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《Iron & Steel》 2006-09
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Effect of Temper on Microstructure and Mechanical Properties of Acicular Ferrite Steel

KANG Jun-yan,YU Wei,CHEN Yin-li(National Engineering Research Center for Advanced Rolling Technology,University of Science and Technology Beijing,Beijing 100083,China)  
The microstructure and properties of acicular ferrite steel tempered from 540 ℃ to 630 ℃ were studied.Compared with the steel as rolled,the yield strength of steel tempered at 630 ℃ was increased by 75 MPa, the mean elongation was decreased by 1.9% and the mean impact toughness was almost unchanged.By comparison of the microstructure and precipitates before and after tempering,it can be concluded that in tempered steel the intragranular dislocation density is lower and part of plate-like subgrains is disappeared,but the mean size of precipitates is smaller.The mean size of precipitates becomes bigger with the raise of tempering temperature.After tempering at 630 ℃,the distribution frequency(f(D)) of precipitates in the range of 1~10 nm is increased by two to three times,the amount of precipitated niobium and vanadium was increased by 166.9% and 584.6% respectively.It is considered that the enhancement of strength is mainly due to the increase in number of small precipitates and disappearance of part of plate-like subgrains.
【CateGory Index】: TG113
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