【摘要】 本文研究了冷轧连退机组时效段等温温度对TRIP钢扩孔性的影响,通过在连退机组采用不同的等温时效工艺试验,发现随着时效段等温温度的降低有利于扩孔率的上升,从而出现延伸率下降的趋势;通过对试样进行金相、扫描电镜和透射电镜等微观组织分析表明,随着时效段等温温度温度下降,残余奥氏体的含量下降,块状残奥减少,导致δ下降,但是,薄膜状残奥增加,因此,λ增加。该试验和微观分析为通过等温退火工艺改善TBF钢延伸性能和扩孔性能指明了方向。更多还原

【Abstract】 This paper studies the influence of isothermal aging temperature on reaming of TRIP steel during cold- rolling continuous annealing period. Through different isothermal aging process tests in the continuous annealing line,it is found that the decreasing of isothermal aging temperature during aging section is in favor of rise of reaming rate,and a decline trend of elongation rate appears. Through microstructure analysis of metallurgical samples by scanning electron microscopy and transmission electron microscopy,it is showed that with the dropping down of aging section isothermal temperature,the content of retained austenite declines,massive retained austenite reduces,which makes δ decline,but the film-form retained austenite increase,therefore λ increase. The tests and microscopic analysis point out the direction of improving TBF steel elongation performance and reaming performance by isothermal annealing process.更多还原