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首页> 外文期刊>Journal of Materials Science >Influence of heat treatments on toughness and sensitization of a Ti-alloyed supermartensitic stainless steel
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Influence of heat treatments on toughness and sensitization of a Ti-alloyed supermartensitic stainless steel

机译：热处理对钛合金超马氏体不锈钢韧性和敏化的影响

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摘要

Supermartensitic steels are a new class of martensitic stainless steels developed to obtain higher corrosion resistance and better toughness through the reduction of carbon content, and addition of Ni and Mo. They were developed to more critical applications or to improve the performance obtained with conventional grades AISI 410, 420, and 431. In this study, the influences of the tempering parameters on the microstructure, mechanical properties (hardness and toughness), and sensitization of a Ti-alloyed supermartensitc stainless steel were investigated. The material showed temper embrittlement in the 400–600 °C range, as detected by low temperature (−46 °C) impact tests. The degree of sensitization measured by double loop reactivation potentiodynamic tests increased continuously with the increase of tempering temperature above 400 °C. Healing due to Cr diffusion at high tempering temperatures was not observed. Double tempered specimens showed high amounts (20%) of reverse austenite but their toughness were similar to specimens single tempered at 625 and 650 °C.
机译：超马氏体钢是一类新型的马氏体不锈钢，其开发目的是通过减少碳含量和添加Ni和Mo来获得更高的耐腐蚀性和更好的韧性。它们被开发用于更关键的应用或改善常规等级AISI所获得的性能。 410、420和431。在本研究中，研究了回火参数对钛合金超马氏体不锈钢的显微组织，机械性能（硬度和韧性）和敏化的影响。通过低温（-46°C）冲击试验检测到，该材料在400-600°C范围内显示回火脆化。随着回火温度升高到400°C以上，通过双回路再活化电位动力学测试测得的敏化度不断增加。在高回火温度下未观察到由于Cr扩散引起的愈合。双回火试样显示出大量（> 20％）的反向奥氏体，但其韧性与在625和650°C下单回火的试样相似。

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    《Journal of Materials Science》 |2011年第24期|p.7737-7744|共8页
  • 作者

    G. F. da Silva; S. S. M. Tavares; J. M. Pardal; M. R. Silva; H. F. G. de Abreu;

  • 作者单位

    PETROBRAS-UO-Rio, Rua General Canabarro, 500, Rio de Janeiro, CEP 20271-205, Brazil;

    Departamento de Engenharia Mecânica, Universidade Federal Fluminense, Rua Passo da Pátria, 156, Niterói, CEP 24210-240, Brazil;

    Departamento de Engenharia Mecânica, Universidade Federal Fluminense, Rua Passo da Pátria, 156, Niterói, CEP 24210-240, Brazil;

    Instituto de Ciências, Universidade Federal de Itajubá, Minas Gerais, Brazil;

    Departamento de Engenharia Metalúrgica e Materiais, Universidade Federal do Ceará, Campus do Pici, Bloco 702, Fortaleza, CEP 60455-760, Brazil;

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