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Effects of Normalizing Processes on Microstructure and Impact Toughness in Ti-bearing Weld Metal of Multi layer MAG Welded HSLA Steel
S. P. Lu; X. Wang; W. C. Dong; Y. Y. Li
2013
Source PublicationIsij International
ISSN0915-1559
Volume53Issue:1Pages:96-101
AbstractThe influences of different normalizing heat treatments on microstructure, non-metallic inclusions and impact toughness in MAG Ti-bearing weld metal of HSLA steel has been studied. It has been shown that for the Ti-bearing weld metal the impact toughness after normalizing treatment decreases significantly against prolonging holding time and increasing normalizing temperature. The Mn-depleted zone forms around the Ti-bearing phase (MnTiO3) precipitated on Mn-Si oxide. Proeutectoid ferrite preferentially nucleates at the Mn-depleted zone and the interface between austenite and proeutectoid ferrite becomes the nucleation sites for pearlite thereafter. Mn-depleted zone formation increases the pearlite nucleation sites, and makes the pearlite fine. The dissolve of Ti-bearing precipitate causes disappear of Mn-depleted zone at strong normalizing processes (longer normalizing time and higher normalizing temperature), and the number of ferrite nucleation sites decreases, then the pearlite become coarser, which causes the deterioration of impact toughness.
description.department[lu, shanping ; wang, xin ; dong, wenchao ; li, yiyi] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; lu, sp (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; shplu@imr.ac.cn
KeywordNormalizing Process Weld Metal Impact Toughness Ti-bearing Precipitate Heat-affected Zone Inclusion Formation Titanium Addition Deoxidized Steel Ferrite Precipitation Oxide Solidification Carbonitrides Nucleation
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Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/71391
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
S. P. Lu,X. Wang,W. C. Dong,et al. Effects of Normalizing Processes on Microstructure and Impact Toughness in Ti-bearing Weld Metal of Multi layer MAG Welded HSLA Steel[J]. Isij International,2013,53(1):96-101.
APA S. P. Lu,X. Wang,W. C. Dong,&Y. Y. Li.(2013).Effects of Normalizing Processes on Microstructure and Impact Toughness in Ti-bearing Weld Metal of Multi layer MAG Welded HSLA Steel.Isij International,53(1),96-101.
MLA S. P. Lu,et al."Effects of Normalizing Processes on Microstructure and Impact Toughness in Ti-bearing Weld Metal of Multi layer MAG Welded HSLA Steel".Isij International 53.1(2013):96-101.
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