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首页> 外文期刊>Corrosion Engineering, Science and Technology >Carbide precipitation in HAZ of multipass welds in titanium containing and titanium free supermartensitic stainless steels Part 1 - Proposed precipitation mechanisms
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Carbide precipitation in HAZ of multipass welds in titanium containing and titanium free supermartensitic stainless steels Part 1 - Proposed precipitation mechanisms

机译：含钛和无钛超马氏体不锈钢多道焊缝的热影响区中的碳化物析出第1部分-拟议的析出机理

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摘要

Precipitation reactions in the coarse grained heat affected zone of high grade (0-1 percent Ti) and medium grade (Ti free) 13 percent Cr supermartensitic stainless steels have been studied. During multipass welding, a high density of (Ti,Cr)C and (Cr,Fe,Mo,Si)_(23)C_6 particles formed at prior austenite grain boundaries in high and medium grade steels respectively. Chromium depleted zones along prior austenite grain boundaries were found in the medium grade steel, and these zones are assumed to be the reason for the well known sensitivity to intergranular corrosion of these steels. After post-weld heat treatment the depletion was eliminated, explaining the improved corrosion resistance generally observed after such a treatment. The replacement of chromium carbides with titanium carbides in the high grade steel explains the enhanced resistance to grain boundary corrosion generally observed in this type of steel. A possible precipitation mechanism based on repeated heating during multipass welding is advanced for both steels.
机译：研究了高品位（0-1％Ti）和中品位（无钛）13％Cr超马氏体不锈钢的粗粒热影响区的析出反应。在多道次焊接过程中，高和中等级钢中分别在先前的奥氏体晶界处形成了高密度的（Ti，Cr）C和（Cr，Fe，Mo，Si）_（23）C_6颗粒。在中等级钢中发现了沿先前奥氏体晶界的铬耗尽区，这些区被认为是众所周知的这些钢对晶间腐蚀敏感性的原因。在焊后热处理之后，消除了损耗，这解释了在这种处理之后通常观察到的改善的耐腐蚀性。在高级钢中用碳化钛代替碳化铬说明了这种钢通常具有的增强的抗晶界腐蚀的能力。两种钢都提出了基于多道次焊接过程中反复加热的可能析出机理。

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