Grain boundary engineering to overcome temper embrittlement in martensitic steel

Godbole, Kirtiratan and Das, C R and Panigrahi, Bharat Bhooshan and et al, . (2020) Grain boundary engineering to overcome temper embrittlement in martensitic steel. Materials Letters. ISSN 0167-577X (In Press)

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Grain boundary engineering (GBE) approach has been introduced in martensitic steel through quenching and partitioning (Q&P) heat treatment to overcome temper embrittlement. This heat treatment increases fraction of low energy coincidence site lattice (CSL) boundary from 0.12 in Q&P specimen to 0.22 in Q&P-tempered specimen through transformation of retained austenite to martensite. Presence of austenite in martensitic matrix produces different interfaces. Low energy austenite/austenite and austenite/martensite interfaces reduces segregation of tramp elements during tempering leading to increased toughness compared to normalized and tempered specimen having high energy martensite/martensite interface. Increased toughness is accompanied by a change in fracture morphology from intergranular fracture to typical dimple fracture.

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IITH Creators:
IITH CreatorsORCiD
Panigrahi, Bharat BhooshanUNSPECIFIED
Item Type: Article
Subjects: Materials Engineering > Materials engineering
Divisions: Department of Material Science Engineering
Depositing User: Team Library
Date Deposited: 16 Jan 2020 06:01
Last Modified: 16 Jan 2020 06:01
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