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30SiMnCrB5熱成形鋼的微觀組織和力學性能

Microstructure and mechanical properties of 30SiMnCrB5 hot stamping steel

  • 摘要: 為了提高熱成形鋼的綜合性能,設計了一種C-Si-Mn-Cr-B系熱成形鋼,采用熱膨脹儀測定并研究了30SiMnCrB5熱成形鋼的連續冷卻轉變曲線和相變規律.分析了經軋制、退火及熱成形模擬后鋼板的微觀組織形貌和力學性能,結合等密度線極圖的方法,判定了熱成形模擬后鋼板中馬氏體變體與母相的取向關系.30SiMnCrB5熱成形鋼具有較好的淬透性,臨界冷速為5℃·s-1,有效抑制了珠光體和貝氏體的形成,完全馬氏體組織的硬度可達600 HV以上.熱成形模擬后的微觀組織由板條馬氏體和殘余奧氏體構成,殘余奧氏體主要以薄膜狀分布在馬氏體板條間,質量分數為6%~8%,抗拉強度為1800 Mpa左右,總伸長率可達10%以上,強度和塑性的匹配較好.熱成形模擬后30SiMnCrB5熱成形鋼板中馬氏體變體與母相的取向關系更接近N-W關系,12種變體沒有都出現在原始奧氏體內.

     

    Abstract: A C-Si-Mn-Cr-B hot stamping steel was designed to improve its comprehensive properties. The continuous cooling transformation (CCT) curves and phase transformation rules of 30SiMnCrB5 hot stamping steel were measured and studied by thermal dilatometry. The microstructure morphology and mechanical properties of 30SiMnCrB5 steel sheet after rolling, annealing and hot stamping simulated were analyzed by scanning electron microscopy, transmission electron microscopy and tensile testing. The orientation relationship between martensite variants and parent phases in the hot-stamped steel sheet was determined by pole figure contouring. It is found that the critical cooling rate of 30SiMnCrB5 hot stamping steel is 5℃·s-1 with good hardenability which inhibits the formation of pearlite and bainite effectively. The hardness of full martensite is more than 600HV. The microstructure of the hot-stamped steel sheet is composed of lath martensite and retained austenite, which accounts for 6% to 8% and distributes between martensite laths by film. The strength and ductility of the hot-stamped steel sheet are matched well with a tensile strength of about 1800MPa and a total elongation up to 10%. The orientation relationship between martensite variants and parent phases in the hot-stamped steel sheet is closer to the N-W orientation relationship, which the 12 variants do not appear wholly in prior austenite.

     

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