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通过金相和TEM分析了X10管线钢在拉伸过程中的显微组织变化。结果表明,试验钢组织主要由马氏体、贝氏体及铁素体组成,各组织均匀分布;铁素体生长完整,边界清晰,板条状马氏体平行排列,长条状贝氏体位于铁素体间;马氏体与贝氏体板条间大角度取向差有利于试验钢塑性与疲劳强度的提高;位错堆积处的析出相呈弥散分布,这些析出相能提高钢材强度,同时阻止应变过程中析出导致的时效。
The microstructural changes of X10 pipeline steel during drawing were analyzed by metallography and TEM. The results show that the microstructure of the test steel is mainly composed of martensite, bainite and ferrite, with uniform distribution among all the structures. The ferrite growth is complete and the boundary is clear. The lath martensite is arranged in parallel and the long bainite Located in the ferrite; martensitic bainite and large angle between the slab is conducive to the test of plasticity and fatigue strength increased; dislocation deposition precipitates were dispersed, the precipitation phase can improve the strength of steel, While preventing the aging caused by the precipitation during the strain process.