摘要
在实验室试制了400、460MPa级耐候钢,结果表明,试验钢屈服强度分别达到450、550MPa,抗拉强度分别达到545、615MPa;400MPa级耐候钢的显微组织以铁素体为主,460MPa级的以粒状贝氏体为主;400MPa级的析出物主要是CuS2和TiN,主要强化机制是细晶强化、析出强化;460MPa级的析出物主要是CuS2和(NbTi)CN,其主要强化机制是细晶强化、析出强化及相变强化。采用电子背散射EBSD技术分析了其晶体学取向,其晶粒间取向主要是大角度晶界。
The 400 and 460 MPa weathering steel were rolled by pilot mill. The yield strength and the tensile strength of the 400 MPa steel reached to 450 and 545 MPa,respectively, and those of 460 MPa steel reached 550 and 615 MPa. The microstructure of 400 MPa steel mainly consists of ferrite, while that of the 460 MPa steel consists of granular bainite. The morphology and size of precipitates in hot rolled specimens were observed by H-800 transmission electron microscopy. The precipitates of 400 MPa steel are CuS2 and TiN, while those of 460 MPa are CuS2 and （ NbTi ） CN. The key mechanisms for strengthening of 400 MPa steel are precipitation and refinement strengthening; those of 460 MPa steel are precipitation, refinement and transformation strengthening. The crystallographic orientation was analyzed and observed by EBSD. The orientations among neighboring grains are high angle grain boundaries.
出处
《钢铁》
CAS
CSCD
北大核心
2005年第7期60-63,共4页
Iron and Steel
基金
国家自然科学基金资助项目(50334010)
关键词
析出
金相组织
高强耐候钢
晶粒取向
precipitate
mierostrueture
high strength weathering steel
grain orientation
