<i>ε</i>→<i>γ</i> Reverse Transformation-induced Hydrogen Desorption and Mn Effect on Hydrogen Uptake in Fe–Mn Binary Alloys

Abstract

The effects of ε-martensite and Mn on hydrogen uptake and desorption were investigated through cryogenic thermal desorption analysis. Increasing Mn content promoted hydrogen uptake, and reverse transformation from ε to γ phases induced hydrogen desorption.

STAR-FORMING BLUE ETGS IN TWO NEWLY DISCOVERED GALAXY OVERDENSITIES IN THE HUDF ATz= 1.84 AND 1.9: UNVEILING THE PROGENITORS OF PASSIVE ETGS IN CLUSTER CORES

“…These systems show large fractions (≈ 50%) of star-forming galaxies, indicating that most of the quenching of star formation observed at lower redshift had not yet occurred (Tran et al 2010;Fassbender et al 2011;Hayashi et al 2011;Tadaki et al 2012;Zeimann et al 2012;Brodwin et al 2013). Recent observations at these redshifts also suggest that the specific star formation of galaxies in dense regions becomes higher than that in the field, although not all results are consistent with the supposed reversal of the star-formation density relation (Elbaz et al 2007;Cooper et al 2008;Grützbauch et al 2011;Popesso et al 2012;Andreon 2013;Gobat et al 2013;Koyama et al 2013;Strazzullo et al 2013;Santos et al 2014;Scoville et al 2013;Tanaka et al 2013;Ziparo et al 2013).…”

Martensitic transformation-induced hydrogen desorption characterized by utilizing cryogenic thermal desorption spectroscopy during cooling

“…Thermal desorption spectroscopy (TDS) is one of the well-known, sensitive methods of detecting diffusible hydrogen species [7][8][9], which play an important role on the hydrogen embrittlement [10,11]. In fact, extra hydrogen desorption due to reverse transformation from ε-martensite to austenite has been recently detected by TDS [12]. However, the real objective is the hydrogen desorption caused by the forward transformation, since the TRIP effect originates from the forward martensitic transformation.…”

“…To investigate hydrogen desorption due to the thermally induced martensitic transformation, the related TDS measurements must be performed during cooling to a cryogenic temperature, which is below the starting temperature for martensitic transformation (M s ). In recent years, a cryogenic TDS technique (CTDS) has been developed to measure hydrogen desorption rates at cryogenic temperatures [12,13]. Utilization of the C-TDS can be a new tool for studying hydrogen desorption due to the thermally induced martensitic transformation.…”

Improved Accuracy of Thermal Desorption Spectroscopy by Specimen Cooling during Measurement of Hydrogen Concentration in a High-Strength Steel

“…The process described in standard BS ISO 3690 is used to store samples up to 15 days before the hydrogen measurement [19,23,24]. In order to study the hydrogen diffusivity and trapping at low temperatures, the cryogenic-TDS technique (C-TDS) was developed [25,26]. Use of C-TDS for measurement of hydrogen in Fe-C alloy revealed the hydrogen thermal desorption starting at 173 K to room temperature (RT), associated preferably with the hydrogen trapping in solid solution, at dislocations and grain boundaries [27].…”