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| Effect of Al and Ti Treatment on Microstructure of CoarseGrain HAZ in HSLA Steel |
| CHAI Feng1,2,YANG Caifu2,ZHANG Yongquan2,SU Hang2,XU Zhou1 |
| 1. Shanghai Jiaotong University, Shanghai 200030, China;2. Central Iron and Steel Research Institute, Beijing 100081, China |
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Abstract The Effect of Al and Ti treatment on coarsegrain HAZ microstructure in HSLA steel was investigated. The results showed that the inclusions in Al treated steel are mainly aluminum oxides and titanium nitrides. Aluminum oxide and Titanium nitride could not promote the formation of acicular ferrite. Microstructure of coarsegrain HAZ of Al treated steels consists of heavy ferrite in grain boundaries and ferrite side plate. The inclusions in Ti treated steel are Al,Ti,Mg,Ca composite oxides with size in the range of 0.53 μm and titanium nitride. Ti composite oxide could promote the formation of acicular ferrite and microstructure of coarsegrain HAZ of Ti treated steel consists of ferrit in grain boundaries, ferrite side plate and large amount of intragranular acicular ferrite.The size of ferrite in grain boundaries is increased and the amount of ferrite side plate is decreased with the increase of soaking time at the peak temperature. The amount of ferrite in grain boundaries and the size of acicular ferrite is increased with the increase of cooling rate during phase formation.
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Received: 01 January 1900
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2007, Vol. 42 
