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Open AccessArticle

Microstructural Study of 17-4PH Stainless Steel after Plasma-Transferred Arc Welding

by Dewei Deng 1,2,*, Rui Chen 1,2, Qi Sun 1,2 and Xiaona Li 1
1
School of Material Science and Engineering, Dalian University of Technology, Dalian 116024, China
2
Shenyang Blower Works Group Corporation, Shenyang 110869, China
*
Author to whom correspondence should be addressed.
Academic Editor: Daolun Chen
Materials 2015, 8(2), 424-434; https://doi.org/10.3390/ma8020424
Received: 28 October 2014 / Accepted: 19 January 2015 / Published: 29 January 2015
(This article belongs to the Special Issue Steels)
The improvement of the surface qualities and surface hardening of precipitation hardened martensitic stainless steel 17-4PH was achieved by the plasma-transferred arc welding (PTAW) process deposited with Co-based alloy. The microstructure of the heat affected zone (HAZ) and base metal were characterized by optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that there are obvious microstructural differences between the base metal and HAZ. For example, base material is transformed from lath martensite to austenite due to the heateffect of the welding process. On the other hand, the precipitate in the matrix (bar-like shape Cr7C3 phase with a width of about one hundred nanometres and a length of hundreds of nanometres) grows to a rectangular appearance with a width of about two hundred nanometres and a length of about one micron. Stacking fault could also be observed in the Cr7C3 after PTAW. The above means that welding can obviously improve the surface qualities. View Full-Text
Keywords: heat affected zone; 17-4PH; Co-based alloy; microstructure; base metal heat affected zone; 17-4PH; Co-based alloy; microstructure; base metal
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MDPI and ACS Style

Deng, D.; Chen, R.; Sun, Q.; Li, X. Microstructural Study of 17-4PH Stainless Steel after Plasma-Transferred Arc Welding. Materials 2015, 8, 424-434.

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