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首页> 外文期刊>Journal of Iron and Steel Research International >Design of TRIP Steel With High Welding and Galvanizing Performance in Light of Thermodynamics and Kinetics
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Design of TRIP Steel With High Welding and Galvanizing Performance in Light of Thermodynamics and Kinetics

机译：从热力学和动力学角度看高焊接镀锌性能的TRIP钢的设计。

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摘要

A new type of transformation induced plasticity (TRIP) steel with not only high strength and high ductility but also superior welding and galvanizing properties was designed and developed recently. Low carbon and low silicon content were preliminarily selected with the aim of meeting the requirements of superior quality in both welding and galvanizing. Phosphorus was chosen as one of the alloying elements, because it could reduce carbon activity in cementite and increase the stability of austenite. In addition, the possibility of phosphorus segregating at grain boundary was also discussed by thermodynamics as well as kinetics. Phase diagram was estimated at high temperature and the composition of the steel was then selected in the hyperperitectic range to avoid problems, which might occur in sheet steel continuous casting. Phase diagram in the inter-critical temperature was estimated for the steel to obtain the starting temperature of fast cooling. For understanding the minimum rate of fast cooling, pearlite growth kinetics was calculated with self-developed diffusion coefficients of elements in grain boundary. Overaging temperature was determined through the calculation of T_0 temperature by both equilibrium and para-equilibrium assumptions, which was different from the current determination, which is only based on an equilibrium estimation.
机译：最近，设计并开发了一种新型的相变诱导塑性（TRIP）钢，该钢不仅具有高强度和高延展性，而且具有优异的焊接和镀锌性能。为了满足焊接和镀锌的高质量要求，预先选择了低碳和低硅含量。选择磷作为合金元素之一是因为它可以降低渗碳体中的碳活度并增加奥氏体的稳定性。另外，还通过热力学和动力学讨论了磷在晶界偏析的可能性。在高温下估计相图，然后在高包晶范围内选择钢的成分，以避免在钢板连续铸造中可能出现的问题。估算钢的临界温度下的相图以获得快速冷却的起始温度。为了了解最小的快速冷却速率，珠光体的生长动力学是根据晶界中元素的自发扩散系数计算的。通过根据平衡和对平衡假设计算T_0温度来确定过时效温度，这与仅基于平衡估计的当前确定不同。

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