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本文研究了组织分布不同的双向钢低温回火前后的拉伸行为。结果表明,短针状弥散分布的双相钢综合性能最好,马氏体呈带状分布时,强度高,延性差,这是由于组织分布的不均匀直接导致应变分布的不均匀,使应变集中区域产生早期破断所致。200℃回火后,不同形态分布的双相钢强度明显下降,延伸率大大改善,这主要是由于碳化物的聚集粗化和铁素体的结果。同时加工硬化能力的减弱则是马氏体的弱化削弱了对位错运动障碍所造成的。
In this paper, the tensile behavior of two-way steel with different microstructures distribution before and after low-temperature tempering was studied. The results show that the short acicular distribution of dual phase steel has the best comprehensive performance, martensite distribution is zonal, high strength, poor ductility, which is due to uneven distribution of tissue directly leads to uneven distribution of strain, strain Concentrated area resulting from early rupture. After tempering at 200 ℃, the strength of the dual phase steels with different morphological distribution decreased obviously, and the elongation improved greatly, which was mainly attributed to the coarsening of carbide and the ferrite. At the same time, the weakening of the work-hardening ability is that the weakening of the martensite weakened the dislocation movement caused by obstacles.