Development of nondestructive evaluation method for ductile cast iron with casting skin

2015 Fiscal Year Final Research Report

• Project/Area Number: 25871025
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Materials/Mechanics of materials; Metal making/Resorce production engineering
• Research Institution: Asahikawa National College of Technology
• Principal Investigator: HORIKAWA Noritaka 旭川工業高等専門学校, システム制御情報工学科, 准教授 (80344480)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 球状黒鉛鋳鉄 / 非破壊試験 / 渦電流試験 / 基地組織 / 鋳肌 / 表面粗さ / 残留応力

Outline of Final Research Achievements

Nondestructive method for microstructure evaluation of ductile cast iron with various surface including casting surface was examined. Eddy current method was employed and the effects of the surface conditions on eddy current signal were investigated. Surface roughness and residual stress induced by machining indicated large effect on the eddy current signal. The effect of them can be distinguished by using both eddy current signals Vx and Vy. Lower testing frequency should be used to mitigate the effect of them. The change of the microstructure can be evaluated through the casting surface. The roughness of the casting surface affects detection of the chill structure.

Free Research Field

機械材料学，鋳造工学