45CrNiSiMnMoVA超高强度钢的强韧化热处理工艺  

Strengthening and toughening heat treatment process of ultra high strength 45CrNiSiMnMoVA steel

作　　者：毕红霞[1] 唐明华[1] 周勇[2] 任芝兰[1] BI HONG-xia;TANG Ming-hua;ZHOU Yong;REN Zhi-lan(Institute of Advanced Manufacturing Technology of Hunan Institute Technology,Hengyang 421002,China;Technology Center of Hengyang Valin Steel Tube Group Co Ltd,Hengyang 421001,China)

机构地区：[1]湖南工学院先进制造技术研究所,湖南衡阳421002 [2]衡阳华菱钢管有限公司技术中心,湖南衡阳421001

出　　处：《材料热处理学报》2020年第10期60-65,共6页Transactions of Materials and Heat Treatment

基　　金：湖南省衡阳市产学研专项资金资助项目(2018KJ177)。

摘　　要：采用力学性能测试、扫描电镜(SEM)、透射电镜(TEM)等研究了不同热处理工艺对新型低合金超高强度45CrNiSiMnMoVA钢的微观组织和力学性能的影响。结果表明:随着奥氏体化温度的不断升高,试验钢的力学性能逐渐提高,并在920℃时达到峰值,达到峰值之后才会缓慢下降;在320~380℃回火后,试验钢的强韧性随回火温度变化的幅度非常小,当回火温度为350℃时,试验钢具有强度、塑性和韧性相配合的最优综合力学性能。分析认为,试验钢的强韧化机理与以"多相、亚稳和多尺度"为核心思想的M^3组织性能调控理论十分吻合。Effects of different heat treatment processes on microstructure and mechanical properties of new low alloy ultra-high strength 45 CrNiSiMnMoVA steel were studied by means of mechanical properties test, scanning electron microscopy(SEM), and transmission electron microscopy(TEM). The results show that the mechanical properties of the tested steel increase gradually with the increase of austenitizing temperature, and reach the peak at 920 ℃, and then decrease slowly. After tempering at 320-380 ℃, the strength and toughness of the tested steel vary very little with the tempering temperature. When the tempering temperature is 350 ℃, the tested steel has the optimal comprehensive mechanical properties of strength, plasticity and toughness. According to the analysis, the strengthening and toughening mechanism of the tested steel is in good agreement with the theory of M^3 structure performance regulation based on "multiphase, metastable and multiscale ".

关 键 词：45CrNiSiMnMoVA钢 马氏体/下贝氏体复相组织 组织与性能 

分 类 号：TG142.3[一般工业技术—材料科学与工程]