An Investigation of Hydrogen Environment Effect on the Strain Aging of Low-Carbon Steel through Vickers Hardness Test

2012 ◽  
Vol 41 (1) ◽  
pp. 20120190
Author(s):  
Dongsun Lee ◽  
Aki-nori Yamamoto ◽  
Yasuji Oda ◽  
Hiroshi Noguchi
Keyword(s):  
Carbon Steel ◽  
Vickers Hardness ◽  
Strain Aging ◽  
Low Carbon Steel ◽  
Hardness Test ◽  
Low Carbon ◽  
Environment Effect ◽  
Hydrogen Environment ◽  
Vickers Hardness Test

Temperature Dependence of Fatigue Crack Growth in Low-Carbon Steel Under Gaseous Hydrogen

2019 ◽  
Author(s):  
Osamu Takakuwa ◽  
Yuhei Ogawa ◽  
Saburo Okazaki ◽  
Hisao Matsunaga ◽  
Saburo Matsuoka
Keyword(s):  
Fatigue Crack ◽  
Carbon Steel ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Low Carbon Steel ◽  
Gaseous Hydrogen ◽  
Low Carbon ◽  
Hydrogen Environment ◽  
Crack Wake ◽  
Higher Temperature

Abstract In order to elucidate the temperature dependence of hydrogen-assisted fatigue crack growth (HAFCG), the fatigue crack growth (FCG) test was performed on low-carbon steel JIS-SM490B according to ASTM E647 using compact tension (CT) specimen under 0.7 MPa (≈ 0.1 ksi) hydrogen-gas at room temperature (RT: 298 K (≈ 77 °F)) and 423 K (≈ 302 °F) at stress intensity factor range of ΔK = 30 MPa m1/2 (≈ 27 ksi in1/2). Electron backscatter diffraction (EBSD) observation was performed on the mid-thick section of CT specimen in order to investigate change in plasticity around the crack wake in gaseous hydrogen environment and how it changes due to temperature elevation. The obtained results showed the higher temperature, the lower intense of HAFCG as reported in our previous article. Plasticity around the crack wake became less in gaseous hydrogen environment, especially tested at 298 K. The propensity of the results obtained at higher temperature (423 K) can be separated into two cases: (i) intense plasticity occurs like tested in air, (ii) crack propagates straighter accompanying less plasticity like tested in gaseous hydrogen environment at 298 K. This implies macroscopic FCG rate is determined by combination of microscopic FCG rate in the case (i) and case (ii).

Steel Hardness Determination Using the Barkhausen Noise Effect

2011 ◽  
Vol 495 ◽  
pp. 229-232
Author(s):  
Eirini Varouti ◽  
C. Giannouli ◽  
Z. Petrakou ◽  
K. Sapountzi
Keyword(s):  
Plastic Deformation ◽  
Carbon Steel ◽  
Vickers Hardness ◽  
Mechanical Treatment ◽  
Low Carbon Steel ◽  
Barkhausen Noise ◽  
Low Carbon ◽  
Noise Effect ◽  
Duplex Steel ◽  
Non Destructive

The Barkhausen noise technique (BHN) has been used as a non destructive tool for the measurement of the hardness in various types of steel, namely low carbon steel, TRIP steel, Duplex steel and welding in low carbon steel. The steel samples have undergone different mechanical treatment, such as plastic deformation, cold rolling or welding. Hardness and microhardness have been determined in terms of Vickers standards. A remarkably linear dependence of the BHN on the Vickers hardness of the corresponding samples with an uncertainty in the order of 3-5% has been achieved, illustrating that the BHN may be used as a non destructive tool for determining the Vickers hardness in steels. Furthermore, BHN measurements have obtained on the welding area, along the thermally affected zone and the weld itself, illustrating the theoretically expected stress field distribution.

OS2210 Slip Behavior Observation on Low Carbon Steel in Hydrogen Environment

2011 ◽  
Vol 2011 (0) ◽  
pp. _OS2210-1_-_OS2210-3_
Author(s):  
Toshiro MATSUMOTO ◽  
Dongsun LEE ◽  
Yasuji ODA ◽  
Hiroshi NOGUCHI
Keyword(s):  
Carbon Steel ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Hydrogen Environment ◽  
Behavior Observation
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