摘要
在Gleeble-3800热模拟试验机上,对含硼与不含硼低碳钢进行模拟轧制热压缩试验,测定并绘制出连续冷却转变曲线(动态CCT曲线),分析了硼对试验钢动态CCT曲线及其微观组织的影响。结果表明,当在低碳钢中加入0.001%的硼时,其相变过程比无硼低碳钢稳定,并且由于硼元素的作用,铁素体、珠光体得到了有效地抑制,从而使动态CCT曲线右移。加入硼可使贝氏体在较低的冷却速度(0.2℃/s)下形成,因此在同等冷却速度条件下,可以获得更细小的板条状贝氏体组织,同时,获得马氏体的临界冷却速度降低,从而提高了该低碳钢的淬透性。
The microstructure and dynamic CCT curves of low carbon steels with different boron contents under different cooling rate were obtained by multi-pass hot compression deformation using Gleeble-3800 thermal mechanical simulator.The effects of boron on the microstructure and the dynamic CCT curves of the test steels were analyzed.The results show that the steel with boron content 0.001% has more stable transformation process than that without boron addition,and the formation of ferrite and pearlite can be restrained effectively by adding boron element,which leads to the dynamic CCT curves shifted to the right.Since bainite can be obtained under slower cooling rate（0.2 ℃/s） because of boron addition,the finer lath bainite can be obtained under the same cooling rate and the critical cooling rate to gain martensite decreases,which improves the hardenability of the steel.
出处
《金属热处理》
CAS
CSCD
北大核心
2011年第3期22-25,共4页
Heat Treatment of Metals
关键词
硼
低碳钢
连续冷却转变曲线
淬透性
boron
low carbon steel
dynamic CCT diagram
hardenability
