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首页> 外文期刊>Corrosion Engineering, Science and Technology >Influence of heat treatments on microstructure and pitting corrosion resistance of 15%Cr supermartensitic stainless steel
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Influence of heat treatments on microstructure and pitting corrosion resistance of 15%Cr supermartensitic stainless steel

机译：热处理对15％Cr超马氏体不锈钢组织和抗点蚀性能的影响

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摘要

Supermartensitic is a new class of stainless steels in development and consolidation as commercial products. Significant changes on chemical composition of conventional martensitic stainless steels, such as the reduction of the carbon content to <0.03 wt-%, and the addition of Ni and Mo, marked the development of this new group of alloys. New grades containing higher amounts of Cr and small additions of Ti and/or Nb were developed recently. As a result, supermartensitic steels offer an interesting combination of high strength, toughness, weldability and corrosion resistance. In this work, the pitting corrosion resistance of a 15Cr supermartensitic steel with Ni, Mo and Cu additions was studied. It is well known that the mechanical properties and corrosion resistance of martensitic steels are adjusted by the final tempering treatment. Several single tempering treatments in the 300-650℃ range and double tempering treatments were performed in order to obtain different microstructures. The pitting corrosion resistance was investigated by electrochemical test in 3.5%NaCl solution. It was found that the pitting potential slightly decreased with the increase in temperature and time of tempering. The analysis of pits formed during the corrosion tests showed that ferrite islands are more corrosion resistant than the martensitic matrix due to the higher Cr and Mo contents.
机译：超级马氏体是作为商业产品正在开发和整合的新型不锈钢。常规马氏体不锈钢的化学成分发生了显着变化，例如碳含量降低至<0.03 wt％，以及添加了Ni和Mo，标志着这种新型合金的发展。最近开发了含有更高含量的铬和少量添加的钛和/或铌的新牌号。结果，超马氏体钢提供了高强度，韧性，可焊接性和耐腐蚀性的有趣组合。在这项工作中，研究了添加Ni，Mo和Cu的15Cr超级马氏体钢的耐点蚀性。众所周知，通过最后的回火处理来调节马氏体钢的机械性能和耐腐蚀性。为了获得不同的显微组织，在300-650℃范围内进行了几次单回火处理和两次回火处理。在3.5％NaCl溶液中通过电化学测试研究了耐点蚀性。发现随着温度和回火时间的增加，点蚀电位略有降低。对腐蚀试验中形成的凹坑的分析表明，由于较高的Cr和Mo含量，铁素体岛比马氏体基体更耐腐蚀。

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