管线钢冲击断口的显微分析  

Fractographic Analysis of Impact Fracture Surface for Pipeline Steels

作　　者：郭晓静 苏崇涛 GUO Xiaojing;SU Chongtao(The Technical Institute of Benxi Iron&.Steel(Group)Co.,Benxi 117000,China)

机构地区：[1]本溪钢铁(集团)技术研究院,本溪117000

出　　处：《理化检验（物理分册）》2021年第12期44-48,共5页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：为了解材料性能及显微组织分布如何对冲击吸收能量产生影响,对不同牌号的管线钢试样进行了摆锤冲击试验,通过光学显微镜、扫描电镜对冲击断口处夹杂物在冲击过程中的扩展情况、组织形变及二次裂纹的扩展情况等进行了分析。结果表明:冲击吸收能量与材料所能承受的最大拉应力和材料均匀塑性形变能力关系更为密切;球状夹杂物在冲击过程中形成裂纹并扩展的能力较弱;管线钢中准多边形铁素体对裂纹扩张有较好的阻碍效果。In order to search how the material properties and microstructure distribution affect the impact absorption energy, pendulum impact tests were carried out on pipeline steel samples of different grades. The propagation of inclusions, microstructure deformation and secondary crack propagation at the impact fracture surface during impact were analyzed by optical microscope and scanning electron microscope. The results show that the impact absorption energy was more closely related to the maximum tensile stress and the ability of uniform plastic deformation. The ability of the spherical inclusions to form cracks and expand during impact was weak. The quasi-polygonal ferrite in the pipeline steels has good blocking effect on crack propagation.

关 键 词：管线钢 非金属夹杂物 球状夹杂物 冲击吸收能量 准多边形铁素体 

分 类 号：TG115[金属学及工艺—物理冶金]