燕山大学学报2018，Vol.42Issue(2)：119-124,6.DOI:10.3969/j.issn.1007-791X.2018.02.004
Cr元素对桥梁耐候钢相变行为的影响
Effect of chromium element on bridge weathering steel phase transformation
摘要
Abstract
Bridge weathering steel can be exposed in the atmospheric environment,and the corrosion resistance is closely related to the rust layer structure formed on the steel surface. It is known that the bridge weathering steel application conforms to the new requirements of the resource saving and environment friendly society for the bridge construction. The dynamic continuous cooling transformation (CCT) diagrams of the two different bridge weathering steels are studied by utilizing thermal expansion and optical microscope in order to understand to the effect of Cr element and cooling rate on the phase transformation of bridge weathering steels. The results of study indicate that Cr element reduces the ferrite and bainite transformation temperature, but expands the bainite transformation region. Meanwhile, Cr element refines ferrite grain size and reduces ferrite volume fraction. With the cooling rate increased by 0.5 ℃/s to 20 ℃/s,the microstructures of bridge weathering steels are transformed from ferrite and pearlite into bainite,and the initialtemperature of ferrite transformation and final temperature of bainite transformation are lowed.关键词
桥梁耐候钢/相变/微观组织/热膨胀法Key words
bridge weathering steel/phase transformation/microstructure/thermal expansion分类
矿业与冶金引用本文复制引用
高新亮,肖瑶,韩毅,徐东,张兴中..Cr元素对桥梁耐候钢相变行为的影响[J].燕山大学学报,2018,42(2):119-124,6.基金项目
国家自然科学基金资助项目(51604241) （51604241）
河北省自然科学基金资助项目(E2016203395) （E2016203395）
秦皇岛市科技支撑计划项目(201602A014) （201602A014）
燕山大学青年教师自主研究课题(14LGB002) （14LGB002）
