Development of NiCrSiBC Weld Hardfacing Approach for P91 Steels Used in Steam Turbine Components

IF 0.3 4区材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING

Soldagem & Inspecao Pub Date : 2021-05-19 DOI:10.1590/0104-9224/SI26.08

H. Naik, V. Kalyankar

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引用次数: 2

Abstract

Abstract: P91 steels are used as substrate material for steam turbine components like bush, valve seat internals, and engineering valves. These components have hardfacing of cobalt-based material to reduce the high temperature wear loss and to improve the surface hardness. However, delamination failure and higher heat affected zone (HAZ) hardness were identified challenges for P91 steels. Hence, this demands the development of a suitable weld hardfacing approach to resolve the said challenges. In this work, NiCrSiBC (Colmonoy 6) has been considered as a hardfacing material to replace cobalt-based Stellite 6 material due to elimination of radiation activity, lower cost, and higher coating hardness. FCAW and PTA techniques were used to deposit buffer layer (SS-309L) and hardfacing layer (NiCrSiBC) respectively. Sample WBL (with deposition of buffer layer) and sample WOBL (without deposition of buffer layer) are considered approaches to study the metallurgical characterization for each case. Higher coating hardness, lower HAZ hardness and lower Fe dilution were observed in sample WBL. Cr7C3, Cr2B, and Cr5B3 hard phases in block shape together with ϒ- nickel matrix solid solution was observed in coating region of sample WBL. Overall, sample WBL approach was considered to overcome weld hardfacing challenges for steam turbine industries.

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汽轮机部件P91钢NiCrSiBC堆焊工艺的发展

摘要:P91钢是汽轮机衬套、阀座内件和工程阀门等部件的衬底材料。这些部件采用钴基材料堆焊，以减少高温磨损，提高表面硬度。然而，脱层失效和高热影响区(HAZ)硬度是P91钢面临的挑战。因此，这需要开发一种合适的焊接堆焊方法来解决上述挑战。在本研究中，NiCrSiBC (Colmonoy 6)由于具有消除辐射活性、成本较低、涂层硬度较高等优点，被认为是替代钴基Stellite 6材料的堆焊材料。采用FCAW和PTA技术分别沉积缓冲层(SS-309L)和堆焊层(NiCrSiBC)。样品WBL(有缓冲层沉积)和样品WOBL(没有缓冲层沉积)被认为是研究每种情况下冶金特性的方法。样品WBL的镀层硬度较高，热影响区硬度较低，铁稀释度较低。在WBL样品的涂层区观察到Cr7C3、Cr2B和Cr5B3的块状硬相以及γ -镍基固溶体。总体而言，样品WBL方法被认为可以克服汽轮机行业面临的焊接硬化挑战。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Soldagem & Inspecao 工程技术-冶金工程

CiteScore

1.00

自引率

16.70%

发文量

审稿时长

12 weeks

期刊介绍： The Journal Soldagem & Inspeção (S&I) js a techno-scientific journal created in 1995. Printed issues of this journal are distributed free of charge to libraries in Brazil, Latin America and the Iberian Peninsula. It has been printed regularly every quarter since September, 2002, and, since the beginning of 2007, its electronic version is available in the address: (http://www.abs-soldagem.org.br/s&i/). The journal is sponsored by the Brazilian Welding Association (ABS). Since its creation several well known professionals working in welding contributed with the Journal Soldagem & Inspeção and its editorial board crosses the Brazilian borders. During its evolution the Journal received ta special contribution from the Editors-in-chief : Ronaldo Paranhos, Américo Scoti, Paulo Modenesi e Alexandre Bracarence. Since January 2012 the Editor-in-chief is Ana Sofia C. M. D’Oliveira, Full professor at Universidade Federal do Paraná (UFPR) . Her work focus mainly on Hardfacing and Physical Metallurgy. The jornal Soldagem & Inspeção also counts with 10 Associate Editors and a fix Editorial board of referees. short-term (Ad Hoc) referees can be invited to evaluate some papers submitted to the journal. The Soldagem & Inspeção journal is the scientific divulgation channel of the Brazilian Welding Association (ABS). It aims to publish original papers related to the scientific and technological development of welding, inspection, and related fields. Review papers or letters on current and controversial subjects are also published in the Journal. Its abbreviated title is Soldag. insp. (Impr.), which should be used in bibliographies, footnotes and bibliographical references and strips.