| | SLO | ENG | Cookies and privacy

Bigger font | Smaller font

Show document

Title:Primerjava sočasnih meritev elektrokemijskega šuma in mehanskih parametrov med procesi napetostno-korozijskega pokanja
Authors:Bajt Leban, Mirjam (Author)
Doleček, Valter (Author)
Legat, Andraž (Author)
Kuhar, Viljem (Author)
Files:.pdf Materiali_in_tehnologije_2000_Bajt_Leban_et_al._Comparison_between_simultaneously_performed_measurements_of_electrochemical_noise_and_me.pdf (1,27 MB)
 
URL http://mit.imt.si/Revija/izvodi/mit0012/06leban.pdf
 
Language:Slovenian
Work type:Scientific work (r2)
Typology:1.01 - Original Scientific Article
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:Namen našega dela je bil določiti značilnosti elektrokemijskega šuma, povzročenega z napetostno-korozijskim pokanjem. Želeli smo predvsem ugotoviti poveznanost značilnih elektrokemijskih fluktuacij z mehanskimi spremembami zaradi procesov pokanja ter tako posredno tudi oceniti primernost te metode za detekcijo in študij različnih oblik pokanja. Elektrokemijski šum smo merili med počasnim enakomernim nateznim obremenjevanjem delovne elektrode (modificiran Slow Strain Rate Test), izdelane iz nerjavnega avstenitnega jekla tipa AISI 304 v žarjenem ter toplotno neobdelanem stanju. Izrazite nenadne fluktuacije napetostnega in tokovnega šuma smo opazili po preseženi napetosti tečenja. Vse se časovno popolnoma ujemajo z nenadnimi spremembami raztezka natezno obremenjene elektrode, kar dokazuje zanesljivo možnost detekcije pokanja. Iz izmerjenih sprememb raztezka smo določili hitrost rasti razpok ter jih primerjali z amplitudami fluktuacij elektrokemijskega šuma. Dokazali smo, da obstaja med vrednostmi teh dveh količin linearna odvisnost. Poudariti je treba, da samo poznanje elektrokemijskih razmer ter spremljanje mehanskih sprememb, povzročenih s pokanjem, še ni dovolj za ovrednotenje mehanizmov napetostno-korozijskega pokanja, pač pa bo za to v prihodnosti treba vključiti še fraktografsko analizo prelomnih površin.
Keywords:elektrokemijski šum, napetostno-korozijsko pokanje, interkristalna korozija, vodikova krhkost, hitrost pokanja, metalografska analiza
Year of publishing:2000
Publisher:Inštitut za kovinske materiale in tehnologije
Number of pages:str. 37-41
Numbering:št. 1/2, Letn. 34
ISSN:1580-2949
UDC:620.193:669.14.018.8:541.13
ISSN on article:1580-2949
COBISS_ID:213162 Link is opened in a new window
NUK URN:URN:SI:UM:DK:MIKUWFBB
Views:438
Downloads:55
Metadata:XML RDF-CHPDL DC-XML DC-RDF
Categories:Misc.
:
  
Average score:(0 votes)
Your score:Voting is allowed only for logged in users.
Share:AddThis
AddThis uses cookies that require your consent. Edit consent...

Hover the mouse pointer over a document title to show the abstract or click on the title to get all document metadata.

Record is a part of a journal

Title:Materiali in tehnologije
Shortened title:Mater. tehnol.
Publisher:Inštitut za kovinske materiale in tehnologije
ISSN:1580-2949
COBISS.SI-ID:106193664 New window

Secondary language

Language:English
Title:Comparison between simultaneously performed measurements of electrochemical noise and mechanical parameters during stress-corrosion processes
Abstract:The main aim of the research work was to asses basic characteristics of electrochemical noise generated by stress-corrosion cracking, and especially to find a correlation between the electrochemical and mehanical quantities. Electrochemical noise was measured during slow constant increasing of stress (modified Slow Strain Rate Test) on tensile tube made from austenitic stainless steel of the type AISI 304, in sensitized and nonsensitized condition. One of the objectives of this research was to investigate the possibility of electrochemical noise method for studying stress-corrosion processes. After the reaching yielding point, voltage and current spikes, as well as elongation transients, all appearing at the same time, were detected. Afterwards, the cracking velocities were determined from the time series of elongation, and compared to characteristic parameters of the measured electrochemical noise. The results of the comparision indicated that the amplitudes of the electrochemical noise spikes are lineary dependent upon cracking velocity. It has to be pointed out, that the knowledge of elecrochemical conditions and mechanical changes generated by cracking processes by themselves, cannot form revalant information concering the cracking mechanisms. In order to get better overview to this problem additional fractographic inspections of cracking surfaces has to be performed.
Keywords:electrochemical noise, stress corrosion cracking, SSC, intergranular corrosion, hydrogen enbrittlement, cracking velocity, metallography


Comments

Leave comment

You have to log in to leave a comment.

Comments (0)
0 - 0 / 0
 
There are no comments!

Back
Logos of partners University of Maribor University of Ljubljana University of Primorska University of Nova Gorica