Small Crack Effect on Threshold Stress Intensity KTH for High Strength Steel with Internal Hydrogen

摘要：

　　The size effect of the threshold stress intensity KTH for hydrogen-precharged specimens of SAE52100 were investigated.Four types of tensile specimens were used: (i) smooth specimens and (ii) specimens having various shapes of artificial defects with sizes of about 35 ~ 500 μm.In the smooth specimens,fracture origins were nonmetallic inclusions with the size of 10 ~ 30 μm (e.g.Al2O3·(CaO)x,TiN and TiC).The fracture toughness determined for the small defects at fracture origin,i.e.the KTH calculated from the defect size (area) and the fracture tensile stress σf,showed a defect size dependence,where,area denotes the area of the domain defined by projecting the defect on a plane normal to the cylindrical axis of the specimen.The values of KTH for both the nonmetallic inclusions and artificial defects were much smaller than those for large cracks measured by the standard WOL and CT specimens.

关键词： Threshold stress intensity Defect size Nonmetallic inclusion Hydrogen embrittlement High strength steel

作者: Yukitaka Murakami Hisao Matsunaga Arezou Abyazi Yoshihiro Fukushima

作者单位: International Institute for Carbon-Neutral Energy Research(I2CNER),Kyushu University,Fukuoka 819-039 International Institute for Carbon-Neutral Energy Research(I2CNER),Kyushu University,Fukuoka 819-039 Department of Materials Engineering,Sahand University of Technology,Tabriz,Iran International Institute for Carbon-Neutral Energy Research(I2CNER),Kyushu University,Fukuoka 819-039

会议类型: 国际会议

会议名称: 第13届国际断裂大会(ICF2013)

会议地点: 北京

会议语种:英文

页码: 1-10

在线出版日期: 2013-06-16（万方平台首次上网日期，不代表论文的发表时间）