the increased high temperature residence time and decreased phase change cooling rate during high heat input welding, the austenite grains rapidly grow in heat affected zone. The technologies of improving large heat input welding performance by applying TiN, Ti-B to inhibit the austenite grain growth fail to meet the requirements of higher welding line energy. Oxide metallurgy technology has the vital significance for improving welding property of the heat affected zone. On the basis of describing the method and development direction for improving the toughness and large heat input welding HAZ, the possibility to improve toughness of the heat affected zone by applying yttrium are analyzed.