Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Zeszyty Naukowe. Mechanika / Politechnika Opolska

2 1999

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: wodór indukowany pękaniem

Sortuj według:

Ogranicz wyniki do:

Physical metallurgy of hydrogen induced cracking in steel for oil country tubular goods (OCTG)

Mazancová E., Wyslych P., Mazanec K.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

1999

z. 59

39-42

Hydrogen induced cracking (HIC) of steel occurs in corrosive environment containing wet hydrogen sulphide. In case of line pipe steel produced from continuously cast slab, HIC parallel to the plate surface occurs in the segregated zone usually at the mind-thickness of plate. In a low pH environment (pH=3,0 - + 3,5), it is impossible to suppress HIC by addition of alloying elements which are so far considered effective for the improvement of hydrogen embrittlement in a higher environment [ 1 , 2 ]. It is know that the microstructure obtained after such heat treatment as quenching and tempering ( uniform carbide distribution in ferritic matrix) is favourable for the prevention of HIC [3 , 4]. The resistance of steel to HIC can be favourable influenced by the application of accelerated cooling (ACC) after controlled rolling (CR), what is very important by the elimination of detrimental microstructural effect due to the formation of segregated zone, usually detected in the mid-thickness of steel plate [ 1 , 2 ]. For this reason, ACC after CR is currently drawing attention as an useful technique for manufacturing line pipe steel [ 5 , 6 ]. This process makes possible to control the achieved microstructure of line pipe steel that possess adequate resistance to HIC. These steels are referred to as sour service grades [ 1 ,2 ]. HIC tests are performed using test solution of a H2S - satured solution containing 5% NaCL plus 0,5% acetig acid (pH=3,0 + - 3,5, NACE-solution) [ 2 , 3 ]. Resistance to HIC will be evaluated in term of HIC crack area ratio (CAR) of the specimen using ultrasonic testing [ 1 , 2 , 6 ].

Hodnocení odolnosti uhlíkových ocelí vůči vodíkem indukovanému praskaní

Sojka J., Hyspecká L., Šmátralová M., Tvrdý M.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

1999

z. 59

27-30