TSCR流程生產鈦微合金化高強耐候鋼中的析出物

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基金項目:

國家自然科學基金資助項目(No.50334010)

Precipitates of Ti-microalloyed high-strength weather-resisting steel produced by TSCR process

1. Metallurgical and Ecological Engineering School, University of Science and Technology Beijing, Beijing 100083, China;
2. CSP Applying Technology Research Institute of GISE, Guangzhou 510730, China;
3. Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China

摘要: 運用電子顯微鏡和化學相分析等多種實驗手段研究了Ti微合金化高強耐候鋼中的析出物,并在熱力學計算的基礎上分析了其析出過程.結果表明:鋼中主要存在TiC,TiCN,Ti₄C₂S₂,TiN等析出物,連軋前TiN的析出過程已基本完成;大量納米尺寸的TiC球形析出物粒子在鐵素體的位錯線上分布;Ti含量增加改變了MC相的粒度分布,小尺寸粒子的體積分數顯著增加,增強了沉淀強化的效果.
- 薄板坯連鑄連軋(TSCR) /
- 鈦微合金化 /
- 高強耐候鋼 /
- 析出物
Abstract: Many experimental methods such as electron microscopy and chemical phase analysis were used to study the precipitates of high-strength weather-resisting steel with titanium addition, and the precipitation process was analyzed based on thermodynamics calculations. The results showed that the main particles in the steel were TiC, TiCN, Ti₄C₂S₂ and TiN, and almost TiN particles have precipitated before hot rolling. A large number of nanometer TiC particles distributed on dislocations in ferrite. The size distri- bution of MC phase changed with increasing titanium content. The obvious increase in volume fraction of small scale particles heightened the yield strength of the steel through precipitation strengthening.
- thin slab casting and rolling (TSCR) /
- titanium microalloying /
- high-strength weather-resisting steel /
- precipitates