[Object] To accurately evaluate delayed fracture characteristics under an environment which is a low-temperature high-humidity and high-chloride environment. [Solution] A method for evaluating a delayed fracture characteristic of a metal material that performs a step including a step (A) and a step (B) below once or a plurality of times to evaluate the delayed fracture characteristic of the metal material having been processed.
Step (A): a step that brings an aqueous solution which includes a chloride ion into contact with a surface of the metal material to cause chloride of 1000 to 100000 mg/m2 in chloride amount to deposit to the surface. Step (B): a step in which the metal material to which the chloride has deposited in the step (A) is left stationary in an air atmosphere at a temperature from -50 to 10°C and at a relative humidity higher than or equal to a deliquescence humidity of the chloride.
                            [目的]在低温高湿高盐度环境下准确评估延迟断裂特性。[解决方案]一种评估
金属材料延迟断裂特性的方法,其步骤包括一次或多次以下的步骤 (A) 和步骤 (B),以评估已加工
金属材料的延迟断裂特性。
步骤(A):将含有
氯离子的
水溶液与
金属材料表面接触,使
氯离子含量在 1000 至 100000 毫克/平方米之间的
氯化物沉积到表面的步骤。步骤(B):将在步骤(A)中沉积了
氯化物的
金属材料静置在空气环境中,温度为-50 至 10°C,相对湿度大于或等于
氯化物的潮解湿度。