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Grain boundary engineering to overcome temper embrittlement in martensitic steel
Materials Letters ( IF 3 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.matlet.2020.127321
Kirtiratan Godbole , C.R. Das , S.K. Albert , Bharat B. Panigrahi

Abstract 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.

中文翻译:

克服马氏体钢回火脆化的晶界工程

摘要 在马氏体钢中引入了晶界工程 (GBE) 方法,通过淬火和分配 (Q&P) 热处理来克服回火脆化。这种热处理通过残余奥氏体向马氏体的转变,将低能量重合点晶格 (CSL) 边界的分数从 Q&P 试样中的 0.12 增加到 Q&P 回火试样中的 0.22。马氏体基体中奥氏体的存在会产生不同的界面。与具有高能马氏体/马氏体界面的正火和回火试样相比,低能奥氏体/奥氏体和奥氏体/马氏体界面减少了回火过程中杂质元素的偏析,从而提高了韧性。
更新日期:2020-04-01
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