摘要
在略低于Ac_1的温度对试验钢进行退火加热,由于铁、碳等元素的扩散,α相通过回复、再结晶形成多边形的铁素体,渗碳体不断聚集、长大成粗粒状,渗碳体的球化成为软化的主要因素。研究结果表明,进行660℃×20h,炉冷至小于300℃空冷的退火处理,可获得良好的机械加工性能,既经济又实效。
DT300 steel was carded out annealing below ,Ac1 a little.The α phase formed polygonal ferrite through reversion and recystallization, and cementite assembled and grew up into coarse grain because Fe and C elements got diffusion enough.Spheroidization of cementite is the main factor in softening.The results show that excellent machining properies are obtained under the condition of annealing at 660℃ ×20 h followed furnace cool until 300 ℃ ,which is economic and effective.
出处
《热加工工艺》
CSCD
北大核心
2007年第2期49-51,共3页
Hot Working Technology
关键词
DT300
正火
退火
硬度
微观组织
DT300
normalizing
annealing
hardness
microstructure
