摘要
止裂韧性是管线钢的一项重要性能指标,准确测定钢管的止裂韧性对于保证管线的安全运行具有重要意义。为此,采用不同温度下的落锤撕裂试验(Drop Weight Tear Test,DWTT)研究了人字形和压制V形2种缺口X100钢管的能量特征,从吸收能、断口剪切面积、总吸收能、起裂能和扩展能等方面对其能量进行了表征和分析,同时进行了不同温度下的夏比V形(Charpy V-type Notch,CVN)冲击试验,对比分析了不同缺口类型X100钢管DWTT能量密度与CVN能量密度的变化。结果表明:相对于人字形缺口试样,压制V形缺口试样的总吸收能较高,韧脆转变温度较低,能量密度较高,扩展能与总吸收能之比较低,总吸收能和扩展能对温度较为敏感,起裂能则对温度不敏感;起裂能量密度、扩展能量密度与总能量密度之间,以及起裂能量密度与CVN总能量密度之间具有线性关系;相对于CVN冲击试验,DWTT所得到的韧脆转变温度较高。通过DWTT与CVN的对比分析,推荐采用Battelle能量关系式来建立DWTT与CVN的能量关系。
The accurate determination of the crack arrest toughness, an important property of a line pipe, is of a vital significance to the guarantee of safe operation of pipelines. The energy features of X100 line pipes with Chevron Notch （CN） and Pressed V-type Notch （PN） were investigated by the Drop Weight Tear Test （DWTT） under different temperatures in the following aspects： absorption energy, shear fracture area, total absorbed energy, fracture initiation energy, and propagation energy. The variations of the DWTT energy density and Charpy V-type Notch （CVN） energy density were compared among X100 line pipes with different notches through the CVN impact tests under different temperatures. The following results were obtained. First, compared with CN speci- mens, PN specimens have higher total fracture energy, lower ductile to-brittle transition temperature, higher energy density, lower ratio of propagation energy to total energy. Second, the total fracture energy and propagation energy can be more sensitive to temper ature, but fracture initiation energy is not sensitive to temperature. Third, the linear relationship exists not only between the initiation energy density, propagation energy density and total energy density, but between the initiation energy density and CVN total energy density. Fourth, the ductile-to brittle transition temperature from DWTT is higher than that from CVN. Through a comparative analysis between DWTT and CVN, the Battelle energy relation was recommended suitable for the establishment of the DWTT and CVN energy relationship.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2014年第6期111-116,共6页
Natural Gas Industry
基金
国家自然科学基金项目(编号:51174165)
国家科技支撑计划项目(编号:2011BAE35B01)
关键词
人字形缺口
压制V形缺口
X100钢管
落锤撕裂试验
夏比冲击能
起裂能
扩展能
韧脆转变温度
Chevron Notch, Pressed Notch, X100 line pipes, drop weight tear test （DWTT）, Charpy impact energy, initiation energy, propagation energy, ductile-to-brittle transition temperature
