1180 MPa级超高强钢慢速率拉伸延迟开裂性能
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摘要
针对DP1180和QP1180两种超高强度汽车用钢板,通过微观组织分析和慢应变速率拉伸试验(SSRT)研究了这两种1180 MPa级超高强汽车钢的延迟开裂性能。试验结果表明,DP1180钢的微观组织为马氏体+铁素体,QP1180钢的微观组织为马氏体+铁素体+少量残余奥氏体。试验钢的延迟开裂性能用其在0. 1 mol·L~(-1)的HCl介质中与空气介质中的力学性能指标的比值表示。QP1180钢断裂时间、断面收缩率、断后伸长率、抗拉强度的比值均低于DP1180钢,说明0. 1 mol·L~(-1)的HCl介质对QP1180钢力学性能指标影响更大些,其延迟开裂的敏感性更高。
For ultra-high strength automotive steel DP1180 and QP1180 sheets,their delayed fracture properties were studied by microstructural analysis and slow strain rate tension test( SSRT). The results show that the microstructures of DP1180 steel are martensite and ferrite,and the microstructures of QP1180 steel are martensite,ferrite and a small amount of retained austenite. The delayed fracture behavior of test steel is expressed by the ratio of mechanical properties in 0. 1 mol·L~(-1) HCl medium to air medium. The fracture time,section shrinkage,elongation after fracture and the tensile strength ratio of QP1180 steel are lower than that of DP1180 steel,which shows that 0. 1 mol·L~(-1) HCl medium has more influence on the mechanical properties of QP1180 steel,and its sensitivity to delayed cracking is higher.
For ultra-high strength automotive steel DP1180 and QP1180 sheets,their delayed fracture properties were studied by microstructural analysis and slow strain rate tension test( SSRT). The results show that the microstructures of DP1180 steel are martensite and ferrite,and the microstructures of QP1180 steel are martensite,ferrite and a small amount of retained austenite. The delayed fracture behavior of test steel is expressed by the ratio of mechanical properties in 0. 1 mol·L~(-1) HCl medium to air medium. The fracture time,section shrinkage,elongation after fracture and the tensile strength ratio of QP1180 steel are lower than that of DP1180 steel,which shows that 0. 1 mol·L~(-1) HCl medium has more influence on the mechanical properties of QP1180 steel,and its sensitivity to delayed cracking is higher.
引文
[1]Kim J S,Lee Y H,Lee D L,et al.Microstructural influences on hydrogen delayed fracture of high strength steels[J].Materials Science&Engineering A,2009,505(1):105-110.
[2]Gu J L,Chang K D,Fang H S,et al.Delayed fracture properties of 1500 MPa bainite/martensite dual-phase high strength steel and its hydrogen traps[J].ISIJ International,2002,42(12):1560-1564.
[3]褚武扬.氢损伤与滞后断裂[M].北京:冶金工业出版社,2000.Chu W Y.Hydrogen Damage and Delayed Fracture[M].Beijing:Metallurgical Industry Press,2000.
[4]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.Zhang Y J.Study on Hydrogen Delayed Fracture Behaviour of Ultra-High Strength Steel Sheets[D].Beijing:Iron and Steel Research Institute,2013.
[5]Chida T,Hagihara Y,Akiyama E,et al.Comparison of constant load,SSRT and CSRT methods for hydrogen embrittlement evaluation using round bar specimens of high strength steels[J].Tetsuto-Hagane,2014,100(10):1298-1305.
[6]Wang M,Akiyama E,Tsuzaki K.Effect of hydrogen on the fracture behavior of high strength steel during slow strain rate test[J].Corrosion Science,2007,49(11):4081-4097.
[7]余海燕,蒋忠伟.A柱加强板热冲压延迟开裂机理[J].锻压技术,2017,42(3):40-44.Yu H Y,Jiang Z W.Mechanism of delayed fracture for A-pillar in hot stamping[J].Forging&Stamping Technology,2017,42(3):40-44.
[8]GB/T 228.1-2010,金属材料拉伸试验第1部分:室温试验方法[S].GB/T 228.1-2010,Metallic materials-Tensile testing-Part 1:Method of test at room temperature[S].
