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海洋環境中에서 自動車 프레임用 鋼材의 腐蝕疲勞龜裂傳播擧動에 관한 硏究
李相烈(Sang Yoel Lee),林鍾汶(Jong Moon Lim),林祐助(Uh Joh Lim),李鍾樂(Jong Rark Lee) 한국해양공학회 1992 韓國海洋工學會誌 Vol.6 No.2
In this study, corrosion fatigue test of SAPH45 steel was performed by the use of plane bending fatigue tester under marine environment and investigated to surface crack growth behavior of base metal (BM) and heat affected zone (HAZ) of SAPH45.<br/> The main results obtained are as follows :<br/> 1) The more aspect ratio (b/t) of corner crack decreases, the more aspect ratio (b/a) takes greatly effect by corrosion.<br/> 2) The correlation between the stress intensity factor range (ΔK) and crack growth rate (da/dN) for weldment in seawater is given by Paris rule as follow : da/dN=C(ΔK)<SUP>m</SUP><br/> Where m is constant, and the value is 3.82-3.84.<br/> 3) The accelerative factor (α) of BM and HAZ under seawater is about 1.1-1.9, and α of HAZ increases more and more under the low ΔK region.<br/> 4) HAZ is more susceptible to corrosion than BM because of potential of electrode (E<SUB>c</SUB>) of HAZ becomes more less noble potential than that of BM.
Low Cycle Fatigue Properties of GTAWed Alloy 617 at Room Temperature and 800℃
Rando Tungga Dewa,Seon-Jin Kim(김선진),Sang-Yoel Lee(이상열),Woo-Gon Kim(김우곤),Min Hwan Kim(김민환) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
The low cycle fatigue (LCF) properties of Alloy 617 weld joints (WJ) were investigated in the expected operating conditions. The fully reversed LCF tests in a constant strain ratio (R=-1) were carried out in four different total strain controlled and were compared for Alloy 617/Alloy 617 weld joints (WJ) by a gas tungsten arc welding (GTAW) process in air at room temperature and 800oC. The cyclic stress-strain relationship was identified. The fatigue life was decreased when temperature increasing. The fracture behavior was examined in microstructure observations for Alloy 617/Alloy 617 WJ at both temperature conditions. In addition, this material exhibited a transgranular fracture for both temperature conditions cut along the grain boundary (GB).