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首页> 外文会议>Iron Steel Supplement 2005 vol.40: The Joint International Conference of HSLA Steels 2005 and ISUGS 2005 >Effect of Niobium Addition on Zn-coated 590 DP Steel
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Effect of Niobium Addition on Zn-coated 590 DP Steel

机译：铌对镀锌590 DP钢的影响

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The effect of Nb on the tensile properties, stretch flange formability and bake hardenability of 590 MPa TS grade DP steel is discussed. The base chemical composition was 0.05%C-2%Mn-0.5%Cr steel. The effect of Nb on the above-mentioned properties was studied using 0.05%Nb added steel. Cold rolled sheets were heat treated to simulate the heat cycle in the GA (galvannealing) and GI (galvanizing) processes. The effect of cooling rate after annealing at 850°C was also investigated to understand the allowable range of cooling rate on actual galvanizing line and the transformation behavior. It was found that the addition of 0.05%Nb results in improved elongation, stretch flangeability and bake hardenability. YR (yield ratio) of approximately 50% and YPEl (yield point elongation) of 0% were obtained in all steels. In the range of cooling rate after annealing from 2°C/s to 50°C/s, all steels displayed the typical DP property, that is a low YR and no YPE1. These excellent properties in Nb-added steel are attributed to a fine ferrite grain microstructure, together with fine martensite and fine interparticle spacing of martensite.
机译：讨论了Nb对590 MPa TS级DP钢的拉伸性能，拉伸凸缘成形性和烘烤硬化性的影响。基础化学成分为0.05％C-2％Mn-0.5％Cr钢。使用添加了0.05％Nb的钢研究了Nb对上述性能的影响。对冷轧板进行热处理，以模拟GA（镀锌）和GI（镀锌）过程中的热循环。还研究了在850°C退火后冷却速率的影响，以了解冷却速率对实际镀锌线的允许范围和相变行为。发现添加0.05％Nb导致改善的伸长率，拉伸凸缘性和烘烤硬化性。在所有钢中均获得约50％的YR（屈服比）和0％的YPE1（屈服点伸长率）。在退火后的冷却速度从2°C / s到50°C / s的范围内，所有钢都表现出典型的DP特性，即低YR而没有YPE1。含铌钢中的这些优异性能归因于良好的铁素体晶粒微观结构，以及良好的马氏体和良好的马氏体颗粒间间距。

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