Experimental Study on the Mechanical Degradation of Q420C Steel Welded Joints after Simulated Fire Exposure
This study investigates the evolution of toughness in Q420C low-alloy steel after simulated fire exposure. Specimens were heated to 200, 400, 600, and 800°C for 30 minutes, followed by either natural cooling or water quenching. Charpy V-notch tests were conducted over a temperature range of −60 to 20°C. Toughness exhib...