Coupon Tests of Wire Arc Additively Manufactured Austenitic Stainless Steel in Fire

This paper presents an experimental investigation on the material properties of wire arc additive manufacturing (WAAM) austenitic stainless steel in fire. A total of 26 coupon specimens, extracted parallel and perpendicular to the printing direction, were tested within the temperature range of 22 ℃ (ambient) to 1000 ℃ by the steady-state method. Stress-strain curves were obtained, from which the material properties were extracted, including elastic modulus, 0,2% proof strength, strength at 2,0% total strain, ultimate strength and ultimate strain. Retention factors for them were calculated and compared with those from the design guidelines (EC 3 and SCI). The comparison results show that the predicted retention factors of elastic modulus are generally unconservative compared to the test results, while those for 0,2% proof strength are generally conservative. The predictions of strength at 2,0% total strain and ultimate strength are generally close to test results.