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本试验在连轧16Mn稀土钢中进行。在11.4吨的上注锭内加入不同量的混合稀土金属。研究了钢中残留的稀土和硫含量之比与钢中夹杂物形态的变化,以及相应的拉伸、冲击、冷弯和汽车零件冲压结果之间的关系。分析讨论了夹杂物对韧性断裂过程的影响。试验表明:沿轧向显著延伸的硫化锰夹杂引起横向塑性和韧性大为降低,使性能呈现明显的方向性。加入稀土元素能显著地脱硫,特别是能使细长条硫化锰变为粒状稀土硫化物,从而使横向塑性和韧性显著提高,方向性得以消除。试验指出:钢中残留的稀土和硫含量之比是一个重要的参数,比值约为3时,细长条硫化锰全部变为粒状稀土硫化物,效果最佳。
This test is carried out in the continuous rolling 16Mn rare earth steel. In 11.4 tons on the injection of different amount of ingot mixed rare earth metal. The relationship between the ratio of rare earth to sulfur in steel and the change of inclusions in steel and the corresponding results of drawing, impact, cold bending and auto parts were studied. The influence of inclusions on the ductile fracture process is analyzed and discussed. The experiment shows that the transverse ductility and toughness are greatly reduced due to the inclusion of manganese sulfide which extends significantly along the rolling direction, and the performance is obviously directional. Addition of rare earth elements can be significantly desulfurization, in particular, can make slender manganese sulfide into granular rare earth sulfide, so that the lateral plasticity and toughness significantly improved, the direction of the elimination. The experiment indicates that the ratio of residual rare earth to sulfur content in steel is an important parameter. When the ratio is about 3, all the elongated manganese sulfide becomes granular rare earth sulfide, and the effect is the best.