Abstract:High strength steel with yield strength of 600MPa was investigated under ultra fast cooling process compared with laminar cooling process. An analysis was therefore made via testing for mechanical properties, SEM, TEM and EDS. The results show that the ultra fast cooling process can improve the performance of steel compared with the conventional laminar cooling process;the amount of yield and tensile strength are increased by 90MPa and 60MPa respectively; the yield strength, tensile strength and elongation are 670, 740MPa and 19%, and impact energy at -20℃ is 105J; good strength and toughness are obtained under ultra fast cooling process. The microstructure of steel under ultrafast cooling process is fine ferrite, and good strength is caused by the refinement of ferrite and precipitates.
衣海龙,徐洋,孙明雪,刘振宇. 超快冷工艺下600MPa高强钢的组织与性能[J]. 钢铁, 2013, 48(2): 49-52.
YI Hai-long,XU Yang,SUN Ming-xue,LIU Zhen-yu. Microstructures and Properties of a 600MPa High Strength Steel Under Ultra Fast Cooling Process. Iron and Steel, 2013, 48(2): 49-52.
Yi H L,Xu Yang,Liu Z Y,et al.Influence of ultra-fast cooling technology on microstructure and mechanical properties of Ti-microalloyed steel[J].Advanced Materials Research,2011,337:414-417
[5]
Yi H L,Xu Yang,Liu Z Y,et al.Influence of ultra-fast cooling technology on microstructure and mechanical properties of Ti-microalloyed steel[J].Advanced Materials Research,2011,337:414-417
[6]
Li Fan,Yi H L,Liu Z Y,et al.Influence of cooling rate on the microstructures and properties of Q550[J].Applied Mechanics and Materials,2012,117-119:1705-1707
[6]
Li Fan,Yi H L,Liu Z Y,et al.Influence of cooling rate on the microstructures and properties of Q550[J].Applied Mechanics and Materials,2012,117-119:1705-1707
[7]
Herman J C,Donnay B,Leroy V.Precipitation kinetics of microalloying additions during hot-rolling of HSLA steels[J].ISIJ International,1992,32(6):779-785
[7]
Herman J C,Donnay B,Leroy V.Precipitation kinetics of microalloying additions during hot-rolling of HSLA steels[J].ISIJ International,1992,32(6):779-785
[8]
Misra R D K,Nathani H,Hartmann J E,et al.Microstructural evolution in a new 770MPa hot rolled Nb-Ti Microalloyed steel[J].Materials Science and Engineering A,2005,394(1-2):339-352
[8]
Misra R D K,Nathani H,Hartmann J E,et al.Microstructural evolution in a new 770MPa hot rolled Nb-Ti Microalloyed steel[J].Materials Science and Engineering A,2005,394(1-2):339-352
[9]
Charleux M,Poole W J,Militzer M,et al.Precipitation behavior and its effect on strengthening of an HSLA-Nb/Ti steel[J].Metallurgical and Materials Transactions A,2001,32(7):1635-1647
[9]
Charleux M,Poole W J,Militzer M,et al.Precipitation behavior and its effect on strengthening of an HSLA-Nb/Ti steel[J].Metallurgical and Materials Transactions A,2001,32(7):1635-1647
[10]
Cancio M J,Echaniz G,Perez T E.Characterisation of microalloy precipitates in the austenitic range of high strength low alloy steels[J].Steel Research,2002,73(8):340-345
[10]
Cancio M J,Echaniz G,Perez T E.Characterisation of microalloy precipitates in the austenitic range of high strength low alloy steels[J].Steel Research,2002,73(8):340-345