Influence of Plastic Pre-Strain on Low-Temperature Gas Carburization of 316L Austenitic Stainless Steel

摘要：

　　In this paper,the influence of pre-strain on low-temperature gas carburization of 316L austenitic stainless steel was investigated.A group of flat specimens were uniaxial tensile to several levels of pre-strain including 5%,10%,15%,20% and 25% engineering strain.Then,the pre-strained specimens was treated by low-temperature gas carburization at 470 ℃ for 30 h.In order to elucidate the effect of pre-strain on low-temperature gas carburization,optical microscopy (OM),X-ray diffractometer (XRD),scanning electron probe micro-analyzer (EPMA),microhardness tester and residual stress analyzer were used.Meanwhile,dislocation density of the pre-strained specimens was semi-quantitatively measured by means of X-ray diffraction analysis and the role of dislocation density on carbon diffusion during low-temperature gas carburization was discussed.The results show as follow: (1) the thicknesses of the carburized layers are independent of the pre-strain degree.(2) dislocation density increases with the increasing pre-strain,but almost has no effect on carbon diffusion at the given carburizing temperature.(3) an outstanding surface with hardness (≈ 1150 HV0.1) and compressive residual stress (≈1900 MPa) is introduced by low-temperature gas carburization,and the strengthening results of carburization are unaffected by pre-strain.

关键词： Plastic pre-strain Dislocation density X-ray diffraction Low-temperature gas carburization 316L austenitic stainless steel

作者: Yawei Peng Jianming Gong Yong Jiang Minghui Fu Dongsong Rong

作者单位: School of Mechanical and Power Engineering,Nanjing Tech University,No.30 Puzhu South Road,Nanjing 211816,China

会议类型: 国际会议

会议名称: 2016 International Symposium on Structural Integrity，ISSI—2016(2016国际结构完整性研讨会)

会议地点: 天津

会议语种:英文

页码: 178-183

在线出版日期: 2016-05-26（万方平台首次上网日期，不代表论文的发表时间）