首页|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

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

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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.
Influence of Alloying Elements on Interfacial Layer-and Galvanized Layer-Structure of New Hot-dip Galvanized Dual-phase Steel
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.

surface and interface in the materialsgalvanized dual-phase steelmicrostructure char-acterizationselective oxidationinterface layer structuregalvanized layer structure

李沅沅、梁健、熊自柳、苗斌、田秀刚、齐建军、郑士建

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河北工业大学材料科学与工程学院 天津 300401

河钢材料技术研究院 石家庄 050023

唐山钢铁集团有限责任公司技术中心 唐山 063000

河钢股份有限公司 石家庄 050023

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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

国家自然科学基金河北省中央引导地方科技发展资金项目河钢材料技术研究院合作研究项目河钢材料技术研究院合作研究项目

52101013226Z1012GHG2021104HG2021123

2024

10.11901/1005.3093.2023.424

材料研究学报
国家自然科学基金委员会 中国材料研究学会

材料研究学报

CSTPCD北大核心
影响因子：0.605
ISSN：1005-3093
年,卷(期)：2024.38(6)