Nb及二次淬火对Q＆P钢组织性能的影响.pdf

文档介绍：第34 卷第1 期 东 北 大 学 学 报 自 然 科 学 版 Vo l． 34，No． 1
2013 年 1 月 ity Shenyang 110819 China． Corresponding author
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ZHANG Jun E-mail zhangjun357@ 126． com
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Abstract Two kinds of steels 0. 19C-1. 52Si-1. 53Mn-0. 14Al-0. 048Nb and 0. 19C-1. 52Si-
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1. 48Mn-0. 15Al were treated by Q＆ P quenching and partitioning process． The effect of final
quenching on the microstructure and mechanical property of Q＆ P steels was studied． The results
showed that the addition of Nb has the effect of fine grain strengthening and precipitation
strengthening． The combination of elongation and tensile strength achieves 25 190 MPa·% ． And
the final quenching process increases the volume of martensite and greatly improves the tensile
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strength and yield strength of Q＆ P steels． Meanwhile this process decreases the total elongation
and work hardening index of the steels． The steels without final quenching process have the better
mechanical properties with high total e