文献类型：期刊文献

中文题名：9Ni钢焊接接头的力学性能与失效评定曲线

英文题名：Mechanical Properties and Failure Assessment Curves of 9Ni Steel Welded Joint

作者：刘长军[1,2];龚伟忠[1,2];曾鑫[1,2];徐秀清[3];刘俊杰[1,2];谈建平[1,2]

机构：[1]华东理工大学承压系统与安全教育部重点实验室,上海200237;[2]华东理工大学机械与动力工程学院,上海200237;[3]中国石油天然气集团公司石油管工程技术研究院,西安710000

年份：2022

卷号：46

期号：8

起止页码：28

中文期刊名：机械工程材料

外文期刊名：Materials For Mechanical Engineering

收录：CSTPCD;;北大核心:【北大核心2020】；CSCD:【CSCD_E2021_2022】；

基金：国家重点研发计划项目(2018YFC0808800);国家自然科学基金资助项目(52075174,11502082)。

语种：中文

中文关键词：9Ni钢;焊接接头;力学性能;失效评定曲线;液化天然气

外文关键词：9Ni steel;welded joint;mechanical property;failure assessment curve;liquefied natural gas

摘要：通过试验获得9Ni钢焊接接头、母材和焊缝在室温20℃和低温-158℃下的拉伸和断裂性能,对比分析了温度对性能的影响;建立了母材和焊缝的近似R6选择2失效评定曲线(FAC)以及9Ni钢焊接接头的FAC,并进行了对比。结果表明:低温下母材的拉伸和断裂性能以及接头和焊缝的拉伸性能均高于室温下,焊缝的断裂韧度几乎不随温度改变;不同温度下焊缝的屈服强度和断裂韧度均低于母材,焊缝是9Ni钢焊接接头的薄弱区域。由室温拉伸性能构建的近似选择2 FAC包络面积均略小于采用低温拉伸性能构建的FAC,故可用室温拉伸性能构建近似选择2 FAC对9Ni钢焊接接头进行安全评定;分段选取室温下母材和焊缝的近似选择2 FAC构建的焊接接头FAC能最保守地对低温9Ni钢含缺陷结构进行安全评定。
The tensile and fracture properties at 20 ℃ room temperature and-158 ℃ low temperature of 9 Ni steel welded joint, base metal and weld were obtained by experiments, and the effects of temperature on the properties were compared and analyzed. Approximate R6 option 2 failure assessment curves(FAC) for the base metal and weld, as well as FAC for the 9 Ni steel welded joint were established and compared. The results show that the tensile and fracture properties of the base metal and the tensile properties of the joint and weld at low temperature were higher than those at room temperature, but the fracture toughness of the weld hardly changed with temperature. The yield strength and fracture toughness of the weld at different temperatures were lower than those of the base metal, and the weld was a weak area of the 9 Ni steel welded joint. The envelope area of the approximate option 2 FAC constructed with room temperature tensile properties was slightly smaller than that with low temperature tensile properties, so the approximate option 2 FAC constructed with room temperature tensile properties can be used for safety evaluation of 9 Ni steel welded joints. The FAC of 9 Ni steel welded joint constructed by segment selection of the approximate option 2 FACs of the base metal and weld at room temperature can be used for safety evaluation of 9 Ni steel defect-containing structures at low temperatures in the most conservative way.