摘要
用Gleeble 1500热模拟实验机进行了低碳钢不同温度下变形后自动落入水中的淬火实验,组织分析表明铁素体的组织形态在一定温度下发生了明显变化 结合变形后冷却过程膨胀曲线的测量结果,确定实验条件下应变诱导相变发生的上限温度为830℃左右.利用喷水淬火法试样冷却速度分布不均匀的现象,确定低碳钢变形后抑制铁素体析出的临界冷却速度为400℃/s,并采用此方法确定了应变诱导相变的上限温度.结合实验结果对应变诱导铁素体相变机制及发生的温度条件进行了分析.
By using Gleeble 1500 thermomechanical simulator the samples of low carbon steel were deformed at different temperatures and then quenched immediately by automatically dropping into water. The results indicate that the ferrite morphology changes at certain temperature when the deformation temperature decreased. From the experimental results of dilation-temperature curves during cooling process, the upper limit temperature of strain-induced transformation (SIT) A(d3) under present conditions is about 830 degreesC. In addition, the critical cooling rate of preventing ferrite precipitation during cooling process is determined to be about 400 degreesC/s by using spurting water quenched method. Using this method, the A(d3) is also determined. The mechanism and thermodynamic conditions of SIT were discussed.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第10期1031-1036,共6页
Acta Metallurgica Sinica
基金
国家重点基础研究发展规划资助项目 G1998061509
关键词
低碳钢
应变诱导相变
临界冷却速度
铁素体
膨胀法
low carbon steel
strain-induced transformation
critical cooling rate
ferrite
dilation method
