新型热镀锌双相钢的合金成分对界面层和镀层结构的影响
Influence of Alloying Elements on Interfacial Layer-and Galvanized Layer-Structure of New Hot-dip Galvanized Dual-phase Steel
李沅沅 1梁健 1熊自柳 2苗斌 1田秀刚 3齐建军 4郑士建1
作者信息
- 1. 河北工业大学材料科学与工程学院 天津 300401
- 2. 河钢材料技术研究院 石家庄 050023
- 3. 唐山钢铁集团有限责任公司技术中心 唐山 063000
- 4. 河钢股份有限公司 石家庄 050023
- 折叠
摘要
用对粘方式制备热镀锌双相钢DP980样品,用TEM表征其截面,用TEM结合电子衍射和EDS表征其界面层结构和镀锌层结构并构建其空间关系.结果表明,与DP780在退火阶段合金元素Mn的外氧化不同,DP980主要发生内氧化和Cr元素与Mn元素的竞争性氧化,界面层中较少的MnO促进热镀锌过程中的Fe-Al反应而生成了连续致密的Fe2Al5抑制层,抑制了镀锌阶段的Fe-Zn反应而使DP980具有较好的热镀锌性能.同时,这种结构使弥散分布在镀锌层中的η-Zn基体生成Fe3Zn10纳米晶而避免生成有较大脆性Fe-Zn相的镀层结构,使DP980保持较好的力学性能.
Abstract
Hot-dip galvanized dual-phase steel DP980 samples were prepared by adhesive method,and their cross-sections were characterized by TEM.The interface layer structure and zinc coating struc-ture were characterized by TEM combined with SAED and EDS.Then spatial morphology and composi-tion distribution of the interfacial layer and galvanized layer was figured.The results indicated that unlike DP780,which mainly undergoes external oxidation of Mn during the annealing stage,DP980 mainly un-dergoes internal oxidation.Due to the presence of Cr,its oxidation competes with that of Mn.Less MnO in the interface layer may facilitate the Fe-Al reaction in the hot galvanizing process,forming a continuous and dense Fe2Al5 inhibiting layer,which can effectively inhibit the Fe-Zn reaction in the galvanizing stage.This is the main reason why DP980 has good hot dip galvanizing performance.In addition,this structure leads to the formation of Fe3Zn10 nanocrystals dispersed in the η-Zn matrix.This can avoid the formation of a galvanized layer structure containing large size of brittle Fe-Zn phase,which is beneficial for DP980 to maintain good mechanical properties.
关键词
材料表面与界面/镀锌双相钢/微观结构表征/选择性氧化/界面层结构/镀锌层结构Key words
surface and interface in the materials/galvanized dual-phase steel/microstructure char-acterization/selective oxidation/interface layer structure/galvanized layer structure引用本文复制引用
基金项目
国家自然科学基金(52101013)
河北省中央引导地方科技发展资金项目(226Z1012G)
河钢材料技术研究院合作研究项目(HG2021104)
河钢材料技术研究院合作研究项目(HG2021123)
出版年
2024
NETL
NSTL
万方数据