Microstructure, mechanical properties, and damping capacity in stir zone after friction stir welding of Fe-17Mn damping alloy

被引:27
作者
Lee, Seung-Joon [1 ]
Shin, Se Eun [2 ]
Ushioda, Kohsaku [1 ]
Fujii, Hidetoshi [1 ]
机构
[1] Osaka Univ, JWRI, 11-1 Mihogaoka, Ibaraki, Osaka 5670047, Japan
[2] Sunchon Natl Univ, Dept Adv Mat Engn, Sunchon 57922, South Korea
关键词
Metals and alloys; Mechanical properties; Phase transitions; Microstructure; STACKING-FAULT ENERGY; AUSTENITE GRAIN-SIZE; EPSILON-MARTENSITIC-TRANSFORMATION; INDUCED PLASTICITY STEELS; M-S TEMPERATURE; TENSILE PROPERTIES; DEFORMATION-BEHAVIOR; CARBON CONTENT; MN STEEL; X-RAY;
D O I
10.1016/j.jallcom.2019.06.367
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The microstructure, stacking fault energy (SFE), tensile properties, fractured surface, and the damping capacity of the Fe-17Mn (wt.%) alloy with a dual phase structure of gamma austenite and epsilon martensite were systematically investigated at different tool rotation speeds (i.e., 120, 280, and 440 rpm) during friction stir welding (FSW). The FSWed specimens have a larger fraction of the epsilon phase than the base material (BM) despite finer grains and higher SFE because of the increased transformation kinetics on subsequent cooling after FSW caused by the introduced dislocations during FSW. With the higher speeds up to 440 rpm, the epsilon fraction increases gradually, owing to the lower gamma stability by grain coarsening and lower SFE. Both the yield and ultimate tensile strengths (YS and UTS) are enhanced in the FSWed specimens relative to the BM regardless of the rotation speed, while total elongation drops at 120 and 280 rpm and rises again at 440 rpm. Both grain coarsening and reduction in the accumulated dislocations at higher speeds result in a decrease in YS. The reason for the improved UTS of FSWed specimens is the increase in the strain hardening rate (SHR) caused by active transformation-induced plasticity from gamma phase. With increasing speeds up to 440 rpm, an excellent balance of the UTS and total elongation is obtained from the sustained SHR by the increased mechanical stability, the facilitation of the pyramidal slip and twinning in the epsilon phase, and reduction of the quasi-cleavage fracture. The damping capacity after FSW decreases owing to the pinning effect of the partial dislocation by the introduced dislocations during FSW. (C) 2019 Elsevier B.V. All rights reserved.
引用
收藏
页码:1155 / 1167
页数:13
相关论文
共 68 条
[1]  
[Anonymous], 1978, Martensitic Transformation
[2]   High damping Fe-Mn martensitic alloys for engineering applications [J].
Baik, SH .
NUCLEAR ENGINEERING AND DESIGN, 2000, 198 (03) :241-252
[3]  
Bingnan Q., 2018, SMART MATER STRUCT, V27
[4]   Microstructural evolution and deformation mechanism of a Fe-15Mn alloy investigated by electron back -scattered diffraction and transmission electron microscopy [J].
Chen, Jun ;
Zhang, Wei-na ;
Liu, Zhen-yu ;
Wang, Guo-dong .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2017, 698 :198-205
[5]   Effect of carbon on the damping capacity and mechanical properties of thermally trained Fe-Mn based high damping alloys [J].
Choi, Won Seok ;
De Cooman, Bruno C. .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2017, 700 :641-648
[6]   Thermodynamic modeling of the stacking fault energy of austenitic steels [J].
Curtze, S. ;
Kuokkala, V. -T. ;
Oikari, A. ;
Talonen, J. ;
Hanninen, H. .
ACTA MATERIALIA, 2011, 59 (03) :1068-1076
[7]   Deformation behavior of TRIP and DP steels in tension at different temperatures over a wide range of strain rates [J].
Curtze, S. ;
Kuokkala, V. -T. ;
Hokka, M. ;
Peura, P. .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2009, 507 (1-2) :124-131
[8]   Influence of addition elements on the stacking-fault energy and mechanical properties of an austenitic Fe-Mn-C steel [J].
Dumay, A. ;
Chateau, J. -P. ;
Allain, S. ;
Migot, S. ;
Bouaziz, O. .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2008, 483-84 :184-187
[9]   High strength and ductility of friction-stir-welded steel joints due to mechanically stabilized metastable austenite [J].
Fujii, Hidetoshi ;
Ueji, Rintaro ;
Morisada, Yoshiaki ;
Tanigawa, Hiroyasu .
SCRIPTA MATERIALIA, 2014, 70 :39-42
[10]   AN X-RAY-DIFFRACTION LINE-PROFILE OF COLD-WORKED HEXAGONAL ALLOYS ZN-AG - ETA-PHASE AND EPSILON-PHASE [J].
GHOSH, SK ;
SENGUPTA, SP .
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1985, 16 (08) :1427-1435