<th id="5nh9l"></th><strike id="5nh9l"></strike><th id="5nh9l"><noframes id="5nh9l"><th id="5nh9l"></th><strike id="5nh9l"></strike>
<progress id="5nh9l"><noframes id="5nh9l"><th id="5nh9l"><noframes id="5nh9l">
<th id="5nh9l"></th> <strike id="5nh9l"><noframes id="5nh9l"><span id="5nh9l"></span>
<progress id="5nh9l"><noframes id="5nh9l"><span id="5nh9l"><noframes id="5nh9l"><span id="5nh9l"></span><strike id="5nh9l"><noframes id="5nh9l"><strike id="5nh9l"></strike>
<span id="5nh9l"><noframes id="5nh9l">
<span id="5nh9l"><noframes id="5nh9l">
<span id="5nh9l"></span><span id="5nh9l"><video id="5nh9l"></video></span>
<th id="5nh9l"><noframes id="5nh9l"><th id="5nh9l"></th>
<progress id="5nh9l"><noframes id="5nh9l">

低碳鋼和中碳鋼連鑄方坯初始凝固的對比研究

Comparative study on the initial solidification behavior of continuous casting billets between low-carbon steel and medium-carbon steel

  • 摘要: 以低碳鋼和中碳鋼為研究對象,圍繞不同連鑄工藝參數對方坯初始凝固行為的影響,利用CA-FE耦合模型模擬實際連鑄過程結晶器內方坯的初始凝固行為,考察拉速和過熱度對方坯出結晶器坯殼厚度的影響,對比二者出結晶器橫截面枝晶微觀形貌.研究表明:過熱度和拉速增加均能使出結晶器坯殼厚度下降,而拉速的影響更為顯著.不同鋼種在相同條件下出結晶器坯殼厚度下降梯度不同.過熱度越低柱狀晶越致密細小,利于提高連鑄坯質量,拉速對柱狀晶的影響相對較小.由于出結晶器坯殼安全厚度限制,過熱度取15℃,低碳鋼拉速不能超過2.2 m·min-1,中碳鋼拉速不能超過2.5 m·min-1,據此針對不同鋼種設計不同拉速可提高連鑄效率.同時,模型結果顯示低碳鋼出結晶器時刻柱狀晶更為發達.

     

    Abstract: Low-carbon steel and medium-carbon steel were taken as the objects of research in this paper. In order to study the effects of process parameters on the initial solidification behavior of continuously cast billets,a CA-FE coupled method was used to simulate the initial solidification behavior of billets in the mold during practical continuous casting. The dependences of initial billet shell thickness at the exit of the mold upon superheat and casting speed were investigated and the microstructure morphologies of the two steels were compared at the same time. It is shown that the shell thickness decreases with increasing superheat and casting speed,while the casting speed has a more significant impact. The shell thickness of different steels decreases at different gradients under the same condition. The lower the superheat temperature,the more compact the columnar crystals will be,which is useful to improve the quality of continuous casting billets,while the casting speed has less influence. With the constraint of shell thickness at the exit of the mold,the superheat is taken to be 15℃,and the casting speeds of low-carbon steel and medium-carbon steel could not surpass 2.2m·min-1 and 2.5 m·min-1,respectively. According to this result,we can design the optimum drawing speeds for different steel grades to improve the efficiency of continuous casting. Moreover,the model results show that the columnar crystals of low-carbon steel is more developed than those of medium-carbon steel.

     

/

返回文章
返回
<th id="5nh9l"></th><strike id="5nh9l"></strike><th id="5nh9l"><noframes id="5nh9l"><th id="5nh9l"></th><strike id="5nh9l"></strike>
<progress id="5nh9l"><noframes id="5nh9l"><th id="5nh9l"><noframes id="5nh9l">
<th id="5nh9l"></th> <strike id="5nh9l"><noframes id="5nh9l"><span id="5nh9l"></span>
<progress id="5nh9l"><noframes id="5nh9l"><span id="5nh9l"><noframes id="5nh9l"><span id="5nh9l"></span><strike id="5nh9l"><noframes id="5nh9l"><strike id="5nh9l"></strike>
<span id="5nh9l"><noframes id="5nh9l">
<span id="5nh9l"><noframes id="5nh9l">
<span id="5nh9l"></span><span id="5nh9l"><video id="5nh9l"></video></span>
<th id="5nh9l"><noframes id="5nh9l"><th id="5nh9l"></th>
<progress id="5nh9l"><noframes id="5nh9l">
259luxu-164