| Jurnal Angkasa Tahun 2011 Oleh Sudarmanto, Kris Hariyanto |
Laju Perambatan Retak Fatik Baja Tahan Karat Martensitik AISI 420 Setelah mengalami Post-Weld Heat Treatment |
| ABSTRAK |
| The objective of this research is to study fatigue crack growth rates of post weld heat treatment (PWHT) effect to the martensitic stainless steel, welded with the shielded metal arc welding (SMAW) process using the same filler metal chemical composition as base metal. The region coresponding to the base metal, heat affected zone (HAZ) and weld metal were studied. The post weld heat treatment processes were included oil-quenched, quenched with tempered at 600oC/2h, quenched with solution annealed at 950oC/1h and quenched with solution annealed at 950oC/1h continued tempered at 600oC/2h The result of microstructure observation, especialy for solution annealed with tempered heat treatment, was obtained uniform microstructure and without delta ferrite, on the other hand quenched with tempered heat treatment have produced tempered of martensite microstructure. In comparison of crack growth rates to the other heat treatment curves reveal that the fatigue life of solution annealed with tempered heat treatment increase, it has the similar crack growth rate between base metal, HAZ and weld metal. The values of (n) is 2.6618 for base metal, 2.5133 for HAZ and 2.8133 for weld metal and the values of (C) is 3.3823E-10 for base metal, 2.9938E-11 for HAZ and 2.2267E-10 for weld metal. Keywords : martensitik stainless steel, post weld heat treatment, microstructure, fatigu crack growth rate. |
| download |