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首页> 外文期刊>ISIJ international >Tailor Welded Partition Blanks: New Methods Improve the Ductility of Ultra-high-strength Welded Joint
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Tailor Welded Partition Blanks: New Methods Improve the Ductility of Ultra-high-strength Welded Joint

机译：量身定制的焊接隔板毛坯：新方法提高了超高强度焊接接头的延展性

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摘要

A novel quenching and partitioning (QP) processing was applied to the ultra-high-strength tailor welded blanks (TWBs) with an equiaxed martensite, retained austensit and carbides in the weld. The QP processing consisted of a cooling step and a partition step at 450°C for 10 s to 30 s. The fraction of martensite after the processing was nearly 64%. During partitioning, carbides precipitates with an average size of 30 nm formed inside the martensite. Currently, the interstitial content of austenite was increased to an average of almost 1.2 wt.%. After QP processing, the TWB of partition joints exhibited outstanding mechanical properties including a yield strength of 450 MPa, a tensile elongation of 15% at room temperature, and a formability ratio of 108.72% and 81.66%, with respect to the BMs DP1180 and DP590. Furthermore, the tempered martensite formation and austenite ductile-effect were attributed to the formability improvement of ultra-strength-steel TWBs.
机译：对具有等轴马氏体，在焊接中保留奥氏体和碳化物的超高强度拼焊板（TWB）进行了新颖的淬火和分配（QP）工艺。 QP处理包括冷却步骤和在450°C下进行10 s至30 s的分配步骤。加工后的马氏体比例接近64％。在分配过程中，马氏体内部形成的碳化物平均尺寸为30 nm。目前，奥氏体的间隙含量增加到平均几乎1.2重量％。经过QP处理后，分隔缝的TWB相对于BM DP1180和DP590表现出出色的机械性能，包括450 MPa的屈服强度，室温下15％的拉伸伸长率以及108.72％和81.66％的可成形性比。 。此外，回火马氏体的形成和奥氏体的延展性归因于超强度钢TWB的可成形性的提高。

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