摘要
采用热模拟试验机、电子显微镜、扫描电镜等手段,研究了冷却速度对低合金高强钢显微组织的影响。结果表明:在0.2~3.0℃/s低冷却速度条件下,低合金高强试验钢的显微组织变化为从铁素体/珠光体+下贝氏体到铁素体+下贝氏体,再到铁素体+针状铁素体,最后在3℃/s冷却冷却速度下,试验钢为单一的针状铁素体组织。随着冷却速度的提高,试验钢中铁素体体积分数逐渐降低。在10~60℃/s高冷却速度条件下,试验钢从状铁素体+马氏体混合组织逐渐转变为单一马氏体组织,随着冷却速度提高,针状铁素体含量逐渐减少,马氏体含量逐渐增加。
The effect of cooling rate on the microstructure of low alloy high strength steel was studied by means of thermal simulation test machine,electron microscope and scanning electron microscope.The results show that the microstructure of low alloy high strength steel changes from ferrite/pearlite+lower bainite to ferrite+lower bainite,then to ferrite+acicular ferrite at low cooling rate of 0.2-3.0℃/s.Lastly,the test steel is a single acicular ferrite structure at 3℃/s cooling rate.With the increase of cooling rate,the volume fraction of ferrite in the test steel decreases gradually.At the condition of high cooling rate of 10-60℃/s,the mixed structure of ferrite and martensite in the test steel gradually transforms into a single martensite structure.With the increase of cooling rate,the content of acicular ferrite decreases gradually and the content of martensite increases gradually.
作者
胡波
HU Bou(Long Products Plant,Inner Mongolia Baotou Steel Union Co.,Ltd.,Baotou 014010,China;Materials and Metallurgy School,Inner Mongolia University of Science and Technology,Baotou 014010,China)
出处
《热加工工艺》
北大核心
2021年第20期159-161,共3页
Hot Working Technology
关键词
低合金高强钢
冷却速度
组织
针状铁素体
马氏体
low alloy high strength steel
cooling rate
microstructure
acicular ferrite
martensite
