Improved Fatigue Behavior of Pipeline Steel Welded Joint by Surface Mechanical Attrition Treatment (SMAT)

材料科学技术（英文）, 2009, 25(4): 513-515.

^1, , ^2, , ^3, , ^4, , ^5,

1.School of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China

2.School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China

3.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

4.School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China

5.School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China

基金项目: the CNPC (China Na-tional Petroleum Corporation) Innovation Foundation(07E1015)

Improved Fatigue Behavior of Pipeline Steel Welded Joint by Surface Mechanical Attrition Treatment (SMAT)

Yu Wang ^1, , Min Huang ^2, , Lei Zhou ^3, , Zhixin Cong ^4, , Huilin Gao ^5,

1.School of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China

2.School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China

3.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

4.School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China

5.School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China

Keywords： Surface mechanical attrition treatment (SMAT)

A pipeline steel X80 with welded joint was subjected to surface mechanical attrition treatment (SMAT). After SMAT, a nanostructure surface layer with an average grain size of about 10 nm was formed in the treated sample, and the fatigue limit of the welded joint was elevated by about 13% relative to the untreated joints. In the low and the high amplitude stress regimes, both fatigue strength and fatigue life were enhanced. Formation of the nanostructured surface layer played more important role in the enhanced fatigue behavior than that of residual stress induced by the SMAT.

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