Abstract：In order to stabilize the intercritical temperature quenching process and industrial production,effect of three different heat treatment processes,including normalizing+intercritical quenching+tempering,on-line quenching+intercritical quenching+tempering,off-line quenching+intercritical quenching+tempering,on the microstructure and mechanical properties of 690 MPa grade marine engineering steel plate was studied. The results show that the optimal process is the off-line quenching+intercritical quenching+tempering,which greatly improve the low temperature impact toughness and elongation of steel plate with ensuring high strength and low yield ratio. The fracture morphology is all dimples and shows obvious ductile fracture. With the increase of holding time,the strength increases gradually,but the strength and lamellar ferrite change slightly when the holding time exceeds 30 min. Although high strength and low yield ratio can be guaranteed by on-line quenching+intercritical quenching+tempering,the impact energy shows relatively discrete and the stability is poor. The fracture morphology is mixed,mainly ductile fracture. The normalizing+intercritical quenching+tempering is the least effective especially for the low temperature impact toughness of steel plate. The fracture morphology is cleavage and shows clear brittle fracture. The strip ferrite morphology is the key factor of determining the low temperature toughness of the steel plate.
王通, 张朋, 王九清, 庞辉勇, 龙杰, 赵喜伟. 原始组织对690 MPa级海工钢亚温淬火后强韧性的影响[J]. 钢铁, 2020, 55(12): 72-80.
WANG Tong, ZHANG Peng, WANG Jiu-qing, PANG Hui-yong, LONG Jie, ZHAO Xi-wei. Effect of original structure on strength and toughness of 690 MPa grade marine engineering steel after intercritical quenching[J]. Iron and Steel, 2020, 55(12): 72-80.
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2020, Vol. 55 
