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高強度低碳貝氏體鋼工藝和組織對性能的影響

Effects of process parameters and intermediate transformation structure on mechanical properties of a high strength low carbon bainitic steel

  • 摘要: 通過對Mn-Cu-Nb-B系列低碳貝氏體鋼的等溫轉變及連續冷卻轉變組織的研究,發現該系列微合金鋼在500~700℃可發生多種類型中溫組織轉變.冷卻速度和終冷溫度對最終組織類型和性能有很大影響,終冷溫度控制在630℃,可得到準多邊形鐵素體、粒狀貝氏體和細小M/A組元的混合組織,該類型組織屈服強度可達到600MPa,且具有較好的塑性和低溫沖擊性能.在了解低碳貝氏體鋼組織轉變特點的基礎上,利用冷卻制度控制中溫轉變組織類型能優化低碳貝氏體鋼的性能。

     

    Abstract: Based on the isothermal treatment and continuous cooling test of an Mn-Cu-Nb-B low carbon bainitic steel, it was found that several types of intermediate transformation could be formed in the range of 500-700℃. Cooling rate and finish cooling temperature have much effect on the final microstructure and mechanical properties of the steel. When the finish cooling temperature was selected around 630℃, a proper combination of quasipolygonal ferrite, granular bainite and fine M/A could be obtained. The yield stress of this type of microstructure could reach 600 MPa, with a better plasticity and low-temperature impact toughness. A proper control cooling process influences the intermediate transformation products, in this way the mechanical properties of a low carbon bainitic steel can be fairly optimized.

     

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