退火温度对430不锈钢冷轧板组织和力学性能的影响

Effect of annealing temperature on the microstructure and mechanical properties of cold-rolled 430 stainless steel

针对现场生产的430不锈钢冷轧板,通过高温连续退火实验研究了退火温度对材料显微组织、强度、塑性以及各向异性性能的影响.通过实验得到了合理的两段式加热连续退火工艺:选取中间温度为600℃,加热II段的加热速率为2.3℃·s-1,最高加热温度为840℃.随着退火温度的升高,薄板的屈服强度和硬度呈明显的两阶段降低趋势,延伸率呈"S"型趋势增加,平均塑性应变比基本保持不变(1.25左右),而轧制平面各向异性指数有一定的降低.针对430不锈钢冷轧板分别建立了屈服强度与退火软化率和延伸率之间的定量关系.

The effects of annealing temperature on the microstructure,strength,elongation and anisotropy properties of cold-rolled430 stainless steel were studied by continuous annealing experiment. An available double-heating section annealing process is obtained for the cold-rolled steel as the following： the intermediate and the maximum annealing temperature are 600 and 840 ℃,respectively,and the heating rate of the second heating section is maintained at 2. 3 ℃·s^-1. As continuous annealing proceeds,the mechanical properties of the strip have great changes： when the annealing temperature rises,the yield strength and hardness decrease by a twostage trend,the elongation sigmoidally increases,the mean Lankford value remains at a level of approximately 1. 25,and the variation of Lankford value on the rolling plane has apparent decrease. Quantitative relationships between yield strength and softening fraction and between yield strength and elongation are determined for the cold-rolled steel.