众所周知,工程上常用的结构钢具有冷脆现象,即试验温度低于某一温度T_k时,材料将从韧性状态转为脆性状态,其冲击值明显下降,这种现象称为冷脆。温度T_k称为材料的冷脆转变温度,或称为韧脆转变温度。 评定金属材料冷脆转变温度的方法,主要有两种:能量法和断口法。这两种方法都 As we all know, structural steel commonly used in engineering have a cold brittle phenomenon, that is, when the test temperature is below a certain temperature T_k, the material will change from the ductile state to the brittle state, and its impact value decreases obviously. This phenomenon is called cold brittleness. The temperature T_k is called the cold brittle transition temperature of the material, or the ductile-brittle transition temperature. There are two main methods to evaluate the cold-brittle transition temperature of metallic materials: energy method and fracture method. Both methods are