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对540MPa级铁素体/贝氏体双相钢的组织性能进行分析研究。结果表明,试验钢的显微组织为85%左右的铁素体加上15%左右的贝氏体;铁素体晶粒尺寸细小,基体中有较高的位错密度和大量细小弥散的析出物;贝氏体在铁素体基体上分布均匀,以板条状为主,板条间分布有较多碳化物颗粒。通过合适的成分设计和控轧控冷手段获得的铁素体/贝氏体双相钢组织形态,可较好地保证材料所需的强度-拉伸凸缘性能匹配。 相似文献
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为了研究Si和Nb对高强热轧高扩孔钢板显微组织、力学性能和扩孔性能的影响,在CSP连轧线上进行了3种成分试验钢的热轧试制,并对试验钢在扩孔过程中裂纹的形成和扩展行为进行了分析.研究表明:3种成分热轧钢板的显微组织均由铁素体和贝氏体组成,钢板的抗拉强度均高于610 MPa,伸长率大于24.5%,扩孔率高于104%;Si含量的增加,提高了组织中铁素体的含量,钢板的强度、伸长率和扩孔率得到提高;Nb含量的增加,细化了钢板的组织,钢板的强度和扩孔率增加明显,伸长率变化不大;试验钢在扩孔过程中裂纹主要沿铁素体和贝氏体的晶界处扩展,部分裂纹穿过铁素体晶粒. 相似文献
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钛对汽车车轮用钢组织和性能的影响 总被引:6,自引:1,他引:5
本文通过相分析,金相组织观察、拉力和扩孔实验等手段分析了钛在汽车车轮用钢中的分布状态及其对金相组织、夹杂物、力学性能和延伸凸缘性能的影响。实验结果表明,钛除起细化晶粒、弥散强化作用外,又可与硫结合成Ti4C2S2夹杂物,改变钢中长条状MnS夹杂物形态,提高钢的延伸凸缘性能。当钢中Ti/S比为2~3时,延伸凸缘性能的改善最明显。对硫含量较高(0.025%~0.035%)的钢,添加0.05%~0.11 相似文献
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Yeol-Rae Cho Jin-Hwan Chung Hwang-Hoe Ku In-Bae Kim 《Metals and Materials International》1999,5(6):571-578
The effect of cooling on the mechanical properties of hot-rolled high strength steels was investigated in order to improve
the stretch-flangeability of conventional TS 590 MPa grade for the automotive parts through laboratory simulation and mill-scale
production. The low temperature coiling method using a 3-step controlled cooling pattern after hot rolling was very effective
for producing Nb-bearing high strength steel with high stretch- flangeability. It was suggested that the suppressed precipitation
of grain boundary cementites and the decreased hardness difference between the ferrite matrix and bainite phases cause the
excellent stretch-flangeability of ferrite-bainite duplex microstructure steel. Therefore, the formation and propagation of
microcracks were suppressed relative to conventional HSLA steel with the ferrite and pearlite microstructure. In addition,
the elongation improved compared with that of hot-rolled steel sheets using the conventional early cooling pattern because
the volume fraction of polygonal ferrite increased. 相似文献
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