论文部分内容阅读
采用热模拟和显微组织分析方法,研究了冷却速率、变形温度、变形量等轧制工艺参数对一种X70级微合金管线钢组织及马氏体/奥氏体(M/A)小岛的影响.结果表明:增大冷速、降低变形温度均可使组织细化,组织中多边形铁素体减少,针状铁素体增多;同时,在不同的控轧条件下,会形成一定的M/A小岛,变形温度对M/A小岛影响不大,而适当提高冷速和增大变形量将减少小岛相对量,并使其细小而弥散分布于基体;合理控制形变参数及冷速可获得较理想的显微组织与M/A小岛的配合,提高材料性能.
The microstructure and microstructure of X70 grade microalloyed pipeline steel were studied by means of thermal simulation and microstructure analysis. The effects of cooling rate, deformation temperature and deformation on the microstructures of X70 microalloyed pipeline steel and martensite / austenite (M / A) The results show that: increasing the cooling rate and decreasing the deformation temperature can refine the microstructure, decrease the polygonal ferrite in the structure and increase the acicular ferrite; at the same time, under different controlled rolling and rolling conditions, a certain amount of M / A islets, the temperature of deformation has little effect on the M / A islets, and properly increasing the cooling rate and increasing the amount of deformation will reduce the relative amount of the islets and make them fine and dispersed in the matrix; Cooling rate can be more ideal microstructure and M / A island with the material to improve performance.