摘要
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组织,韧性恶化。降低钢中的C含量及碳当量(Ceq)、细化焊接热影响区奥氏体晶粒尺寸以及改善焊接热影响区的组织是发展大线能量焊接用钢的主要技术措施。"氧化物冶金"技术利用钢中细小的氧化物,通过促进晶内针状铁素体形核明显改善焊接热影响区的组织,成为大线能量焊接用钢最有效的技术途径。实验结果表明:Ti-Mg复合处理明显细化钢中氧化物颗粒尺寸,促进了晶内针状铁素体形核,在100～200kJ/cm的大线能量焊接条件下粗晶热影响区得到针状铁素体为主的组织,-20℃冲击功达到350J。
As the long dwell time of high temperature and slow cooling rate in phase transformation during high heat input welding, the austenite grain rapidly grew in heat -affected zone （ HAZ）, the microstructure was composed mainly by ferrite side - plate which deteriorated the toughness property. The main technical measures to develop the high heat input welding steel included decreasing the carbon content and carbon equivalent of steel, refining the austenite grain size and improving the microstructure of heat - affected zone （HAZ）. Oxide Metallurgy Technology has become the most effective technical way for high heat input welding steel by significantly improving the microstructure of heataffected zone （HAZ） through stimulating aeicular ferrite nucleation by making use of fine oxide particles in steel. The results showed that the Ti -Mg composite treatment obviously refine oxide particles, and enhance the aeieular ferrite nucleation. Under the high heat input welding condition of 100kJ/cm to 200kJ/cm, the microstructure of Coarse Grain Heat Affected Zone was mainly acicular ferrite, and the impact toughness value testing at -20℃ reached to 350J.
出处
《上海金属》
CAS
2010年第1期1-10,共10页
Shanghai Metals
关键词
大线能量焊接
船体钢
氧化物冶金
焊接热影响区
低温韧性
High Heat Input Welding, Ship Hull Steel, Oxide Metallurgy, Heat Affected Zone （ HAZ）, Low - Temperature Toughness
作者简介
杨才福，男，教授级高工，主要从事低合金钢研究，Email：Yangcaifu@nercast．com
