Microstructural Study of 17-4PH Stainless Steel after Plasma-Transferred Arc Welding
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 characte...
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doaj-ec436ae3270c4b0b86394c24792c178b2020-11-24T21:55:37ZengMDPI AGMaterials1996-19442015-01-018242443410.3390/ma8020424ma8020424Microstructural Study of 17-4PH Stainless Steel after Plasma-Transferred Arc WeldingDewei Deng0Rui Chen1Qi Sun2Xiaona Li3School of Material Science and Engineering, Dalian University of Technology, Dalian 116024, ChinaSchool of Material Science and Engineering, Dalian University of Technology, Dalian 116024, ChinaSchool of Material Science and Engineering, Dalian University of Technology, Dalian 116024, ChinaSchool of Material Science and Engineering, Dalian University of Technology, Dalian 116024, ChinaThe 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.http://www.mdpi.com/1996-1944/8/2/424heat affected zone17-4PHCo-based alloymicrostructurebase metal |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Dewei Deng Rui Chen Qi Sun Xiaona Li |
spellingShingle |
Dewei Deng Rui Chen Qi Sun Xiaona Li Microstructural Study of 17-4PH Stainless Steel after Plasma-Transferred Arc Welding Materials heat affected zone 17-4PH Co-based alloy microstructure base metal |
author_facet |
Dewei Deng Rui Chen Qi Sun Xiaona Li |
author_sort |
Dewei Deng |
title |
Microstructural Study of 17-4PH Stainless Steel after Plasma-Transferred Arc Welding |
title_short |
Microstructural Study of 17-4PH Stainless Steel after Plasma-Transferred Arc Welding |
title_full |
Microstructural Study of 17-4PH Stainless Steel after Plasma-Transferred Arc Welding |
title_fullStr |
Microstructural Study of 17-4PH Stainless Steel after Plasma-Transferred Arc Welding |
title_full_unstemmed |
Microstructural Study of 17-4PH Stainless Steel after Plasma-Transferred Arc Welding |
title_sort |
microstructural study of 17-4ph stainless steel after plasma-transferred arc welding |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2015-01-01 |
description |
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. |
topic |
heat affected zone 17-4PH Co-based alloy microstructure base metal |
url |
http://www.mdpi.com/1996-1944/8/2/424 |
work_keys_str_mv |
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