摘要
采用SEM、EBSD、TEM、SAXS、XRD及相分析等方法,对经过相同轧制及热处理工艺的含Ti与无Ti低碳马氏体钢组织及冲击韧性进行分析对比。结果表明:含Ti钢经900℃油淬后,析出大量5～36 nm尺寸范围内的TiC。析出相有效钉扎晶界,马氏体组织得到显著细化,有效晶粒尺寸达到4.6μm;同时TiC的大量析出还使得含Ti钢位错密度下降,弹性模量明显提高。经900℃油淬后,含Ti钢冲击韧性明显改善,冲击吸收功由无Ti钢的53 J大幅提高至265 J。
Microstructure and impact toughness of two kinds of low carbon martenstic steels with and without Ti which experienced the same rolling and heating treatment were investigated by means of SEM, EBSD, TEM, SAXS, XRD and precipitates were analyzed by electrolytic extraction method. The results show that lots of TiCs precipitated after oil quenching at 900 ℃ , the size of which mainly ranges from 5 nm to 36 nm. The martensite is significantly refined because of the effective pinning effect of precipitates on grain boundaries, and that the effective grain size can be refined to 4. 6 μm. Moreover, dislocation density of Ti-bearing steel is decreased and elastic modulus of that is increased, both which are induced by the large amount of precipitation of TiC. Impact toughness of Ti-bearing steel is obviously improved after oil quenching at 900 ℃. The impact energy is enhanced from 53 J to 265 J compared with the Ti-free steel.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第5期65-69,共5页
Transactions of Materials and Heat Treatment
基金
国家"973"计划(2010CB630803)
国家"863"计划项目(2511
2009AA033401)
青年科学基金项目(51101036)
关键词
含Ti钢
纳米析出相
有效晶粒尺寸
马氏体组织
冲击韧性
Ti-bearing steel
nano-sized precipitate
effective grain size
martensite
impact toughness
