Microstructure evolution of fibre laser welded TRIP and HSLA steel sheets with different thicknesses

被引：7
|
作者：
Svec, P. [1 ]
Schrek, A. [1 ]
Domankova, M. [2 ]
机构：
[1] Slovak Univ Technol Bratislava, Fac Mech Engn, Inst Technol & Mat, Pionierska 15, Bratislava 83102, Slovakia
[2] Slovak Univ Technol Bratislava, Fac Mat Sci & Technol Trnava, Inst Mat Sci, Bottova 25, Trnava 91724, Slovakia
来源：
KOVOVE MATERIALY-METALLIC MATERIALS | 2019年 / 57卷 / 04期
关键词：
TRIP steel; HSLA steel; fibre laser welding; microstructure; MECHANICAL-PROPERTIES; DUAL-PHASE; STRENGTH; STRESS; BLANKS; BEHAVIOR; JOINTS;
D O I：
10.4149/km_2019_4_219
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructure of fibre laser welded joint of TRIP 690T and HSLA LAD340 steel sheets with different thicknesses was evaluated. The microstructure in the fusion zone was built of martensite, lower bainite and a small portion of upper bainite. Martensite and lower bainite created in both the coarse-grained and fine-grained heat affected zones (HAZs) near 690T steel, but some portion of ferrite was also identified in the fine-grained HAZ near 690T steel. Acicular ferrite, upper bainite, and equiaxed ferrite were observed in both the coarsegrained and fine-grained HAZs near LAD340 steel, but lower bainite was occasionally found in the coarse-grained HAZ near LAD340 steel. Creation of hard microconstituents caused an increase in microhardness values in the fusion zone and both HAZs compared to the base metals. The highest microhardness of 457 HV0.1 was measured in the coarse-grained HAZ near 690T steel with martensitic and lower bainitic microstructure.
引用
收藏
页码：219 / 227
页数：9
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