scholarly journals Evaluation for Hydrogen Embrittlement Properties of Tempered Martensitic Steel Sheets Using Several Testing Technique

2014 ◽  
Vol 100 (10) ◽  
pp. 1306-1314 ◽  
Author(s):  
Tomohiko Hojo ◽  
Hiroyuki Waki ◽  
Fumihito Nishimura
Keyword(s):  
Hydrogen Embrittlement ◽  
Martensitic Steel ◽  
Testing Technique ◽  
Steel Sheets

scholarly journals Effects of Residual Stress on Hydrogen Embrittlement of a Stretch-Formed Tempered Martensitic Steel Sheet

2020 ◽  
Author(s):  
Hayato Nishimura ◽  
Tomohiko Hojo ◽  
Saya Ajito ◽  
Yuki Shibayama ◽  
Motomichi Koyama ◽  
...  
Keyword(s):  
Residual Stress ◽  
Hydrogen Embrittlement ◽  
Steel Sheet ◽  
Martensitic Steel

Effects of Microstructure on the Hydrogen Embrittlement Resistance of Ultra High Strength Martensitic Steel Sheets

2021 ◽  
Vol 1016 ◽  
pp. 1331-1336
Author(s):  
Kosuke Shibata ◽  
Takuya Hiramatsu ◽  
Atsuhiro Shiraki ◽  
Junichiro Kinugasa ◽  
Tatsuya Asai ◽  
...  
Keyword(s):  
Low Temperature ◽  
Hydrogen Embrittlement ◽  
Carbon Content ◽  
Fracture Morphology ◽  
Hydrogen Trapping ◽  
Tempered Martensite ◽  
Interstitial Carbon ◽  
Steel Sheets ◽  
Embrittlement Resistance ◽  
Hydrogen Embrittlement Resistance

In this study, the relationship between hydrogen embrittlement resistance (HER) and the microstructure of low temperature tempered martensite was investigated using steel sheets which were controlled by carbon content and tempering conditions. Focusing on transition carbides and interstitial carbon content which are peculiar microstructures to low temperature tempered martensite, microstructure was evaluated by synchrotron radiation X-ray diffraction (SR-XRD). The HER was evaluated by U-bending and fracture surface was observed after the slow strain rate test (SSRT). As the result, the HER was improved and fracture morphology was changed from intergranular to quasi-cleavage when the high carbon content and high temperature tempering were adopted. In the steels improved the HER, the increase of the volume fraction of transition carbides and the decrease of interstitial carbon content was confirmed. Hydrogen trapping by the transition carbides could explain the change of the HER and fracture morphology. These results suggested that the hydrogen trapping by the transition carbides was effective to improve the HER of the low temperature tempering martensitic steels.

scholarly journals Hydrogen Embrittlement Evaluation Methods for Ultra-high Strength Steel Sheets for Automobiles

2010 ◽  
Vol 1 (2) ◽  
pp. 7-13 ◽  
Author(s):  
Shusaku Takagi ◽  
Yuki Toji ◽  
Kohei Hasegawa ◽  
Yasushi Tanaka ◽  
Norbert Roessler ◽  
...  
Keyword(s):  
Hydrogen Embrittlement ◽  
High Strength Steel ◽  
High Strength ◽  
Evaluation Methods ◽  
Steel Sheets ◽  
Ultra High Strength Steel

scholarly journals Comparison of Hydrogen Embrittlement Resistance of High Strength Steel Sheets Evaluated by Several Methods

2016 ◽  
Vol 56 (4) ◽  
pp. 685-692 ◽  
Author(s):  
Shusaku Takagi ◽  
Yukito Hagihara ◽  
Tomohiko Hojo ◽  
Wataru Urushihara ◽  
Kaoru Kawasaki
Keyword(s):  
Hydrogen Embrittlement ◽  
High Strength Steel ◽  
High Strength ◽  
Steel Sheets ◽  
Embrittlement Resistance ◽  
Hydrogen Embrittlement Resistance

scholarly journals Effects of Microalloying on Stretch-flangeability of Ultrahigh-strength TRIP-aided Martensitic Steel Sheets

2014 ◽  
Vol 54 (8) ◽  
pp. 1943-1951 ◽  
Author(s):  
Duc Van Pham ◽  
Junya Kobayashi ◽  
Koh-ichi Sugimoto
Keyword(s):  
Martensitic Steel ◽  
Steel Sheets ◽  
Ultrahigh Strength

Resistance spot weldability of 11Cr–ferritic/martensitic steel sheets

2012 ◽  
Vol 421 (1-3) ◽  
pp. 132-139 ◽  
Author(s):  
Tomoyuki Uwaba ◽  
Yasuhide Yano ◽  
Masahiro Ito
Keyword(s):  
Martensitic Steel ◽  
Resistance Spot ◽  
Steel Sheets
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