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The effect of colling rate on absorbed hydrogen content of low alloys Cr-Mo-Nb steel = Vliv rychlosti ochlazování na obsah absorbovaného v nízkolegované Cr-Mo-Nb oceli
Gojič, Mirko ; Črnko, Josip ; Kosec, Ladislav
The low alloy Cr-Mo-Nb steel has been studied to determine the effect of4641 cooling rate on the absorbed hydrogen content. Under the industrial condition the billets were hot-rolled in pipes for oil ...country tubular goods. Specimens of 4 mm in diameter and 12 mm in lenght were prepared for heat treatment by dilatometry method. To obtain the various microstructures the heat treatment of specimens was carried out using a high-speed dilatometer Adamel Lhomargy Type LK 02. The martensite microstructure was obtained by quenching of specimens (by blowing of argon) at the average cooling rate of 43oC/s in the temperature range 870 to 500oC. The tempered martensite microstructure was obtained by tempering of specimens at 700oC for 40 min. The pearlite-ferrite microstructure was obtained by means of a solw cooling of specimens at the average cooling rate of 0.1 oC/s by vacum. After heat treatment the specimens were cathodic charged without load in 0.5M H2SO4+10mg/1As2O3 solution at the current densite of 40 mA/cm2 for 60 min. Immediately after the cathodic charging the content of hydrogen was determined by hot vacum extraction method. It was found that the martensite microstructure absorbed 17.0 ppm of hydrogen, while the pearlite-ferrite microstructure absorbed only 4.0 ppm of hydrogen. Thus, these results have shown that the ferrite-pearlite microstructure could be more resistent to the hydrogen embrittlement that the tempered martensite and/or untempered martensite microstructure.
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