特大型替打环用钢HG80的连续冷却相变行为
Continuous cooling phase transformation behavior of extra large replacement ring steel HG80
程振飞 1贺俊光 1庞庆海 2陈学文 1殷立涛 2徐栋栋1
作者信息
- 1. 河南科技大学材料科学与工程学院,河南洛阳 471003
- 2. 洛阳中重铸锻有限责任公司,河南 洛阳 471000
- 折叠
摘要
通过Formastor-F Ⅱ热膨胀相变仪对HG80钢在连续冷却过程中的热膨胀曲线进行测定,结合微观组织和维氏硬度绘制其连续冷却转变曲线(CCT曲线),分析不同冷却速度对其组织转变的影响.结果表明:在连续冷却过程中,HG80钢发生了奥氏体向铁素体、珠光体、贝氏体和马氏体的相变;当冷却速度小于0.1 ℃/s时,HG80钢的组织为铁素体和珠光体,此时显微硬度较低,为214 HV2;当冷却速度为0.3～0.5 ℃/s时,组织为铁素体、珠光体和贝氏体,显微硬度增加到240 HV2;当冷却速度升高到3℃/s时,组织为铁素体和贝氏体,显微硬度为299 HV2;当冷却速度为5～20℃/s时,组织为贝氏体和马氏体,显微硬度快速增加;当冷却速度大于20℃/s时,只发生马氏体转变,显微硬度达到最高,为571 HV2.
Abstract
The thermal expansion curve of HG80 steel during continuous cooling was measured using the Formator-FⅡ thermal expansion phase change instrument.The continuous cooling transformation curves(CCT curves)of the experimental steel were plotted based on the microstructure and Vickers hardness,and the effect of different cooling rates on its microstructure transformation was analyzed.The results show that during the continuous cooling,HG80 steel undergoes a phase transformation from austenite to ferrite,pearlite,bainite and martensite.When the cooling rate is less than 0.1 ℃/s,the microstructure of the HG80 steel is ferrite and pearlite,and the microhardness is relatively low,which is 214 HV2.When the cooling rate is 0.3-0.5 ℃/s,the microstructure consists of ferrite,pearlite and bainite,and the microhardness increases to 240 HV2.When the cooling rate increases to 3 ℃/s,the microstructure is ferrite and bainite,and the microhardness is 299 HV2.When the cooling rate is 5-20 ℃/s,the microstructure is bainite and martensite,and the microhardness increases rapidly.When the cooling rate is greater than 20 ℃/s,only martensitic transformation occurs,and the microhardness reaches its highest value of 571 HV2.
关键词
HG80钢/连续冷却/CCT曲线/微观组织/维氏硬度Key words
HG80 steel/continuous cooling/CCT curve/microstructure/Vickers hardness引用本文复制引用
基金项目
国家重点研发计划(2020YFB2008400)
河南省重大科技专项(221100230200)
出版年
2024
NETL
NSTL
万方数据