Abstract
In this study, estimation of fracture resistance (K1c) was carried out for SS 316 LN welds subjected to various aging conditions. The welds were aged at 370, 475 and 550 °C and for 1000-20,000 h durations and were tested at room temperature (RT), 380 and 550 °C. Tensile properties and J-R curves were established for SS 316 LN welds after aging treatments at all test temperatures. Decrease in total elongation was observed after 20,000 h aging durations for all aging temperatures and all test temperatures, compared to as weld condition. From J-R curves, J1c values and equivalent Kj1c values were determined. Decrease in J1c was observed after 20,000 h aging durations for all aging temperatures at all test temperatures. Based on previously proposed model, an attempt was made to estimate fracture resistance (K1c) from tensile properties. Estimation of K1c was carried out for aged welds, including as weld condition at three temperatures. Estimated K1c values were within 1-30 % of the determined fracture toughness values. K1c estimation was also applied for similar type of austenitic stainless steel welds. It is summarized that previous methodology of K1c estimation is applicable for austenitic stainless steel welds.
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