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通过显微组织观察及力学性能测试研究了经不同温度卷取后T-4CA高硬度镀锡板不同状态下的组织和力学行为。结果表明,镀锡板的时效性不仅和固溶间隙原子有关,还和镀锡基板中的渗碳体析出相的分布以及铁素体晶粒尺寸有密切关系。低温卷取时,冷轧退火时铁素体晶粒尺寸细小且渗碳体析出相呈细小的点链状分布,这样的组织和析出相分布使得软熔后的镀锡板在拉伸变形过程中屈服点延伸率较大;高温卷取时,冷轧退火板无论是铁素体基体还是渗碳体析出相都较粗大,使镀锡板在软熔后的拉伸变形过程屈服点延伸率大幅降低,抗时效性也显著提高。此外,通过对比分析镀锡板在退火、平整和镀锡后的屈服强度变化,发现镀锡后屈服强度的提高不仅与Cottrell气团钉扎位错有关,还与位错之间的交互作用有关。
The microstructure and mechanical properties of T-4CA high-hardness tinplate after coiling at different temperatures were investigated by microstructure observation and mechanical properties test. The results show that the timeliness of tin plate is not only related to the solution interstitial atoms, but also to the distribution of cementite precipitates and the ferrite grain size in the tin-plated substrate. When cold rolling, the grain size of ferrite in the cold rolling and annealing is small and the precipitated phase of cementite is in a small dotted chain distribution. The distribution of the microstructure and the precipitated phase makes the reflowed tin plate in the process of tensile deformation The elongation at yield point is larger; when the coiling temperature is high, both the ferrite matrix and the cementite precipitation phase are coarser in the cold rolled annealed sheet, so that the elongation at yield point of the tinplate during the tensile deformation after reflow Dramatically reduce, anti-aging is also significantly improved. In addition, by comparing the yield strength of tinplate after annealing, flattening and tinning, it is found that the increase of yield strength after tin plating is not only related to Cottrell pinning dislocation, but also to the interaction between dislocations.