氧化物冶金工艺对EH36钢HAZ组织性能的影响

设计了Ti- Ca和Ti- Mg两种氧化物冶金脱氧工艺的EH36实验钢来考察粗晶热影响区的组织性能和冲击韧性。结果表明，两种处理工艺的实验钢热模拟后的焊接热影响区内都有大量细小的晶内针状铁素体产生；与Ti- Ca脱氧工艺相比，采用Ti- Mg脱氧工艺的实验钢，焊接热影响区中针状组织更加明显，夹杂物的类型也更加复杂，同时Ti- Mg复合脱氧工艺在焊接热循环中能够更好地钉扎奥氏体晶界。-40℃的冲击数据表明，Ti- Mg脱氧工艺处理后的实验钢HAZ冲击性能优于Ti- Ca处理工艺。

Effect of oxide metallurgy on microstructure and properties of HAZ in EH36 steel

EH36 experimental steels manufactured through two different oxide metallurgy processes with Ti- Ca and Ti- Mg were designed to investigate the microstructure, properties and impact toughness of coarse- grained heat affected zone. The results show that there are a large number of fine intragranular acicular ferrites in the welding heat affected zone after the thermal simulation of the two treatment processes in the experimental steels. Compared with that with the Ti- Ca deoxidation process, the experimental steel with Ti- Mg deoxidation process shows more obvious acicular ferrite and more complicated inclusions in the heat affected zone. Inclusions formed in Ti- Mg deoxidation process can restrain the movement of austenite grains during the welding thermal cycle. The impact toughness of HAZ at -40℃ in Ti- Mg deoxidized steel was better than that in Ti- Ca deoxidized steel.