Next Article in Journal
Sol-Gel Synthesis of Silicon-Doped Lithium Manganese Oxide with Enhanced Reversible Capacity and Cycling Stability
Previous Article in Journal
Fabrication of Cu Based Metallic Binder for Diamond Tools by Microwave Pressureless Sintering
Article Menu
Issue 8 (August) cover image

Export Article

Open AccessArticle
Materials 2018, 11(8), 1454; https://doi.org/10.3390/ma11081454

Mechanical Properties Study of Fe-Mn-Si Shape Memory Alloys Welding Seam Formed by Laser Welding with Filler Powder

1
Department of Mechanics, College of Naval Architecture & Ocean Engineering, Dalian Maritime University, No.1 Linghai Road, Dalian 116026, China
2
Department of Technology, Beijing Satellite Manufacturer Limited Company, No. 18 Nansan Streer, Beijing 100094, China
3
Department of Marine Engineering, College of Marine Engineering, Dalian Maritime University, No. 1 Linghai Road, Dalian 116026, China
*
Author to whom correspondence should be addressed.
Received: 11 July 2018 / Revised: 1 August 2018 / Accepted: 13 August 2018 / Published: 16 August 2018
Full-Text   |   PDF [3585 KB, uploaded 16 August 2018]   |  

Abstract

To reduce the residual stress and improve the fatigue property of the laser weldment by using the stress self-accommodation characteristic of Fe-Mn-Si shape memory alloys (SMAs), a Fe15Mn5Si12Cr6Ni memory alloy welding seam was formed inside 304 stainless steel by laser welding with filler powder. The combination of the hole-drilling method and the ANSYS software was used to research the distribution law of residual stress inside the laser welding specimen. The fatigue strength of the laser welded specimens with the Fe-Mn-Si SMAs welding seam (experimental materials) and 304 stainless steel welding seam (comparative materials) was measured by cycle bending fatigue test. The microhardness of the welding specimens was measured by the microhardness tester. The thermodynamic model of the laser welding process and the phase transition crystallography of Fe-Mn-Si SMAs were evaluated to analyze the strengthening mechanism of the mechanical properties in the experimental materials. The results show that the distribution law for residual stress in the experiment and simulation are consistent. The experimental materials possess low residual stress, high fatigue strength and high microhardness. The strengthening mechanism for mechanical properties is the welding residual stress-induced γ→ε martensitic transformation inside the experimental materials, which causes the tensile plastic strain of the welding seam to resist residual compression strain, and the residual stress, as the transition driving force, is released in shear processing. View Full-Text
Keywords: laser welding; filler powder; Fe-Mn-Si SMAs; mechanical properties; strengthening mechanism laser welding; filler powder; Fe-Mn-Si SMAs; mechanical properties; strengthening mechanism
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Ju, H.; Lin, C.; Tian, Y.; Liu, Z.; Jiang, H.; Sun, D. Mechanical Properties Study of Fe-Mn-Si Shape Memory Alloys Welding Seam Formed by Laser Welding with Filler Powder. Materials 2018, 11, 1454.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Materials EISSN 1996-1944 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top