含Ni高强度螺栓钢氢致延迟断裂行为研究
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摘要
采用恒载荷缺口拉伸延迟断裂试验研究了一种新型含Ni高强度螺栓钢在pH=3.5Walpole溶液中的氢致延迟断裂行为,并与未加Ni钢进行了对比。结果表明,与未加Ni钢相比,添加1%(质量分数)Ni钢的氢致延迟断裂抗力明显提高,提高幅度约10%,从而显著降低了延迟断裂试样裂纹源区沿晶断裂所占比例。另外,添加1%Ni还能显著降低试验钢在pH=3.5Walpole溶液中浸泡100 h后吸附的氢量、腐蚀坑深度及腐蚀速率。电化学极化曲线测定表明,1%Ni元素的添加能使试验钢的腐蚀电位正移,提高点蚀抗力。因此,腐蚀抗力提高以及锈层中Ni的富集而使得吸附的氢量减少,是含Ni试验钢耐延迟断裂性能得到改善的主要原因。
Hydrogen-induced delayed fracture behavior of a newly developed Ni-bearing high strength bolt steel was investigated using constant load delayed fracture test with notched specimen in a pH = 3. 5 Walpole solution,and compared to a Ni-free high strength bolt steel. The results showed that compared to the Ni-free steel,the hydrogen induced delayed fracture resistance of the steel with1% Ni by mass was obviously improved by about 10%,thus,the proportion of brittle intergranular fraction in crack initiation area of the delayed fracture specimens was significantly reduced. Further investigation revealed that the absorbed hydrogen content,corrosion pit depth and corrosion rate in pH = 3. 5 Walpole solution all notably decreased due to the addition of 1% Ni. Electrochemical polarization test revealed that the addition of 1% Ni caused the value of open circuit potential to be more positive and thus enhanced pitting corrosion resistance. It was thus concluded that the addition of 1% Ni could enhance the delayed fracture resistance of the tested high strength bolt steel mainly owing to the enhanced corrosion resistance and the decreased amount of absorbed hydrogen due to the enrichment of Ni in the rust layer.
Hydrogen-induced delayed fracture behavior of a newly developed Ni-bearing high strength bolt steel was investigated using constant load delayed fracture test with notched specimen in a pH = 3. 5 Walpole solution,and compared to a Ni-free high strength bolt steel. The results showed that compared to the Ni-free steel,the hydrogen induced delayed fracture resistance of the steel with1% Ni by mass was obviously improved by about 10%,thus,the proportion of brittle intergranular fraction in crack initiation area of the delayed fracture specimens was significantly reduced. Further investigation revealed that the absorbed hydrogen content,corrosion pit depth and corrosion rate in pH = 3. 5 Walpole solution all notably decreased due to the addition of 1% Ni. Electrochemical polarization test revealed that the addition of 1% Ni caused the value of open circuit potential to be more positive and thus enhanced pitting corrosion resistance. It was thus concluded that the addition of 1% Ni could enhance the delayed fracture resistance of the tested high strength bolt steel mainly owing to the enhanced corrosion resistance and the decreased amount of absorbed hydrogen due to the enrichment of Ni in the rust layer.
引文
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[14]李阳,张永健,惠卫军,等.高强度钢42Cr Mo VNb的氢致延迟断裂行为[J].钢铁研究学报,2011,23(12):35-39,59.
[15]YOSHIO Y,MINOZAKI Y.Sulfide stress cracking resistance of low-alloy nickel steels[J].Corrosion,1986,42(4):222-233.
[16]SHIMOTSUSA M,IBARAKI N,IKEDA T,et al.Wire rod for suspension spring with excellent corrosion fatigue life[J].Wire Journal International,1998(3):78-83.
[17]孙曼丽,惠卫军,张代明,等.Ni对中碳高强度弹簧钢腐蚀疲劳性能的影响[J].特殊钢,2008,29(4):52-54.
[2]HAM J O,JANG Y H,LEE G P,et al.Evaluation method of sensitivity of hydrogen embrittlement for high strength bolts[J].Materials Science&Engineering A,2013,581(10):83-89.
[3]惠卫军,翁宇庆,董瀚.高强度紧固件用钢[M].北京:冶金工业出版社,2009.
[4]胡杰,邹定强,杨其全.铁路用20Mn Ti B高强度螺栓的断裂失效分析[J].金属热处理,2017,42(7):185-188.
[5]OMURA T.Hydrogen entry and its effect on delayed fracture susceptibility of high strength steel bolts under atmospheric corrosion[J].ISIJ International,2012,52(2):267-273.
[6]李阳,张永健,惠卫军,等.1 500 MPa级高强度钢42Cr Mo VNb的氢吸附行为[J].金属学报,2011,47(4):423-428.
[7]HAGIHARA Y,SHOBU T,HISAMORI N,et al.Delayed fracture using CSRT and hydrogen trapping characteristics of Vbearing high-strength steel[J].ISIJ International,2012,52(2):298-306.
[8]BHADESHIA H K D H.Prevention of hydrogen embrittlement in steels[J].ISIJ International,2016,56(1):24-36.
[9]刘芮,陈小平,王向东,等.Ni对耐候钢在模拟海洋大气环境下耐蚀性的影响[J].腐蚀科学与防护技术,2016,28(2):122-128.
[10]王俊山,史培阳,刘承军,等.镍含量对高强耐候钢组织与性能的影响[J].材料与冶金学报,2015,14(2):135-138.
[11]顾家琳,闫睿,久本淳,等.镍含量对钢材大气腐蚀的影响[J].腐蚀与防护,2010,31(1):5-9.
[12]SHIRAGA T.Hydrogen embrittlement of steel[J].Zairyo-toKankyo,2011,60(5):236-240.
[13]褚武扬,乔利杰,李金许,等.氢脆和应力腐蚀[M].北京:科学出版社,2013.
[14]李阳,张永健,惠卫军,等.高强度钢42Cr Mo VNb的氢致延迟断裂行为[J].钢铁研究学报,2011,23(12):35-39,59.
[15]YOSHIO Y,MINOZAKI Y.Sulfide stress cracking resistance of low-alloy nickel steels[J].Corrosion,1986,42(4):222-233.
[16]SHIMOTSUSA M,IBARAKI N,IKEDA T,et al.Wire rod for suspension spring with excellent corrosion fatigue life[J].Wire Journal International,1998(3):78-83.
[17]孙曼丽,惠卫军,张代明,等.Ni对中碳高强度弹簧钢腐蚀疲劳性能的影响[J].特殊钢,2008,29(4):52-54.