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    740~900℃區(qū)間內(nèi)氮對C-Mn鋼熱加工性能的影響

    Influence by Nitrogen on Hot Workability of C-Mn Steel at Temperature Ranging from 740 to 900℃

    • 摘要: 研究了N元素對C-Mn鋼在740～900℃的熱加工性能的影響，并分析討論其影響機理，以及N、Al元素的作用。為模擬鋼管熱變形時的狀態(tài)，將試樣直接加熱到740～900℃，采用1×10-3s-1應變速率進行拉伸，并用斷面收縮率評價熱塑性。試驗結果表明：隨著N含量的增加，C-Mn鋼在740～900℃的熱塑性降低，峰值應力升高；N會促使AlN沿奧氏體晶界析出，促進沿晶斷裂；N會抑制動態(tài)再結晶，這可能是氮加寬熱塑性低谷區(qū)的原因；AlN的析出由Al含量和N含量的乘積決定，降低Al含量也有助于改善鋼的熱塑性。

       

      Abstract: Investigated is the influence by Element N on the hot workability of the C-Mn steel within the temperature range as 740~900℃.Also discussed are the mechanism of the influence, and the effects by N and Al.To simulate the thermo-mechanical conditions, tensile tests are carried out to the specimens as directly heated to a temperatures ranging from 740 to 900℃ with an initial strain rate of 1×10-3s-1.After each test, the reduction of cross section area of the specimen is used to measure the hot ductility.The test results indicate that when nitrogen content is rising, the hot ductility of the C-Mn steel is going down within the temperature range as 740~900℃, whereas the stress peak going up.It is also identified that nitrogen causes fine AlN precipitated along the austenite grain boundaries, promoting low ductility intergranular failure, and that nitrogen also retards dynamic re-crystallization, which probably is why nitrogen widens the hot ductility trough area.Moreover the AlN precipitation is determined by the product of N content and Al content, and therefore the hot ductility of the said steel can be improved by means of decreasing Al content within the foresaid temperature range.

       

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