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    調(diào)質(zhì)工藝對(duì)Q390E海洋工程用管組織與性能的影響

    Effect by Quenching and Tempering Process on Microstructure and Properties of Q390E Steel Pipe for Offshore Engineering

    • 摘要: 用力學(xué)性能測(cè)試和微觀組織分析等方法，研究了不同調(diào)質(zhì)工藝對(duì)Q390E海洋工程用管微觀組織和力學(xué)性能的影響。結(jié)果表明：Q390E海洋工程用管在890℃淬火+690℃回火可獲得全部貝氏體，其強(qiáng)韌性匹配最佳；Q390E海洋工程用管實(shí)際的Ac1溫度在690～710℃；在相同淬火溫度時(shí)，當(dāng)回火溫度升高至710℃，Q390E海洋工程用管在兩相區(qū)回火，基體組織出現(xiàn)明顯的先共析鐵素體，材料的低溫沖擊韌性嚴(yán)重惡化，且抗拉強(qiáng)度上升，屈強(qiáng)比降低。

       

      Abstract: Investigated are the effects by different quenching and tempering processes on the microstructure and mechanical properties of the Q390E steel pipe for offshore engineering by means of mechanical property testing and microstructure analysis.The results indicate that after being quenched at 890℃ and tempered at 690℃, the microstructure of the Q390E pipe is completely bainite, and has the best strength-low temperature toughness matching;and that the actual Ac1 temperature of the pipe is about 690~710℃, and at the same quenching temperature, when the tempering temperature is going up to 710℃, and the pipe is tempered at a two-phase zone, and proeutectoid ferrite obviously developed in the matrix microstructure, which leads to seriously deteriorated lowtemperature impact toughness, increased tensile strength, and decreased yield ratio of the material.

       

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