TY - JOUR ID - 20677 TI - Evaluation of microstructural effects on mechanical properties of CT80 grade coiled tubing steel JO - Scientia Iranica JA - SCI LA - en SN - 1026-3098 AU - Ghiasi, Hasan AD - Technology Development Institute, ACECR, Tehran, Iran Y1 - 2018 PY - 2018 VL - 25 IS - 4 SP - 2155 EP - 2161 KW - CT80 Grade Coiled Tubing Steel KW - microstructure KW - Heat treatment KW - mechanical properties KW - Fatigue life DO - 10.24200/sci.2018.20677 N2 - The microstructure formation and mechanical properties of coiled tube CT80 grade steel was investigated with different heat treatments. Optical Microscopy (OM) and Scanning Electron Microscopy (SEM) were used to evaluate the microstructure. Acicular ferrite, polygonal and quasi-polygonal ferrite, granular bainite, martensite, pearlite, and small Martensite-Austenite (MA) islands with the banding structure were revealed in original and heat treated samples. In order to assess the effect of grain size and microstructure, mechanical properties were evaluated by hardness, charpy impact, tensile, and fatigue life tests. The best mechanical properties by tensile and fatigue test is obtained from the normalized specimen with the grain size of ASTM 13. UR - https://scientiairanica.sharif.edu/article_20677.html L1 - https://scientiairanica.sharif.edu/article_20677_964e4417f106ef880697d0a8f349ed82.pdf ER -