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CSP低碳钢的晶粒细化与强韧化 被引量:29

GRAIN REFINEMENT AND STRENGTHENING OF LOW GARBON STEEL BY CSP TECHNOLOGY
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摘要 生产统计表明:成分与Q195接近的CSP工艺低碳钢ZJ330其屈服强度成倍提高,可达到310-410MPa,同时延伸率达到30%-45%.本文对CSP工艺生产的低碳钢板以及同一块钢坯经不同阶段轧制冷却后的试样进行了研究,应用TEM+XEDS技术在薄晶体和萃取复型试样中观察到沿晶界和亚晶界析出的许多细小氧化物和硫化物粒子.研究表明:纳米级氧化物与硫化物沉淀粒子可阻碍晶粒长大,而微量杂质元素在晶界偏聚可以通过阻碍晶界迁移和降低γ-α转变温度而起到细化晶粒的作用,由沉淀和偏聚导致的有效晶粒尺寸减小是这类钢板强度与塑性同时大幅提高的重要原因之一. The experimental results showed that yield strength of the low carbon steel ZJ330 produced by CSP (compact strip production) technology is in the range of 310-410 MPa with elongation ranged from 30% to 45%. The composition of ZJ330 is similar as that of Q195 steel. Much works have been carried out on this CSP low carbon steel. Different rolling pass (one pass to six pass) specimens of the same rolling piece were examined by TEM and XEDS methods. Large number of fine oxide and sulfide precipitates along the grain boundaries and subgrain boundaries have been observed in extract replica specimens and thin foil samples. It is expected that effective grain refinement resulted from these nano-scaled particles and grain boundary segregation of impurity elements played a key role for greatly improving mechanical properties of this CSP low carbon steel.
出处 《金属学报》 SCIE EI CAS CSCD 北大核心 2002年第6期647-651,共5页 Acta Metallurgica Sinica
基金 国家重点基础研究发展规划G1998061500资助项目
关键词 薄板坯连铸连轧碳钢 显微组织 晶粒细化 第二相沉淀 晶界偏聚 CSP low carbon steel microstructure grain refinement precipitation grain boundary segregation
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