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題 名 | 汽車結構用冷軋高強度低合金鋼420LA開發=Development of Cold Rolled High Strength Low Alloy Steel-420LA for Automotive Structure |
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作 者 | 王泰翔; 柯旭勛; 涂泰年; | 書刊名 | 鑛冶 |
卷 期 | 58:4=228 2014.12[民103.12] |
頁 次 | 頁33-44 |
分類號 | 454.8 |
關鍵詞 | 高強度低合金鋼; 析出強化; 細晶強化; HSLA; 420LA; Precipitation strengthening; Grain refining strengthening; |
語 文 | 中文(Chinese) |
中文摘要 | 因應輕量節能及提高安全性需求,應用固溶強化、熱機控制軋延(TMCP),及搭配適當退火等冶金設計,中鋼開發最高強度等級汽車結構用冷軋高強度低合金鋼420LA。固溶元素提供基礎強度,熱軋TMCP製程發揮細晶與析出強化效果:分別於再結晶停止溫度(TR)以上、以下粗軋與精軋可使晶粒細化及應變誘導析出強化。由實驗結果,Ti-Nb-V複合成分具有較高的TiN析出物比例,提升析出強化效果;厚板冷軋裁減率低,退火晶粒較大,導致強度偏低,因此針對厚板與縱向機性要求產品,進行低退火溫度設計,以提高強度表現。另於精煉製程加入Ca-Si處理,減少縱向MnS析出,提高清淨度。經以上冶金設計,420LA產品強度水準達440MPa,伸長率23~25%,並提升強塑積表現,優化汽車結構用鋼吸收破壞衝擊之能力。 |
英文摘要 | For weight lightening, energy saving and safety requirements, China Steel Co. (CSC) has developed the highest grade of automotive structural use HSLA (High Strength Low Alloy Steel)- 420LA. The strength enhanced by solid solution strengthening, grain refining by Thermomechanical Controlling Process (TMCP) during hot rolling, and appropriate annealing design. C, Mn, P, Si solid solutions provide the basic strength of HSLA. Complex precipitates and grain refining further improved the mechanical property. With the control of rough and fine rolling temperature above and below TR (Recrystallization stop temperature) respectively during hot rolling, grain refining effect and (Ti-Nb-V) (C, N) precipitates which induced by massive strain increase the mechanical strength and exhibit good elongation. According to the experiment results, increasing TiN ratio by combined Ti-Nb-V addtion reaches the best mechanical performance. Besides, the annealing temperature is designed to be lower for thicker steel strips and for products with longitudinal direction mechanical property assurance, avoiding lower cold reduction may decrease the strength by larger ferrite grain size after annealing. In addition, Ca-Si addition during secondary refining improved the cleanliness by reducing the amount of elongated-type MnS precipitates. With the metallurgical design, the average YS, EL% are 440MPa, 23~25%, and toughness (TS x EL%) is also promoted, which lead to a steel grade that can absorb more impact energy and better resistance against crash. |
本系統中英文摘要資訊取自各篇刊載內容。