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汽车车轴用YF45MnV钢要求极低的总氧含量和适宜的硫含量,使得对其中硫化物尺寸和形态的控制,用传统的方法均无法有效的实现。本文提出对YF45MnV钢连铸坯等温热处理从而控制钢中硫化物的概念,并在实验室进行了详细研究。首先用thermo-calc热力学软件计算出理想条件下,YF45MnV钢中硫化锰大量析出温度为1416℃;在此基础上,进一步研究了不同热制度对钢中硫化物尺寸的影响;最后,为解决长时间保温处理造成的奥氏体的粗化问题,实验采用gleeble-1500热模拟实验机对等温处理后试样进行压缩实验。研究表明,合适的热处理参数能够将YF45MnV钢连铸坯中硫化物控制为较小尺寸和理想形态(纺锤状和近球形);等温处理后粗大的奥氏体,通过后续变形过程可以实现晶粒细化。
YF45MnV steel for automobile axles requires extremely low total oxygen content and suitable sulfur content, so that the control of the size and shape of sulfides therein can not be effectively achieved by conventional methods. In this paper, the concept of isothermal heat treatment of YF45MnV steel slab to control sulfide in steel was proposed and studied in detail in the laboratory. First, using thermo-calc thermodynamic software to calculate the ideal conditions, YF45MnV steel manganese sulfide precipitation temperature of 1416 ℃; on this basis, further study of different thermal regime on the sulfide size of the steel; Finally, in order to solve the long Time heat treatment caused by coarsening of austenite, the experiment using gleeble-1500 thermal simulation test machine after isothermal treatment of the sample compression test. The results show that suitable heat treatment parameters can control the sulfide content in the YF45MnV steel slab to a smaller size and the ideal shape (spindle and nearly spherical); coarse austenite after isothermal treatment can be achieved by the subsequent deformation process Refine.