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退火溫度對430不銹鋼冷軋板組織和力學性能的影響

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

  • 摘要: 針對現場生產的430不銹鋼冷軋板,通過高溫連續退火實驗研究了退火溫度對材料顯微組織、強度、塑性以及各向異性性能的影響.通過實驗得到了合理的兩段式加熱連續退火工藝:選取中間溫度為600℃,加熱II段的加熱速率為2.3℃·s-1,最高加熱溫度為840℃.隨著退火溫度的升高,薄板的屈服強度和硬度呈明顯的兩階段降低趨勢,延伸率呈"S"型趨勢增加,平均塑性應變比基本保持不變(1.25左右),而軋制平面各向異性指數有一定的降低.針對430不銹鋼冷軋板分別建立了屈服強度與退火軟化率和延伸率之間的定量關系.

     

    Abstract: The effects of annealing temperature on the microstructure,strength,elongation and anisotropy properties of cold-rolled 430 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 two-stage 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.

     

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