有色金属科学与工程2024，Vol.15Issue(1)：51-57,7.DOI:10.13264/j.cnki.ysjskx.2024.01.007
热轧含钛低合金高强钢板断口分层机理研究
Mechanism research on layered fracture of hot rolling Ti-bearing HSLA plates
摘要
Abstract
The reason for layered fracture about hot rolling Ti-bearing HSLA plate was studied by optical microscopy,electron backscattering diffraction and transmission electron microscopy.The results show that MnS and large grained Ti(C,N)complex precipitation and aggregation are the main causes when the microstructure and effective grain size are normal.The tensile fracture shows a quasi-cleavage morphology with tearing edges and shallow dimples.During plastic deformation,the microcrack initiation is attributed to the crushing of Ti(C,N).The cracks are conducted along the thin-film-like MnS,eventually forming tearing edges at Mns and matrix interface.A large number of parallel-distributed MnS inclusions act together,leading to layered fracture morphology during stretching.By reducing the content of S and N,it can effectively reduce the number of two types of inclusions,eliminate the phenomenon of fracture stratification,and improve the plastic index.关键词
显微组织/拉伸断口/撕裂棱/准解理/夹杂物Key words
microstructure/tensile fracture/tearing edge/quasi-cleavage/inclusion分类
矿业与冶金引用本文复制引用
董欣欣,杨丽,唐勤,张丽颖,杨建辉..热轧含钛低合金高强钢板断口分层机理研究[J].有色金属科学与工程,2024,15(1):51-57,7.基金项目
河北省高等学校科学技术研究项目(ZC2021255) （ZC2021255）
