1180 MPa级超高强度汽车薄板钢的延迟断裂性能
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摘要
利用U型弯曲试验研究了3种1180 MPa级超高强汽车薄板钢的延迟断裂性能。结果表明,DP1180钢的组织主要为马氏体+铁素体;MS1180钢的组织主要为马氏体+少量铁素体;QP1180钢的组织主要为马氏体、铁素体和少量残留奥氏体。DP1180钢的抗延迟断裂性能最好,其次是MS1180钢,QP1180钢的抗延迟断裂性能最差。此外,组织对试验钢的延迟断裂性能有重要影响,马氏体的含量和形貌、残留奥氏体含量都会影响钢的延迟断裂性能。
The U-bent experiment was adopted for investing the delayed fracture properties of three 1180 MPa ultra high-strength steel sheets. The results show that the microstructure of DP1180 steel is martensite and ferrite. The microstructure of MS1180 steel is martensite and a little ferrite. The microstructure of QP1180 steel is martensite,ferrite and a little retained austenite. The best of anti-delayed fracture resistance is DP1180 steel. The worst of anti-delayed fracture resistance is QP1180 steel. In addition,the microstructures have important influence on the delayed fracture property of the best steels. The content and morphology of martensite and the content of retained austenite all affect the delayed fracture properties of the steels.
The U-bent experiment was adopted for investing the delayed fracture properties of three 1180 MPa ultra high-strength steel sheets. The results show that the microstructure of DP1180 steel is martensite and ferrite. The microstructure of MS1180 steel is martensite and a little ferrite. The microstructure of QP1180 steel is martensite,ferrite and a little retained austenite. The best of anti-delayed fracture resistance is DP1180 steel. The worst of anti-delayed fracture resistance is QP1180 steel. In addition,the microstructures have important influence on the delayed fracture property of the best steels. The content and morphology of martensite and the content of retained austenite all affect the delayed fracture properties of the steels.
引文
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[5]张永健.超高强度薄板钢的氢致延迟断裂行为研究[D].北京:钢铁研究总院,2013.
[6]Sykes C,Burton H,Gegg C.Crack propagation of high strength steels in a gaseous hydrogen atmosphere[J].Journal of Iron Steel Institute,1947,156:155.