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자료유형
학술저널
저자정보
Byoung-Hyun Yoon (Chungnam National University)
저널정보
대한용접·접합학회 대한용접·접합학회지 大韓熔接·接合學會誌 第36卷 第3號
발행연도
2018.6
수록면
38 - 44 (7page)

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The sulfide stress cracking (SSC) resistance of API X65 grade steel weldment has been studied using SSC test in NACE TM-0177 method A and the applied load was 72-108 % of yield strength. The X65 grade pipe steel consisted of fine-grained ferrite and a small volume fraction of pearlite. To investigate the effect of welding process on microstructure and hardness distribution, the submerged arc welding (SAW) were performed with two electrodes. Multi pass SAW for both sides of plates was carried out with a heat input of about 59 kJ/cm -100 kJ/cm. The microstructure of SAW joint was composed with ferrite, pearlite and some M-A constituent. The low carbon thermo-mechanical control process (TMCP) type steel used for SAW showed softening behavior in the HAZ adjacent to base metal. The SSC testing revealed that the API X65 SAW low heat input weld was suitable for sour service, satisfying the NACE requirements. All the specimens failed during or after SSC tests showed that the crack was initiated and propagated along the intercritical heat affected zone (ICHAZ) region as a typical stress oriented hydrogen induced cracking (SOHIC) type. By suppressing softening in the ICHAZ region, the SSC resistance of low carbon TMCP steel welded joints could be more improved.

목차

Abstract
1. Introduction
2. Experimental Procedure
3. Results and Discussion
4. Conclusions
References

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UCI(KEPA) : I410-ECN-0101-2018-581-003168951