奥氏体化温度和保温时间对B1500HS板热镀锌层组织及力学性能的影响

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中图分类号：TG142.1 文献标志码：B DOI：10.19710/J.cnki.1003-8817.20250252

Effect of Austenitizing Temperature and Holding Time on the Microstructure and Mechanical Properties of Hot-Dip Galvanized Layers in B1500HS Plates

Fan Liangwei （ShangHai Automobile Group Co.，Ltd.Passenger Vehicle Branch，Shanghai 201899）

Abstract：Thisstudy investigates themicrostructural evolution lawsof hot-dipgalvanized（GI）layerson industrially produced B15oMPa-grade steel plates during austenitization，aswellastheir influence on mechanical properties，through SEM + EDS analysis combined with uniaxial tensile tests under heating conditions ranging from 88 °C to 93 ℃ and holding times between min to min：The GI coating primarily consists of Γ -phase （ Fe3Zn10 and α -Zn （Fe）-phase; with increasing holding time from min to min，the proportion of Γ -phase decreases progressively until it is completely replaced by a single α -Zn（Fe）-phase at longer durations; Prolonged exposure at higher temperatures leads tooxidation membranecoverageon thesurface layer，whereMnelementsaccumulatepreferentiallywithin the outermostoxide layer; Uniaxial tensiletestresults indicate that whileultimate tensile strengthvariesminimalyacross diffrent austenitization parameters，optimal comprehensive mechanical performance characterized bya yield strength o （204号 =1 566MPa and total elongation A=6.5% is achieved when heated at 900°C for exactly 3 minutes.These findings demonstrate that judiciousselectionof austenitizationparameterscan effectively balance corrosionresistance with mechanical processability in GI-coated steels.

Keywords：Hotformingplate，Hot-dipgalvanizing，Austenitizing，Microstructure，Tensileproperty

1前言

作为实现车身轻量化的关键材料，热成形钢因其优异性能受到广泛关注，其应用范围已从 1500MPa 级扩展至 2000MPa 级产品。（剩余7543字）