Evaluation of Microarea Mechanical Properties of SUS/WC Surface Hardened Composite Material Prepared by Pulsed Current Sintering Process

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  • パルス通電焼結法で作製されたＳＵＳ／ＷＣ表面硬化材料の微細領域における機械的性質の評価
  • パルス ツウデン ショウケツホウ デ サクセイサレタ SUS WC ヒョウメン コウカ ザイリョウ ノ ビサイ リョウイキ ニ オケル キカイテキ セイシツ ノ ヒョウカ

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Abstract

In order to improve wear properties of austenite stainless steel, we applied powder composite process to obtain thick hard layer on stainless steel. The raw alloy powder was prepared by planetary ball milled tungsten carbide (WC) powder and SUS316L stainless steel powder. Sintering process was performed by pulsed current sintering (PCS) method. Wear properties were evaluated by pin-on-disk wear testing machine, and a remarkable improvement was confirmed in wear resistance property. In this investigation, we applied micro-sized testing technique to evaluate mechanical properties of WC layer and Stainless interface of layer. Micro-sized cantilever specimens with a size of 10×20×50μm3 were prepared by focused ion beam machining system. Micro-sized bending tests were successfully completed using a mechanical testing machine for micro-sized specimens. The maximum bending stresses were different for stainless matrix, interface layer, and SUS/WC composite. Ductile rapture surface was observed at stainless matrix, and brittle rapture surfaces at interface of WC layer and Stainless layer and SUS/WC composite layer.

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