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对16Mn管材在焊肉、基体及熔合线等区域-196℃时平面应变断裂韧性进行了测试,它与常温断裂韧性测试技术相比有以下一些特点。一、低温条件的获得低温槽用2毫米厚钢板焊接而成,外部贴以20毫米厚的聚苯板为隔热层。试验时槽内底部垫上吸足水的棉花或棉丝,注入液氮后形成冰层达到隔热目的。槽内注入液氮获得-196℃,装置如图1所示。为了保证加载时对中,在结构上采用一侧设挡板,前后位
The plane strain fracture toughness of 16Mn pipe was tested at -196 ℃ in welding meat, matrix and fusion line, which has the following characteristics compared with the room temperature fracture toughness test technology. First, the low temperature conditions to obtain cold trough with 2 mm thick steel welded together, the external affixed to 20 mm thick polystyrene board for the insulation layer. During the experiment, the cotton pad or sponge sucking enough water on the bottom of the tank was filled with liquid nitrogen to form an ice layer to achieve the purpose of thermal insulation. The tank was filled with liquid nitrogen to obtain -196 ℃, the device shown in Figure 1. In order to ensure the loading time, using the side of the structure set baffle, before and after bit