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Title: Microstructural characterization in dissimilar friction stir welding between 304 stainless steel and st37 steel

Abstract

In the present study, 3 mm-thick plates of 304 stainless steel and st37 steel were welded together by friction stir welding at a welding speed of 50 mm/min and tool rotational speed of 400 and 800 rpm. X-ray diffraction test was carried out to study the phases which might be formed in the welds. Metallographic examinations, and tensile and microhardness tests were used to analyze the microstructure and mechanical properties of the joint. Four different zones were found in the weld area except the base metals. In the stir zone of the 304 stainless steel, a refined grain structure with some features of dynamic recrystallization was evidenced. A thermomechanically-affected zone was characterized on the 304 steel side with features of dynamic recovery. In the other side of the stir zone, the hot deformation of the st37 steel in the austenite region produced small austenite grains and these grains transformed to fine ferrite and pearlite and some products of displacive transformations such as Widmanstatten ferrite and martensite by cooling the material after friction stir welding. The heat-affected zone in the st37 steel side showed partially and fully refined microstructures like fusion welding processes. The recrystallization in the 304 steel and themore » transformations in the st37 steel enhanced the hardness of the weld area and therefore, improved the tensile properties of the joint. - Highlights: Black-Right-Pointing-Pointer FSW produced sound welds between st37 low carbon steel and 304 stainless steel. Black-Right-Pointing-Pointer The SZ of the st37 steel contained some products of allotropic transformation. Black-Right-Pointing-Pointer The material in the SZ of the 304 steel showed features of dynamic recrystallization. Black-Right-Pointing-Pointer The finer microstructure in the SZ increased the hardness and tensile strength.« less

Authors:
 [1];  [2];  [3];  [1];  [4];  [3];  [1]
  1. Department of Materials Eng., Tarbiat Modares University, P.O. Box: 14115-143, Tehran (Iran, Islamic Republic of)
  2. (China)
  3. State Key Laboratory of Advanced Welding Production Technology, School of Materials Science and Eng., Harbin Institute of Technology, P.O. Box: 150001, Harbin (China)
  4. Advanced Materials Research Center, Sahand University of Technology, P.O. Box: 51335-1996, Tabriz (Iran, Islamic Republic of)
Publication Date:
OSTI Identifier:
22163159
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 74; Journal Issue: Complete; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AUSTENITE; CARBON STEELS; DEFORMATION; FERRITE; FERRITES; FRICTION; HEAT AFFECTED ZONE; MARTENSITE; METALLOGRAPHY; MICROHARDNESS; MICROSTRUCTURE; PEARLITE; RECRYSTALLIZATION; STAINLESS STEEL-304; TENSILE PROPERTIES; WELDED JOINTS; WELDING; X-RAY DIFFRACTION

Citation Formats

Jafarzadegan, M., State Key Laboratory of Advanced Welding Production Technology, School of Materials Science and Eng., Harbin Institute of Technology, P.O. Box: 150001, Harbin, Feng, A.H., Abdollah-zadeh, A., E-mail: zadeh@modares.ac.ir, Saeid, T., Shen, J., and Assadi, H. Microstructural characterization in dissimilar friction stir welding between 304 stainless steel and st37 steel. United States: N. p., 2012. Web. doi:10.1016/J.MATCHAR.2012.09.004.
Jafarzadegan, M., State Key Laboratory of Advanced Welding Production Technology, School of Materials Science and Eng., Harbin Institute of Technology, P.O. Box: 150001, Harbin, Feng, A.H., Abdollah-zadeh, A., E-mail: zadeh@modares.ac.ir, Saeid, T., Shen, J., & Assadi, H. Microstructural characterization in dissimilar friction stir welding between 304 stainless steel and st37 steel. United States. doi:10.1016/J.MATCHAR.2012.09.004.
Jafarzadegan, M., State Key Laboratory of Advanced Welding Production Technology, School of Materials Science and Eng., Harbin Institute of Technology, P.O. Box: 150001, Harbin, Feng, A.H., Abdollah-zadeh, A., E-mail: zadeh@modares.ac.ir, Saeid, T., Shen, J., and Assadi, H. Sat . "Microstructural characterization in dissimilar friction stir welding between 304 stainless steel and st37 steel". United States. doi:10.1016/J.MATCHAR.2012.09.004.
@article{osti_22163159,
title = {Microstructural characterization in dissimilar friction stir welding between 304 stainless steel and st37 steel},
author = {Jafarzadegan, M. and State Key Laboratory of Advanced Welding Production Technology, School of Materials Science and Eng., Harbin Institute of Technology, P.O. Box: 150001, Harbin and Feng, A.H. and Abdollah-zadeh, A., E-mail: zadeh@modares.ac.ir and Saeid, T. and Shen, J. and Assadi, H.},
abstractNote = {In the present study, 3 mm-thick plates of 304 stainless steel and st37 steel were welded together by friction stir welding at a welding speed of 50 mm/min and tool rotational speed of 400 and 800 rpm. X-ray diffraction test was carried out to study the phases which might be formed in the welds. Metallographic examinations, and tensile and microhardness tests were used to analyze the microstructure and mechanical properties of the joint. Four different zones were found in the weld area except the base metals. In the stir zone of the 304 stainless steel, a refined grain structure with some features of dynamic recrystallization was evidenced. A thermomechanically-affected zone was characterized on the 304 steel side with features of dynamic recovery. In the other side of the stir zone, the hot deformation of the st37 steel in the austenite region produced small austenite grains and these grains transformed to fine ferrite and pearlite and some products of displacive transformations such as Widmanstatten ferrite and martensite by cooling the material after friction stir welding. The heat-affected zone in the st37 steel side showed partially and fully refined microstructures like fusion welding processes. The recrystallization in the 304 steel and the transformations in the st37 steel enhanced the hardness of the weld area and therefore, improved the tensile properties of the joint. - Highlights: Black-Right-Pointing-Pointer FSW produced sound welds between st37 low carbon steel and 304 stainless steel. Black-Right-Pointing-Pointer The SZ of the st37 steel contained some products of allotropic transformation. Black-Right-Pointing-Pointer The material in the SZ of the 304 steel showed features of dynamic recrystallization. Black-Right-Pointing-Pointer The finer microstructure in the SZ increased the hardness and tensile strength.},
doi = {10.1016/J.MATCHAR.2012.09.004},
journal = {Materials Characterization},
number = Complete,
volume = 74,
place = {United States},
year = {Sat Dec 15 00:00:00 EST 2012},
month = {Sat Dec 15 00:00:00 EST 2012}
}