[9]濮振谦,林建平,叶又,等.QP980和DP980高强钢板的抗延迟断裂性能[J].锻压技术,2017,42(4):153-158.Pu Z Q,Lin J P,Ye Y,et al.Delayed fracture resistance performance for high strength steel sheet QP980 and DP980[J].Forging&Stamping Technology,2017,42(4):153-158.
[10]代启锋,宋仁伯,范午言,等.DP1180双相钢在高应变速率变形条件下应变硬化行为及机制[J].金属学报,2012,48(10):1160-1165.Dai Q F,Song R B,Fan W Y,et al.Behavior and mechanism of strain hardening for dual phase DP1180 under high strain rate dfformation[J].Acta Metallurgica Sinica,2012,48(10):1160-1165.
[11]万荣春,付立铭,王学双,等.980 MPa级汽车薄板钢拉深冲杯延迟开裂性能的研究[J].热加工工艺,2017,46(18):54-56.Wan R C,Fu L M,Wang X S,et al.Study on deep drawing delayed fracture properties of 980 MPa steel thin sheets for automotive[J].Hot Working Technology,2017,46(18):54-56.
[12]Wang M,Tasan C C,Koyama M,et al.Enhancing hydrogen embrittlement resistance of lath martensite by introducing nano-films of interlath austenite[J].Metallurgical and Materials Transactions A,2015,46(9):3797-3802.
[2]Gu J L,Chang K D,Fang H S,et al.Delayed fracture properties of 1500 MPa bainite/martensite dual-phase high strength steel and its hydrogen traps[J].ISIJ International,2002,42(12):1560-1564.
[3]褚武扬.氢损伤与滞后断裂[M].北京:冶金工业出版社,2000.Chu W Y.Hydrogen Damage and Delayed Fracture[M].Beijing:Metallurgical Industry Press,2000.
[4]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.Zhang Y J.Study on Hydrogen Delayed Fracture Behaviour of Ultra-High Strength Steel Sheets[D].Beijing:Iron and Steel Research Institute,2013.
[5]Chida T,Hagihara Y,Akiyama E,et al.Comparison of constant load,SSRT and CSRT methods for hydrogen embrittlement evaluation using round bar specimens of high strength steels[J].Tetsuto-Hagane,2014,100(10):1298-1305.
[6]Wang M,Akiyama E,Tsuzaki K.Effect of hydrogen on the fracture behavior of high strength steel during slow strain rate test[J].Corrosion Science,2007,49(11):4081-4097.
[7]余海燕,蒋忠伟.A柱加强板热冲压延迟开裂机理[J].锻压技术,2017,42(3):40-44.Yu H Y,Jiang Z W.Mechanism of delayed fracture for A-pillar in hot stamping[J].Forging&Stamping Technology,2017,42(3):40-44.
[8]GB/T 228.1-2010,金属材料拉伸试验第1部分:室温试验方法[S].GB/T 228.1-2010,Metallic materials-Tensile testing-Part 1:Method of test at room temperature[S].
[9]濮振谦,林建平,叶又,等.QP980和DP980高强钢板的抗延迟断裂性能[J].锻压技术,2017,42(4):153-158.Pu Z Q,Lin J P,Ye Y,et al.Delayed fracture resistance performance for high strength steel sheet QP980 and DP980[J].Forging&Stamping Technology,2017,42(4):153-158.
[10]代启锋,宋仁伯,范午言,等.DP1180双相钢在高应变速率变形条件下应变硬化行为及机制[J].金属学报,2012,48(10):1160-1165.Dai Q F,Song R B,Fan W Y,et al.Behavior and mechanism of strain hardening for dual phase DP1180 under high strain rate dfformation[J].Acta Metallurgica Sinica,2012,48(10):1160-1165.
[11]万荣春,付立铭,王学双,等.980 MPa级汽车薄板钢拉深冲杯延迟开裂性能的研究[J].热加工工艺,2017,46(18):54-56.Wan R C,Fu L M,Wang X S,et al.Study on deep drawing delayed fracture properties of 980 MPa steel thin sheets for automotive[J].Hot Working Technology,2017,46(18):54-56.
[12]Wang M,Tasan C C,Koyama M,et al.Enhancing hydrogen embrittlement resistance of lath martensite by introducing nano-films of interlath austenite[J].Metallurgical and Materials Transactions A,2015,46(9):3797-3802.