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分析了中国船舶工业的现状、成就、挑战及发展趋势。为了提高船舶制造效率,采取了增加焊接线能量的措施。大线能量焊接时,由于高温停留时间长,相变冷却速度慢,焊接热影响区奥氏体晶粒急剧长大,得到侧板条铁素体为主的凝固组织,韧性恶化。氧化物冶金技术利用钢中的细小氧化物,通过促进晶内铁素体形核可明显改善焊接热影响区的组织。叙述了氧化物冶金的主要内容和该技术对船板钢的组织和性能的影响。介绍了日本一些钢铁公司开发的大线能量焊接高强船板钢氧化物冶金新技术。
The current situation, achievements, challenges and development trends of China’s shipbuilding industry are analyzed. In order to improve the efficiency of shipbuilding, measures have been taken to increase the welding line energy. Large wire energy welding, due to the high temperature dwell time, slow phase transformation cooling, heat affected zone austenite grain sharp growth, get the side strip of ferrite-based solidified structure, toughness deterioration. Oxide metallurgy utilizes fine oxides of steel to significantly improve the microstructure of the weld HAZ by promoting intragranular ferrite nucleation. Described the main contents of oxide metallurgy and the impact of this technology on the structure and properties of shipboard steel. Introduced a number of Japanese steel companies to develop a large line of energy welded steel plate metallurgy new technology.