高感度磁気センサを用いた熱時効したインコネル600合金の磁気的非破壊評価

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2021/08/01

タイトル(英語): Magnetic Nondestructive Evaluation Using Higher Sensitive Magnetic Field Sensor for Thermally Aged Inconel 600 Alloy

著者名: 菊池　弘昭（岩手大学理工学部），高橋　秀樹（岩手大学理工学部），Ralf　Tschuncky（ドイツ フラウンホーファー研究所非破壊検査部門），Klaus　Szielasko（ドイツ フラウンホーファー研究所非破壊検査部門）

著者名(英語): Hiroaki Kikuchi (Iwate University), Hideki Takahashi (Iwate University), Ralf Tschuncky (Fraunhofer Institute for Nondestructive Testing (IZFP)), Klaus Szielasko (Fraunhofer Institute for Nondestructive Testing (IZFP))

キーワード: 強磁性，磁気センサ，Cr欠乏，粒界　　ferromagnetism，magnetic sensor，Cr depletion，grain boundary

要約(英語): Ni base alloy, Inconel 600, has high strength and high corrosion resistance, and is therefore widely used for steam generators tubing in power generation plant. During long term plant operation at higher temperature, sensitization occurs along grain boundary, which will induce stress corrosion cracking. The alloy is paramagnetic basically, however it transforms into ferromagnetic along grain boundaries when Cr depletion occurs. Since Cr depletion is attributed to sensitization of the material, nondestructive testing for sensitization using changes in magnetic properties will be possible. Here, Inconel 600 alloy was heat treated at 600℃ from 0 to 400 hours to occur sensitization. Then magnetic field sensor with relatively higher sensitivity scanned over the sensitized specimen. The change in the magnetic field near the surface of specimen is related to the degree of chromium carbides progressing sensitization. The obtained results suggest that scanning with magnetic field sensor is effective to assess sensitization due to heat treatment for Ni base alloy.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.141 No.8 （2021） 特集：磁気センサの高機能とシステム化の新展開

本誌掲載ページ: 452-457 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/141/8/141_452/_article/-char/ja/