Title:
亀裂等発生検知方法、亀裂等発生検知装置及び亀裂等発生検知プログラム
Document Type and Number:
Japanese Patent JP7029061
Kind Code:
B2
Abstract:
To easily detect a crack having occurred in a steel material. A current measurement device measures a value of a current flowing through a target steel material that is immersed in an electrolyte aqueous solution and applied with tensile stress while subjected to hydrogen charging, and a device for detecting the occurrence of a crack or the like uses the measured current value to determine the occurrence of a crack in the target steel material when the amount of change in the current flowing through the target steel material, the change rate of the amount of change in the current, or the change rate of the change rate of the amount of change in the current exceeds a threshold value. The device for detecting the occurrence of a crack or the like determines the occurrence of a crack in the steel material when the change rate of the change rate of the amount of change in the current is less than a negative value of an absolute value of the threshold value, and determines the occurrence of fracture in the steel material when the change rate exceeds the absolute value of the threshold value.
Inventors:
Yosuke Takeuchi
Takuya Uesho
Masamitsu Watanabe
Takuya Uesho
Masamitsu Watanabe
Application Number:
JP2018107429A
Publication Date:
March 03, 2022
Filing Date:
June 05, 2018
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
G01N17/02; G01N3/08; G01N27/26
Domestic Patent References:
| JP2015169466A | ||||
| JP1269041A | ||||
| JP2017187441A | ||||
| JP2016057163A |
Foreign References:
| CN105842149A |
Other References:
阪大基礎工(院生) ○阿部 了,基礎工 堀川 敬太郎,小林 秀敏,千葉工大工 菅野 幹宏,新日鐵 藤井 秀樹,東大工 朝倉 健太郎,水素脆化を生じたSUS316L鋼の引張変形時の水素放出挙動,2007年春期(第140回)大会 日本金属学会講演大会概要 Collected Abstracts of the 2007 Spring Meeting of The Japan Institute of Metals ,社団法人日本金属学会 The Japan Institute of Metals
Attorney, Agent or Firm:
Hidekazu Miyoshi
Rie Kudo
Rie Kudo