论文部分内容阅读
低碳铁素体加马氏体双相钢的强度和塑性取决于马氏体的数量和分布,这与亚温区加热过程中奥氏体形成的特点有关。由于奥氏体的形成是在高温下进行,速度快,难于直接获得有关形核的信息。本文研究低碳钢中奥氏体形成的部位,以及预先冷轧的影响。试验用低碳1.5Mn钢,其化学成分为(wt-％):C 0.08,Mn 1.45,si 0.21,Al 0.045,N 0.005。经高频感应电炉熔炼成45kg的钢锭后,热轧成2.5mm厚的板材。在真空炉中经过1200℃均匀化退火24h。然后,在盐炉中900℃加热15min后空冷,获得铁素体加珠光体型的正火原始组织。另将一部分正火的坯料进行厚度压下量
The strength and ductility of the low-carbon ferritic plus martensite duplex steel depend on the amount and distribution of martensite, which is related to the formation of austenite during sub-temperature heating. Since the formation of austenite is carried out at high temperatures, fast, it is difficult to directly obtain information about nucleation. This paper studies the formation of austenite in mild steel and the effect of pre-cold rolling. The test uses low carbon 1.5Mn steel, its chemical composition (wt -%): C 0.08, Mn 1.45, si 0.21, Al 0.045, N 0.005. After high-frequency induction furnace melted into 45kg ingot, hot rolled into 2.5mm thick sheet. After annealing in a vacuum furnace at 1200 ℃ 24h. Then, it was air-cooled by heating in a salt furnace at 900 ° C for 15 minutes to obtain a ferrite plus pearlite-type normalized primary structure. Another part of the normalization of the blank thickness reduction