Hydrogen Embrittlement Control of Metallic Screws after the Surface Treatments by Wedge Test

• Autorzy: Bezecný J. , Šišáková J. , Bakošová D.
• Konferencja: Polish-Slovak Scientific Conference on Machine Modeling and Simulation - MMS 2010 (15 ; 31.08-1.09.2010 ; Krasiczyn, Poland)
• Języki publikacji: EN

Abstrakty

EN

By surface treatments can occur so called hydrogen embrittlement, which is proving the cracking of joining pieces. Embrittlement on the critical value is predicated by several factors and therefore is important the concretization to admit the effective curative proceeding. Most parts produced of construction steels are exposed not only the mechanical straining but also the action of aggressive environment during its service. Common used protection is the galvanic metallization. However it impending degradation dangerous of useful properties so called hydrogen embrittlement by the surface treatments. By this time doesn't exist the definitive explanation what mechanism causes the hydrogen degradation of useful properties. At the same time is not achieved the efficiency of technologically precautions the eliminated the possibly degradation of useful properties parts influenced by hydrogen. The purpose of this paper was to verify and practically realized the method of steel hydrogenization control after the heat treatment according to ISO/DIS 10587. The test apparatus comprise of the steel wedge by angle of 6° and the filling steel plate. The test consists of screw tightening on moment, its cracks controlling and observing of number of hours leading to fracture. The experimental confirmed that the method of inclined wedge is an applicable method for material hydrogenization process on the critical value. The advantage is for state if the screws of same production runs are applicable by this standard, there can be fitted into a processing. By materials tests were occurred that for hydrogen process on critical value has the most influence the bating process realized before the surface treatments. However, after this operation is impossible the dehydrogenization of parts. The meaningful influence has also the radiuses in the critical parts which can affect as the notches and stress raisers.

Słowa kluczowe

EN

cracking of joining pieces; steel hydrogenization control; dehydrogenization; wedge test; surface treatments

PL

kruchość wodorowa; Test Wedge; zabiegi powierzchniowe

• Wydawca: Oficyna Wydawnicza Politechniki Warszawskiej
• Czasopismo: Machine Dynamics Research
• Rocznik: 2010
• Tom: Vol. 34, No. 3
• Strony: 21--28
• Opis fizyczny: Bibliogr. 6 poz., il., wykr.

Twórcy

autor

Bezecný J.

autor

Šišáková J.

autor

Bakošová D.

• Alexander Dubcek University in Trencin, Faculty of Industrial Technologies and materials in Púchov, Slovak Republic,

Bibliografia

• Bezecný, J., 2008, Fraktograficka metoda stanovenia navodfkovania oceli pri povrchovych upravach, Bulletin A TZK, 16, 1, 1-6.
• Bezecný, J., Kučerová, J., 2006, Fractographical method of steel embrittlement identification by galvanic metallization, XI International conference COSIM2006, Krynica Zdrój.
• ISO/DIS 10587, 1994, Kovove a ine anorganicke povlaky - Skuśky na zvyskovu krehkosf prekovove - povlakovane skrutky so zavitom, spojovacie skrutky a tyce - Metoda śikmeho klina.
• Jansen, J., Preiksacht, P., 2002, Vodikove kfehnuti (online), ĆR, http://www.surtec.sk/pdf/TD%208-Vodikove%20krehnuti.pdf
• Sojka, J., 2007, Odolnost ocelí vůči vodíkové kfehkosti, Ostrava:Vysoka skola bańska-technicka univerzita, 13-17, 36-49.
• STN EN 10083-1, 1996, Heat - treatable steels.