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在 3 3× 10 0 s- 1 ～ 3 3× 10 - 5s- 1 范围内连续调整拉伸速率 ,测定了韧性、介韧性、脆性球墨铸铁的σb,δ及Ψ值。结果发现 ,随拉伸速率逐渐减小 ,上述性能指标先是逐渐增大 ,至某一最大值后又逐渐减小 ,所得曲线呈峰状 ,但三种球铁峰值及峰的形状有所不同。作为脆性金属材料的中硅球铁 (～ 5 %Si) ,在低拉伸速率时呈现出一定塑性 ,表明这类材料在慢拉伸条件下 ,其塑性尚有一定潜力。初步研究表明 ,慢拉伸时球铁的变形机制发生改变。
The tensile rate was continuously adjusted in the range of 3 3 × 10 0 s -1 ~ 3 3 × 10 -5 s -1 and the σb, δ and Ψ values of ductile, ductile and brittle ductile iron were measured. The results showed that with the decreasing of the stretching rate, the above performance index first increased gradually, and then decreased to a certain maximum value. The obtained curve showed a peak, but the shapes of the three kinds of ductile iron peak and peak were different. Ductile iron (~ 5% Si), a brittle metallic material, exhibits some plasticity at low draw rates, indicating that there is some potential for this type of material to be ductile under slow tension. Preliminary studies have shown that the deformation mechanism of ductile iron changes slowly during slow drawing.