Metal interlayers to prevent ‘hard zone’ formation in dissimilar weldments of Cr-Mo steels — A comparison between Cu, Co and Ni
Metal interlayers to prevent ‘hard zone’ formation in dissimilar weldments of Cr-Mo steels — A comparison between Cu, Co and Ni
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防止 Cr-Mo 钢异种焊件形成“硬区”的金属夹层 — Cu、Co 和 Ni 之间的比较
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
M. Vijayalakshmi
中科院分区：
文献类型：
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作者：
R. Anand;C. Sudha;T. Karthikeyan;A. Terrance;S. Saroja;M. Vijayalakshmi
不同铁素体钢焊接件在使用过程中或焊后热处理过程中的高温暴露会导致在焊接界面附近形成有害的“硬”区和“软”区。活性梯度驱动的碳扩散被发现是形成这些区域的原因。建议的抑制区域形成的方法之一是使用碳扩散屏障。利用基于有限差分方法的数值模拟研究了该方法的有效性。由于铜、钴和镍的正相互作用参数ɛCM与碳的相互作用，因此对铜、钴和镍等扩散屏障进行了评估。研究发现，在9Cr-1Mo和2.5Cr-1Mo铁素体钢之间引入这些中间层可降低硬软区的形成倾向。通过计算发现，它们的效率与碳的相互作用参数的不同有很好的相关性。
High temperature exposure of dissimilar ferritic steel weldments either during service or during post weld heat treatment has been found to result in the formation of deleterious ‘hard’ and ‘soft’ zones near the weld interface. Activity gradient driven carbon diffusion was found to be responsible for the formation of the zones. One of the methods suggested for suppression of the zone formation is by use of carbon diffusion barriers. The effectiveness of this method was investigated in this study using numerical simulations based on finite difference method. Diffusion barriers like copper, cobalt and nickel were evaluated for this purpose due to their positive interaction parameter, ɛCM with carbon. It was found that these interlayers if introduced between 9Cr-1Mo and 2¼Cr-1Mo ferritic steels reduce the propensity for formation of hard and soft zones. It was found by computation that their efficiency correlates well with the differences in interaction parameter with carbon.