Microstructural evolution and mechanical behaviour of boronized martensitic stainless steels

13Cr-4Ni and 16Cr-5Ni martensitic stainless steels are boronized at 900°C, 950°C and 1000°C for 2, 4, 6, 8 h using powder pack boronizing followed by tempering at 600°C for 2 h. Boronized layer morphology, composition and case depth are studied using optical microscopy, XRD, XPS and SEM. The influen...

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Bibliographic Details
Published inSurface engineering Vol. 38; no. 5; pp. 552 - 561
Main Authors Mohan, Nirupama, Chaudhari, Gajanan
Format Journal Article
LanguageEnglish
Published London, England Taylor & Francis 04.05.2022
SAGE Publications
Subjects
activation energy
Boronizing
fracture toughness
growth kinetics
hardness
hydraulic turbines
SEM
stainless steels
hardness
fracture toughness
stainless steels
Boronizing
activation energy
growth kinetics
SEM
hydraulic turbines
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Summary:13Cr-4Ni and 16Cr-5Ni martensitic stainless steels are boronized at 900°C, 950°C and 1000°C for 2, 4, 6, 8 h using powder pack boronizing followed by tempering at 600°C for 2 h. Boronized layer morphology, composition and case depth are studied using optical microscopy, XRD, XPS and SEM. The influence of temperature and duration of boronizing on the growth kinetics of boronized layer is studied. Higher alloy content of 16Cr-5Ni MSS resulted in higher activation energy of boronizing, limiting the attainable case depth. Higher boronizing temperatures produced additional borides besides iron borides that increased hardness and decreased ductility, strain energy density and fracture toughness. Identified boronizing parameters could be useful in enhancing the performance of these grades in hydraulic machinery.
ISSN:0267-0844
1743-2944
DOI:10.1080/02670844.2022.2113612