摘要
用光学显微镜、扫描电镜和体视显微镜对HB450级耐磨钢板延迟开裂断口的宏微观形貌、夹杂物分布和显微组织进行了观察分析。结果表明,切割工艺不当导致了边缘处存在过渡带组织,在夹杂物、残余应力和外部环境的综合作用下产生裂纹并发生扩展。裂纹产生在过渡带组织内（粗大的铁素体和马氏体）的夹杂物附近,最初沿着轧面扩展,随后转到侧面上,最终在轧板厚度方向上贯穿,在断口边缘处出现台阶。
The fracture surfaces, distribution of non-metallic inclusions and microstructure of delayed cracking of a HB450 abrasion resistant steel plate were analyzed by means of optical microscope （ OM ） , scanning electron microscopy （SEM） and stereoscopic microscopy. The results show that the improper cutting process leads to the transition zone microstrncture at the cutting edge, and cracks occur and propagate under the combined effects of the non-metallic inclusions, residual stress and external environment. The cracks originate near the non-metallic inclusions in the mierostrneture of the transition zone （coarse ferrite and martensite）. At the beginning, the crack initiates along the rolling surface, then turns to the side surface, and finally runs through the whole rolled plate. In addition, a step aooears at the edge of the fracture.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2018年第1期84-89,共6页
Transactions of Materials and Heat Treatment
基金
国家重点研发计划“重点基础材料技术提升与产业化”重点专项“煤炭采运用高耐磨性钢板及应用”(2017YFB0305100)
