摘要
DWTT(落锤撕裂试验)是一种主要用于评价脆性断裂止裂性能的试验方法。实验室在不同条件下轧制了X100管线钢,并按JIS(日本工业标准)和API SPEC 5L/ISO3183标准加工了拉伸试样和DWTT试样,在-20℃条件下进行DWTT并测量DWTT能量和剪切面积。研究了始冷温度对DWTT性能、脆性断口形貌、显微组织及织构的影响。结果表明:X100管线钢DWTT典型的脆性断裂是分离和倾斜断裂,当管线钢形成铁素体和贝氏体双相显微组织时,即产生断口分离;当形成单相贝氏体显微组织时产生倾斜断裂。抑制倾斜断裂和明显的断口分离对提高管线钢的DWTT性能十分重要。
The DWTT（drop weight tear test） is one of the major test methods used to evaluate the crack arrest property of brittle fracture.X100 pipeline steel was rolled in laboratory under different conditions,the tensile specimen and DWTT specimen were prepared in accordance with JIS（Japanese Industry Standards） and API 5L/ISO3183 specifications.The DWTT was carried out at-20℃,and the DWTT energy and shear area were measured.The effects of beginning cooling temperature on DWTT properties,brittle fracture profile,microstructure and texture were investigated.The results showed typical brittle fracture for the DWTT of X100 pipeline steel was separation and slant fracture.When pipeline steel formed ferrite and bainite dual-phase microstructure,separation came into being;when pipeline steel formed bainite single phase,slant fracture came into being.The suppression of slant fracture and remarkable fracture separation is important for improving DWTT properties.
出处
《焊管》
2010年第10期74-79,共6页
Welded Pipe and Tube
