针对焊接线能量对船板钢HAZ冲击韧性的影响开展了包括冲击试验、断口分析和显微组织分析等一系列的研究.结果表明,在-20℃下,16和40mm厚的钢板在大线能量焊接后HAZ冲击吸收能量均超过160 J,而25 mm的冲击吸收能量为57.5 J;16和40mm厚的钢板热影响区断口为典型的韧性断裂,25 mm厚的钢板为准解理断裂.在显微组织方面,三种厚度钢板的热影响区均诱发了大量的晶内针状铁素体,使组织细化,甚至优于原板组织.25 mm厚钢板热影响区的冲击韧性相对较差,其原因一方面是所承受热负荷较大,另一方面则是其母板的组织相对粗大.
For the study on the effect of welding heat input on the HAZ impact toughness of shipbuilding steel,a series of research including impact test,fracture analysis and microstructure analysis had been carried out.The results showed that by welding with large line energy,the HAZ impact energy at-20 ℃ of steel plate with thickness of 16 mm or 40 mm was more than 160 J,but the value of 25 mm thick steel plate was only 57.5 J;the HAZ fractures of 16 mm and 40 mm thick steel plates were typical ductile fracture,while the HAZ fracture of 25 mm thick one was quasi cleavage fracture.In terms of microstructure,there were a large number of intragranular acicular ferrite(IAF) in the HAZ,which could make the microstructure refine,and even better than the microstructure of original plate.The impact toughness of HAZ of 25 mm thick steel plate was relatively low,because its heat load was larger,and the microstructure of original plate was also coarser than the other two.
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