Grain boundary engineering to overcome temper embrittlement in martensitic steel

被引：13
作者：
Godbole, Kirtiratan [1 ]
Das, C. R. [2 ,3 ]
Albert, S. K. [2 ,3 ]
Panigrahi, Bharat B. [1 ]
机构：
[1] Indian Inst Technol Hyderabad, Dept Mat Sci & Met Engn, Sangareddy 502285, Telangana, India
[2] Indira Gandhi Ctr Atom Res, Kalpakkam 603102, Tamil Nadu, India
[3] Homi Bhabha Natl Inst, Kalpakkam 603102, Tamil Nadu, India
来源：
MATERIALS LETTERS | 2020年 / 264卷
关键词：
Grain boundaries; Interfaces; Segregation; Toughness; Martensite; Phase transformation; AUSTENITE; SEGREGATION; SUPERALLOY; RESISTANCE; FERRITE; FATIGUE;
D O I：
10.1016/j.matlet.2020.127321
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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. (C) 2020 Elsevier B.V. All rights reserved.
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页数：4
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