Effect of temperature on the fracture toughness of A516 Gr70 steel

Fracture toughness JIC and KIC tests were performed on A516 Gr70 carbon ste el plate at the temperature ranging from -160 degrees C to 600 degrees C, a nd test results were analyzed according to ASTM E 813 and ASTM E 399. Unloa ding compliance J-integral tests were performed on 1TCT specimens. The rela tion between the J(IC) value and the test temperature was obtained. It was concluded that the temperature ranging from -15 degrees C to 600 degrees C is the upper shelf region of ductile-brittle transition temperature, and in this temperature range, fracture toughness J(IC) values decreased with inc reasing temperature. The ductile brittle transition temperature of the mate rial may be around -30 degrees C. In the region near -30 degrees C, the ten dency of J(IC) to decrease with decreasing temperature was significant.