[논문]Effect of Hydrogen Charging on the Mechanical Properties of 304 Stainless Steels

Lee, Sang-Pill; Hwang, Seung-Kuk; Lee, Jin-Kyung; Son, In-Soo; Bae, Dong-Su

doi:10.9726/kspse.2015.19.5.073

Effect of Hydrogen Charging on the Mechanical Properties of 304 Stainless Steels 원문보기

한국동력기계공학회지 = Journal of the korean society for power system engineering, v.19 no.5, 2015년, pp.73 - 79

Lee, Sang-Pill (Department of Mechanical Engineering, Dongeui University) , Hwang, Seung-Kuk (Department of Computer Aided Mechanical Design, Korea Polytechnic VII) , Lee, Jin-Kyung (Department of Mechanical Engineering, Dongeui University) , Son, In-Soo (Department of Mechanical Engineering, Dongeui University) , Bae, Dong-Su (Department of Advanced Materials Engineering, Dongeui University)

Abstract ▼ AI-Helper

The effects of hydrogen charging on the mechanical properties of 304 stainless steels were investigated in conjunction with the detailed examinations of their fracture modes. The dependence of the absorbed impact energy and the surface hardness of the 304 stainless steels on the hydrogen charging time was characterized. The tensile properties of the 304 stainless steels by the variation of cross-head speed were also evaluated at the room temperature. The hydrogen charging was performed by an electrolysis method for all specimens of the 304 stainless steels. The mechanical properties of the 304 stainless steels exhibited the sensitivity of embrittlement due to a hydrogen charging. The correlation between mechanical properties and fracture surfaces was discussed.

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가설 설정

As shown in Fig. 7(b), the ductile fracture morphology with large amount of wide and large-sized dimples was entirely existed at the center portion of fractured impact specimen. In addition, the 304 stainless steels displayed the typical cleavage fracture surface at the tearing portion of Fig.
1) The hydrogen content in the 304 stainless steels increased with the increase of hydrogen charging times. The 304 stainless steels possessed a hydrogen content of about 11.

제안 방법

The Vickers hardness of the 304 stainless steels was determined as an average value of 10 points. Both fracture surfaces and failure shapes of tensile and impact specimens were observed to examine the fracture mode of the 304 stainless steels by the hydrogen charging, using a stereoscopic microscope and a scanning electron microscope.
Both tensile test and impact test were carried out to investigate the effect of hydrogen charging on the mechanical properties of the 304 stainless steels. The hardness test was also performed to examine the surface strengthening of the 304 stainless steels by the hydrogen charging.
Both tensile test and impact test were carried out to investigate the effect of hydrogen charging on the mechanical properties of the 304 stainless steels. The hardness test was also performed to examine the surface strengthening of the 304 stainless steels by the hydrogen charging. The mechanical tests were immediately performed for the prevention of hydrogen release from the surface of specimen, after cleaning the charged specimen with a distilled water.
0 mm/min, respectively. The impact properties of the 304 stainless steels by the variation of hydrogen charging times were also examined at the room temperature, using a Charpy impact tester. The standard specimen with the dimension of 10 mm x 10 mm x 55 mm was used for the impact test of the 304 stainless steels.
The purpose of the present study is to investigate the hydrogen charging characteristics of the 304 stainless steels, based on the detailed examination of their mechanical properties and fractured surfaces. Especially, the effect of hydrogen charging time on the impact energy and the hardness of the 304 stainless steels was examined.

대상 데이터

The material used in the hydrogen charging experiment was 304 stainless steel with austenite microstructure. The specimens of the 304 stainless steels for tensile, impact and hardness tests were machined with the rolling direction of rolled plate, prior to the hydrogen charging.
The impact properties of the 304 stainless steels by the variation of hydrogen charging times were also examined at the room temperature, using a Charpy impact tester. The standard specimen with the dimension of 10 mm x 10 mm x 55 mm was used for the impact test of the 304 stainless steels. The V shaped notch with the depth of 2 mm was machined on the test specimen.
The mechanical tests were immediately performed for the prevention of hydrogen release from the surface of specimen, after cleaning the charged specimen with a distilled water. The tensile test specimen was machined, based on the criterion of ASTM G142. The diameter and the gauge length for center portion of tensile specimen were 6.
The hydrogen charging for the 304 stainless steels was carried out, using an electrolysis method. The test specimen of 304 stainless steels was attached at the cathode. The counter anode of platinum (Pt) was also mounted at the constant distance from the specimen.

이론/모형

The specimens of the 304 stainless steels for tensile, impact and hardness tests were machined with the rolling direction of rolled plate, prior to the hydrogen charging. The hydrogen charging for the 304 stainless steels was carried out, using an electrolysis method. The test specimen of 304 stainless steels was attached at the cathode.

성능/효과

2) Hydrogen-charged 304 stainless steels exhibited an obvious sensitivity for the cross-head speed, even though a similar fracture behavior was observed in the tensile loading. However, the ultimate tensile strength of the 304 stainless steel and its elongation tended to increase with the decrease in the cross-head speed.
4) The absorbed impact energy of the 304 stainless steel tended to decrease with the increase of hydrogen charging time, accompanying the cleavage fracture mode with a considerable reduction in the ductile dimples at the edge portion of fractured surfaces. These results are due to the hardening at the surface of the 304 stainless steel by the hydrogen charging process.

참고문헌 (13)

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DOI : 10.9726/kspse.2015.19.5.073 [무료]
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