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利用热模拟仪、金相、扫描电镜等显微结构观察及力学性能表征手段模拟研究了一种大线能量用钢粗晶热影响区域的组织微观特征,结果表明:模拟试样具有优秀的综合力学性能,其微观组织主要由晶内针状铁素体与贝氏体组成,复合夹杂物由分布在颗粒内部的Ti2O3、Zr O2、Al2O3和位于表层的Mn S组成。这种复合夹杂能够促进形成针状铁素体,进而细化组织,而位于原奥氏体晶界上的夹杂物则能够促进形成多边形铁素体。
The microstructures and microstructures of the coarse grain heat affected zone of a large wire energy steel were modeled by means of microstructure observation, metallographic observation and scanning electron microscopy (SEM) and mechanical properties characterization. The results show that the simulated samples have excellent comprehensiveness The microstructure is mainly composed of intragranular acicular ferrite and bainite. The composite inclusions consist of Ti2O3, ZrO2, Al2O3 distributed in the grain and MnS located in the surface layer. This composite inclusions can promote the formation of acicular ferrite, thereby refining the organization, while the inclusions located in the original austenite grain boundaries can promote the formation of polygonal ferrite.