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针对两种不同成分的700 MPa级超高强度耐候钢,利用金相显微镜、扫描电镜及透射电镜进行了组织观察,检验了硬度,研究了终冷温度在550~680℃之间变化对试验钢组织和性能的影响。结果表明,在其它工艺相同的情况下,终冷温度控制在约600℃,两种成分的试验钢均可得到良好的组织和性能;随着终冷温度的降低,钢的显微组织由多边形铁素体和少量珠光体转变为铁素体和贝氏体为主,铁素体基体上均匀分布着细小析出相;添加Mo的试验钢贝氏体含量高;硬度呈现先升高后降低的趋势。
For 700 MPa super high strength weathering steels with two different compositions, the microstructure was observed by metallographic microscope, scanning electron microscope and transmission electron microscope, and the hardness was tested. The effect of the final cooling temperature on the test steel The impact of organization and performance. The results show that under the same conditions of other processes, the final cooling temperature is controlled at about 600 ℃. Both of the two components of the test steel have good microstructure and properties. With the decrease of the final cooling temperature, the microstructure of the steel consists of polygons Ferrite and a small amount of pearlite into ferrite and bainite, ferrite matrix uniformly distributed fine precipitates; Add Mo test steel bainite content is high; hardness showed first and then decreased trend.