体心立方金属韧脆转变机制研究进展

韩卫忠, 卢岩, 张雨衡

Mechanism of Ductile-to-Brittle Transition in Body-Centered-Cubic Metals：A Brief Review

HAN Weizhong, LU Yan, ZHANG Yuheng

图1 韧脆转变温度(DBTT)的测试方法[3,16,34,56]

Fig.1 Different methods for measuring the ductile-to-brittle transition temperature (DBTT) (a) DBTT measured by Charpy test[56] (L is longitudinal, T is long transverse, and S is short transverse. The first letter (L or T) designates the direction normal to the crack plane, and the second letter (S) the expected direction of crack propagation) (b) DBTT measured by bending test[3] (Filled symbols represent fracture toughnesses (left axis-K), and open symbols represent stresses at failure, which are normalized by crack length (a) for compatibility with the fracture toughness scale (right axis-σf(a)) (c) DBTT measured by small-punch (SP) test (TSP)[34] (d) DBTT measured by nanoindentation[16]