Study on bainite/martensite transformation in reheated weld metals

doi:10.4028/www.scientific.net/MSF.941.645

	Study on bainite/martensite transformation in reheated weld metals
	Mao, Gaojun 1,2; Cayron, Cyril 1; Cao, Rui 2; Logé, Roland 1; Chen, Jianhong 2
	2018
会议日期	July 9, 2018 - July 13, 2018
会议地点	Paris, France
关键词	Backscattering Bainite Martensite Scanning electron microscopy Welds Crystallographic characteristics EBSD Electron backscattering diffraction Field emission scanning electron microscopes Habit plane K-S orientation relationships LSCM Orientation relationship
卷号	941 MSF
DOI	10.4028/www.scientific.net/MSF.941.645
页码	645-650
英文摘要	A new combination of laser scanning confocal microscope (LSCM) and electron backscattering diffraction (EBSD) with a field-emission scanning electron microscope (SEM) is utilized to study the mechanism of bainite transformation in reheated low carbon bainitic weld metal. The LSCM observations show that laths grow on the surface at various rates, from 30 μm/s to 240 μm/s, which is greatly larger than those referred in literature for bainite. In order to confirm that the laths are bainite and not surface martensite, additional experiments were performed. The crystallographic characteristics of surface bainite were compared with those of bulk bainite obtained during isothermal treatments and those of bulk martensite obtained by water quenching. By means of a dedicated EBSD data-treatment software, orientation relationship, variant selection and packet groups were identified; it was shown that both the surface laths and bulk bainite share the same misorientation, habit plane, and have similar variant distribution. Experiments are running to compare these features with those of bulk martensite. If the distinction between martensite and bainite is successful, the very high growth rates of the surface laths could be used to discuss the displacive/diffusive nature of bainitic transformations. © 2018 Trans Tech Publications, Switzerland.
会议录	Materials Science Forum
会议录出版者	Trans Tech Publications Ltd
语种	英语
ISSN号	02555476
内容类型	会议论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/118097]
专题	材料科学与工程学院
作者单位	1.Laboratory of Thermo Mechanical Metallurgy (LMTM), PX Group Chair, Ecole Polytechnique Fédérale de Lausanne (EPFL), Rue de la Maladière 71b, Neuchâtel; 2000, Switzerland 2.State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology (LUT), Lanzhou; 730050, China;
推荐引用方式 GB/T 7714	Mao, Gaojun,Cayron, Cyril,Cao, Rui,et al. Study on bainite/martensite transformation in reheated weld metals[C]. 见:. Paris, France. July 9, 2018 - July 13, 2018.