工程科学学报2016，Vol.38Issue(3)：357-363,7.DOI:10.13374/j.issn2095-9389.2016.03.009
热轧态与回火态 AH80 DB 低碳贝氏体钢组织与冲击韧性
Microstructure and impact toughness of hot rolled and tempered low carbon bainitic steel AH80 DB
摘要
Abstract
The microstructure, martensite/austenite ( M/A) islands, precipitated phases, high-angle grain boundaries and effec-tive grain size of hot rolled and tempered low carbon bainitic steel AH80DB were studied by scanning electron microscopy (SEM), transmission electron microscopy ( TEM) and electron back-scattered diffraction ( EBSD) . The reason for the improvement in impact toughness of the low carbon bainitic steel after tempering was discovered. The results show that the microstructures of both the samples mainly consist of lath bainite, granular bainite and acicular ferrite. There is more acicular ferrite in the tempered steel. Coarse M/A islands are found in the hot rolled steel and its distribution is directional, the ratio of large-angle grain boundaries is 17. 33%, and the average effective grain size is 3. 57μm. Nevertheless, the size of M/A islands decreases after tempering. Besides, the ratio of large-angle grain boundaries increases by 3. 43% and the average effective grain size decreases by 0. 56μm after tempering. The precipita-ted phase of the hot rolled steel is ( Nb,Ti) C with the size of 50-150 nm, while much small and spherical precipitates with the size of about 10 nm appear after tempering.关键词
低碳钢/贝氏体/冲击韧性/显微组织/析出相Key words
low carbon steel/bainite/impact toughness/microstructure/precipitation分类
矿业与冶金引用本文复制引用
赵雷超,孙斌堂,黄运华,张施琦,丁一,闫小琴,张跃..热轧态与回火态 AH80 DB 低碳贝氏体钢组织与冲击韧性[J].工程科学学报,2016,38(3):357-363,7.基金项目
教育部创新团队和新世纪人才计划资助项目(IRT1106) （IRT1106）
高等学校学科创新引智计划资助项目(B14003) （B14003）
中央高校基本科研业务费资助项目(FRF-As-13-001A) （FRF-As-13-001A）
