摘要
通过在Gleeble-1500热模拟试验机上的模拟加热和冷却实验,研究了在不同温度下珠光体等温转变后,珠光体轨钢的显微组织和力学性能。结果表明:随着等温温度的升高,相同奥氏体化温度下,相变后珠光体组织中珠光体域的尺寸也随之增大,珠光体片间距随相变温度的升高也逐渐增大。实验钢的力学性能测定结果表明,硬度随着相变温度的升高,呈直线下降趋势;室温冲击韧度随等温温度的升高,也呈下降趋势。从珠光体转变机理方面,对上述关系进行了分析,阐明了相变温度对控制珠光体钢轨组织和性能的影响。
The full pearlite rail steel microstructure and mechanical properties at different isothermal temperatures and the same austenization temperature were investigated by Gleeble-1500 thermal-mechanical simulator.The results show that with the isothermal temperature increasing,the pearlite colony size increases after phase transition at the same austenization temperature,while the interlamellar spacing of the steel was also increased.The mechanical properties measured results show that the hardness of the steel decreases with the isothermal temperature increasing,and the impact toughness also decreases.The relationship between the isothermal temperature,pearlite microstructure and the mechanical properties were analyzed from the mechanism of pearlite transformation.The effects of isothermal temperature on the microstructure and properties of fully pearlitic rail steels were clarified.
出处
《热加工工艺》
CSCD
北大核心
2012年第10期67-70,共4页
Hot Working Technology
关键词
相变温度
珠光体
轨钢
isothermal temperature
pearlite
rail steel
