摘要
在Gleeble-3500热模拟试验机上,在980℃以2s-1的变形速率,对一种连杆用高碳微合金非调质钢进行变形(真应变0.4)后,采用膨胀法测定其变形奥氏体的连续冷却转变曲线,并对变形奥氏体在不同冷速条件下的显微组织和硬度进行观察和测量。结果表明,该钢奥氏体经过高温变形后,其连续冷却转变曲线上,先共析铁素体转变区较小而珠光体转变区较大;室温组织为珠光体和少量铁素体的混合组织。随着冷却速度的提高,实验钢的显微硬度出现峰值,呈现出先增大后减小随后又增大的特征。
The continuous cooling transformation curve of deformed austenite with stain rate of 2s^-1 and true strain of 0.4 at 980 ℃in high carbon non-quenched and tempered steel for connecting rod was determined using Gleeble-3500 thermal/mechanical simulator. The microstructure was observed with the optical microscopy and the transmission election microscopy （TEM）. The results show that the transformation zone ofpro-eutectoid ferrite is smaller but that of pearlite is bigger on the CCT curve. At room temperature the microstructure of the testing steel consists of pearlite and a few ferrite. With the increase of cooling rate, a peak of microhardness of the steel appears, which first increases, then drops and increases again at last.
出处
《热加工工艺》
CSCD
北大核心
2009年第16期48-49,52,共3页
Hot Working Technology
关键词
连续冷却转变
热变形
奥氏体
高碳非调质钢
continuous cooling transformation
hot deformation
austenite
high carbon non-quenched andtempered steel
