摘要
对直径为φ195mm的Ti-V微合金化26CrMoV钢(/%:0.27C,0.45Mn,0.25Si,0.006P,0.004S,0.97Cr,0.78Mo,0.002Ti,0.043V)热轧棒材取样后在热处理试验室分别按880℃淬火+645℃回火和925℃正火+880℃淬火+645℃回火两种工艺进行热处理。通过检测其皮下25.4mm处力学性能,发现两种热处理工艺试样的屈服及抗拉强度相近,淬火+回火处理的-20℃横向冲击功为46-47 J,而正火+淬火+回火处理的-20℃横向冲击功为79-86 J,改善效果明显。对比观察发现经正火预处理后钢的回火索氏体及铁素体组织更加均匀、细小。
The Ti-V microalloying 26CrMoV steel(/%:0.27C,0.45Mn,0.25Si,0.006P,0.004S,0.97Cr,0.78Mo,0.002Ti,0.043V)φ195 mm hot-rolled bar is treaded at laboratory by two processes:880℃ quenching+645℃ tempering and 925℃ normalizing:880℃ quenching+645℃ tempering.It is found that at the subsurface 25.4 mm of bar the yield and tensile strength of the bar by the two heat treatment processes are similar,the -20℃ transverse impact energy of the bar treated by quenching+tempering is 46~47 J,but that treated by normalizing+quenching+tempering is 79~86 J,the improvement effect is obvious.It is found that the microstructure of tempered sorbite and ferrite in steel with normalizing pretreatment is more uniform and smaller than that with out normalizing pretreatment.
作者
曾云
张越
李博鹏
彭峰
胡瑞海
郑锦锋
段松
廖凯
Zeng Yun;Zhang Yue;Li Bopeng;Peng Feng;Hu Ruihai;Zheng Jinfeng;Duan Song;Liao Kai(Technology Center,Daye Special Steel Co Ltd,Huangshi 435001;Hubei Key Laboratory of High Quality Special Steel,Huangshi 435001;Huangshi Product Quality Supervision and Inspection Instition,Huangshi 435000)
出处
《特殊钢》
2021年第5期75-77,共3页
Special Steel
关键词
正火预处理
调质棒材
横向低温冲击
Normalizing Pretreatment
Quenched and Tempered Bar
Low Temperature Transverse Impact