富氮钒铌微合金化控冷工艺制备600MPa级抗震钢筋应用研究
发布时间：2018-09-14 18:08
【摘要】：采用拉力试验机、金相显微镜、透射电镜、X射线衍射仪、扫描电镜和冲击试验机对富氮钒铌微合金化控冷工艺制备的600MPa级抗震钢筋的力学性能、显微组织、析出相、断口形貌、冲击韧性及时效性进行了研究。结果表明:该钢筋具有良好的强韧性、抗震性及低应变时效性,力学性能优异。该钢的显微组织为铁素体+珠光体+少量细小贝氏体(含量5%~10%),组织配比及形态较好。该钢的铁素体基体、晶界及位错线上析出了大量尺寸2~20nm的细小弥散的V(CN)、Nb(CN)析出相,其析出相数量分别占总钒、总铌量的65%以上,起到了较好的沉淀强化及细化晶粒作用。该钢筋拉伸断口呈韧窝状,韧脆转变温度低于-30℃,具有较好的塑韧性和低温冲击韧性。
[Abstract]:The mechanical properties, microstructure, precipitation phase, fracture morphology of 600MPa grade anti-seismic steel bar prepared by means of tensile testing machine, metallographic microscope, transmission electron microscope (TEM), X-ray diffractometer (TEM), scanning electron microscope (SEM) and impact test machine (IPT) were studied. The impact toughness and time effect are studied. The results show that the steel bar has good strength and toughness, seismic resistance, low strain time effect and excellent mechanical properties. The microstructure of the steel is a small amount of fine ferrite pearlite bainite (5% 10%), and the microstructure and morphology of the steel are better. In the ferrite matrix, grain boundary and dislocation line, a large number of fine 2~20nm dispersed V (CN) NB (CN) precipitates have been precipitated. The precipitated phases account for more than 65% of the total vanadium and the total niobium content, which plays a better role in precipitation strengthening and grain refinement. The tensile fracture of the steel bar is dimple, and the ductile and brittle transition temperature is lower than -30 鈩，
本文编号：2243472
[Abstract]:The mechanical properties, microstructure, precipitation phase, fracture morphology of 600MPa grade anti-seismic steel bar prepared by means of tensile testing machine, metallographic microscope, transmission electron microscope (TEM), X-ray diffractometer (TEM), scanning electron microscope (SEM) and impact test machine (IPT) were studied. The impact toughness and time effect are studied. The results show that the steel bar has good strength and toughness, seismic resistance, low strain time effect and excellent mechanical properties. The microstructure of the steel is a small amount of fine ferrite pearlite bainite (5% 10%), and the microstructure and morphology of the steel are better. In the ferrite matrix, grain boundary and dislocation line, a large number of fine 2~20nm dispersed V (CN) NB (CN) precipitates have been precipitated. The precipitated phases account for more than 65% of the total vanadium and the total niobium content, which plays a better role in precipitation strengthening and grain refinement. The tensile fracture of the steel bar is dimple, and the ductile and brittle transition temperature is lower than -30 鈩，
本文编号：2243472
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