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将双辊铸轧Cr12钢薄板于1 000℃固溶,再采用炉冷和水淬两种方式冷却至室温,分别获得了多边形铁素体和板条马氏体两种组织,再经过相同冷轧和退火工艺,得到了两种成品板。经拉伸试验测定,水淬板的深冲性和抗皱性均强于炉冷板。组织分析发现:热处理后,水淬板内马氏体板块明显细小于炉冷板内铁素体晶粒;冷轧后,水淬板内板块间界演变为较高密度形变晶界;这提高了其退火过程中再结晶晶粒形核密度、细化了退火组织、抑制了晶粒簇形成,使水淬板起皱程度弱于炉冷板。织构分析发现:由于基体塑性变形能力较强,水淬板冷轧后得到的α织构强度更高且峰值距{111}<110>更近;退火后,其得到的γ织构强度更高且沿γ取向线分布更均匀,而炉冷板内还有高斯织构形成,于是水淬板获得了较高rm值和较低Δr值。
The two-roll cast Cr12 steel sheet was solid-solutioned at 1000 ° C and cooled to room temperature by furnace cooling and water quenching. Two kinds of ferrite and lath martensite were obtained respectively, Rolling and annealing process, have been two kinds of finished board. Tensile test determination, water quenching board deep drawability and wrinkle resistance are stronger than the furnace cold plate. The microstructure analysis shows that the martensite plate in the water quenched plate is obviously smaller than the ferrite grains in the cold plate after heat treatment. After the cold rolling, the boundary between the plates in the water quenched plate evolves into the higher density deformed grain boundary. The nucleation density of recrystallized grains during the annealing process was refined, the annealed microstructure was refined, the formation of grain clusters was restrained, and the degree of wrinkling of water-quenched plates was weaker than that of furnace-cooled plates. The texture analysis shows that the texture strength of the water-quenched board after cold-rolling is higher and its peak value is closer to {111} <110> due to the stronger plastic deformation ability of the substrate. After annealing, the obtained γ-textural strength is more High and along the γ-oriented line distribution more uniform, and the furnace cold plate also has Gaussian texture formation, so water quenching board to obtain a higher rm value and lower Δr value.