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首页> 外文会议>International Conference on Microalloying for New Steel Processes and Applications; 20050907-09; Basque Country(ES) >Influence of Severe Accumulative Rolling in a Low Carbon Microalloyed Steel
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Influence of Severe Accumulative Rolling in a Low Carbon Microalloyed Steel

机译：低碳微合金钢中严重累积轧制的影响

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摘要

Effect of the severe deformation by multi-pass rolling on microstructure and tensile properties was analyzed in terms of rolling temperature, plate thickness, and cooling rate for a modified API X65 steel containing B. The plates, 80 and 50 mm thickness, were rolled six times by 20%/pass (total 75%) to 20 and 12 mm, at 1023 K of unrecrystallized γ region or 973 K of intercritical (α+γ) region, and then quenched in water or oil. All specimens except one oil-quenched condition showed relatively high UTS 700-830 MPa and the continuous yielding(YR ～ 0.6), typical mode of the (ferrite + martensite (bainite)) dual phase microstructure. In contrast, one oil-quenched specimen with the 973 K-20 mm condition, exhibited the discontinuous yielding (YR ～ 0.8), indicating that the microstructure basically consists of ferrite plus pearlite, as well as a relatively low UTS 660 MPa. The degree of deformation really occurring within materials, i.e., strain hardening seems to be enhanced with a decrease in deformation temperature. As the degree of deformation increases, the remaining austenite, not dynamically transformed to fine ferrite, becomes increasingly unstable. A lower hardenability of this remaining austenite thus would lead to a higher possibility to transform into the (ferrite + pearlite) structure of lower strength rather than the (ferrite + martensite (bainite)) of higher strength.
机译：针对含B的改良API X65钢，通过轧制温度，板厚和冷却速率，分析了多道次轧制造成的严重变形对组织和拉伸性能的影响。将80和50 mm厚度的板轧制了6个在未重结晶的γ区域的1023 K或在临界（α+γ）区域的973 K处，以20％/次（总计75％）通过20毫米（总计75％），然后在水或油中淬火。除一种油淬火条件外，所有试样均表现出较高的UTS 700-830 MPa和连续屈服（YR〜0.6），这是（铁素体+马氏体（贝氏体））双相组织的典型模式。相比之下，在973 K-20 mm条件下的一个油淬试样表现出不连续屈服（YR〜0.8），表明其显微组织主要由铁素体和珠光体组成，以及较低的660 MPa UTS。材料中真正发生的变形程度，即应变硬化似乎随着变形温度的降低而增强。随着变形程度的增加，未动态转变为细铁素体的残余奥氏体变得越来越不稳定。因此，这种残余奥氏体的较低淬透性将导致其更有可能转变为强度较低的（铁素体+马氏体（贝氏体））而不是强度较高的（铁素体+珠光体）组织。

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