【摘要】：設(shè)計了一種低碳含鎳DP鋼,采用Gleeble-3500測試了CCT曲線,用金相顯微鏡觀察了微觀組織。依據(jù)CCT曲線進行了退火工藝設(shè)計,采用五因素四水平正交試驗方法,結(jié)合力學(xué)性能測試、SEM組織觀察和彩色金相等分析手段,探討分析了不同工藝參數(shù)對DP鋼組織性能的影響。試驗結(jié)果表明,試驗材料的A_(c1)為712℃,A_(c3)為928℃;連續(xù)冷卻過程中,出現(xiàn)貝氏體相變的臨界冷速為5℃/s,馬氏體相變的臨界冷速為30℃/s;退火溫度對屈強比和伸長率影響最大,而退火時間對n值的影響最大,整體考慮3個性能指標,得出最合理的退火工藝為840℃退火210 s,緩慢冷卻至740℃后快速淬火至350℃時效240 s。
[Abstract]:A low carbon nickel containing DP steel was designed. The CCT curve was measured by Gleeble-3500 and the microstructure was observed by metallographic microscope. The annealing process was designed according to the CCT curve. The effects of different process parameters on the microstructure and properties of DP steel were analyzed by means of five factors and four levels orthogonal test, SEM microstructure observation and color metallography analysis. The results show that the critical cooling rate of bainite transformation is 5 鈩，

本文編號：2135362