Austenite grain growth and microstructure control in simulated heat affected zones of microalloyed HSLA steel

被引：52
作者：
Zhang, Lei [1 ,2 ]
Kannengiesser, Thomas [2 ,3 ]
机构：
[1] Tech Univ Berlin, Dept Machine Tools & Factory Management, D-10587 Berlin, Germany
[2] Fed Inst Mat Res & Testing, D-12205 Berlin, Germany
[3] Univ Magdeburg, Inst Mat & Joining Technol, D-39106 Magdeburg, Germany
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 613卷
关键词：
Hardness measurement; Microstructure; Microalloyed steel; Welding; Grain growth; INTRAGRANULAR ACICULAR FERRITE; LOW-ALLOY STEEL; HIGH-STRENGTH; MECHANICAL-PROPERTIES; BRITTLE-FRACTURE; THERMAL CYCLES; TI; NUCLEATION; VANADIUM; SIZE;
D O I：
10.1016/j.msea.2014.06.106
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The roles of microalloying niobium, titanium and vanadium for controlling austenite grain growth, microstructure evolution and hardness were investigated at different simulated heat affected zones (HAZ) for high strength low alloy (HSLA) S690QL steel. High resolution FEG-SEM has been used to characterize fine bainitic ferrite, martensite and nanosized second phases at simulated coarse and fine grain HAZs. It was found that for Ti bearing steel (Ti/N ratio is 2) austenite grain had the slowest growth rate due to the presence of most stable TiN. The fine cuboidal particles promoted intragranular acicular ferrite (IGF) formation. Nb bearing steel exhibited relatively weaker grain growth retardation compared with titanium bearing steels and a mixed microstructure of bainite and martensite was present for all simulated HAZs. IGF existed at coarse grain HAZ of Ti+V bearing steel but it was totally replaced by bainite at fine grain HAZs. Hardness result was closely related to the morphology of bainitic ferrite, intragranular ferrite and second phases within ferrite. The microstructure and hardness results of different simulated HAZs were in good agreement with welded experimental results. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：326 / 335
页数：10
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