A Review of Austenite Memory Effect in HAZ of B Containing 9% Cr Martensitic Heat Resistant Steel

During the welding process of B containing 9% Cr martensitic heat resistant steel (9Cr-B steel), austenite memory effect (referred to that the prior austenite grains in the heat affected zone (HAZ) after welding inherit the shape and size of prior austenite grains before welding) occurs in its norma...

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Main Authors:	Xiaogang Li, Kejian Li, Zhipeng Cai, Jiluan Pan
Format:	Article
Language:	English
Published:	MDPI AG 2019-11-01
Series:	Metals
Subjects:	9cr-b steel heat affected zone (haz) microstructure austenite memory effect martensitic reverse transformation diffusion retained austenite
Online Access:	https://www.mdpi.com/2075-4701/9/11/1233

id	doaj-946dd5547fa2454eb54d4fdd9d91f709
record_format	Article
spelling	doaj-946dd5547fa2454eb54d4fdd9d91f7092020-11-25T01:25:43ZengMDPI AGMetals2075-47012019-11-01911123310.3390/met9111233met9111233A Review of Austenite Memory Effect in HAZ of B Containing 9% Cr Martensitic Heat Resistant SteelXiaogang Li0Kejian Li1Zhipeng Cai2Jiluan Pan3Department of Mechanical Engineering, Tsinghua University, Beijing 100084, ChinaDepartment of Mechanical Engineering, Tsinghua University, Beijing 100084, ChinaDepartment of Mechanical Engineering, Tsinghua University, Beijing 100084, ChinaDepartment of Mechanical Engineering, Tsinghua University, Beijing 100084, ChinaDuring the welding process of B containing 9% Cr martensitic heat resistant steel (9Cr-B steel), austenite memory effect (referred to that the prior austenite grains in the heat affected zone (HAZ) after welding inherit the shape and size of prior austenite grains before welding) occurs in its normalized sub-zone of HAZ and the grain refinement is suppressed, which can effectively prevent type IV crack, and improve the service life of the welded joint at high temperatures. In the present article, α/γ reverse transformation behavior in the normalized sub-zone of 9Cr-B steel HAZ is reviewed. Austenite memory effect of 9Cr-B steel is derived from B addition. The main mechanisms of austenite memory effect during α/γ reverse transformation are discussed. Various models of boron causing austenite memory effect are discussed in detail. Matrix microstructure also plays an important role in austenite memory effect. Effects of heating rate, peak temperature, and holding time at peak temperature on austenite memory effect are also discussed.https://www.mdpi.com/2075-4701/9/11/12339cr-b steelheat affected zone (haz) microstructureaustenite memory effectmartensitic reverse transformationdiffusionretained austenite
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Xiaogang Li Kejian Li Zhipeng Cai Jiluan Pan
spellingShingle	Xiaogang Li Kejian Li Zhipeng Cai Jiluan Pan A Review of Austenite Memory Effect in HAZ of B Containing 9% Cr Martensitic Heat Resistant Steel Metals 9cr-b steel heat affected zone (haz) microstructure austenite memory effect martensitic reverse transformation diffusion retained austenite
author_facet	Xiaogang Li Kejian Li Zhipeng Cai Jiluan Pan
author_sort	Xiaogang Li
title	A Review of Austenite Memory Effect in HAZ of B Containing 9% Cr Martensitic Heat Resistant Steel
title_short	A Review of Austenite Memory Effect in HAZ of B Containing 9% Cr Martensitic Heat Resistant Steel
title_full	A Review of Austenite Memory Effect in HAZ of B Containing 9% Cr Martensitic Heat Resistant Steel
title_fullStr	A Review of Austenite Memory Effect in HAZ of B Containing 9% Cr Martensitic Heat Resistant Steel
title_full_unstemmed	A Review of Austenite Memory Effect in HAZ of B Containing 9% Cr Martensitic Heat Resistant Steel
title_sort	review of austenite memory effect in haz of b containing 9% cr martensitic heat resistant steel
publisher	MDPI AG
series	Metals
issn	2075-4701
publishDate	2019-11-01
description	During the welding process of B containing 9% Cr martensitic heat resistant steel (9Cr-B steel), austenite memory effect (referred to that the prior austenite grains in the heat affected zone (HAZ) after welding inherit the shape and size of prior austenite grains before welding) occurs in its normalized sub-zone of HAZ and the grain refinement is suppressed, which can effectively prevent type IV crack, and improve the service life of the welded joint at high temperatures. In the present article, α/γ reverse transformation behavior in the normalized sub-zone of 9Cr-B steel HAZ is reviewed. Austenite memory effect of 9Cr-B steel is derived from B addition. The main mechanisms of austenite memory effect during α/γ reverse transformation are discussed. Various models of boron causing austenite memory effect are discussed in detail. Matrix microstructure also plays an important role in austenite memory effect. Effects of heating rate, peak temperature, and holding time at peak temperature on austenite memory effect are also discussed.
topic	9cr-b steel heat affected zone (haz) microstructure austenite memory effect martensitic reverse transformation diffusion retained austenite
url	https://www.mdpi.com/2075-4701/9/11/1233
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A Review of Austenite Memory Effect in HAZ of B Containing 9% Cr Martensitic Heat Resistant Steel

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