Tool rotational speed variant response on the evolution of microstructure and its significance on mechanical properties of friction stir welded 9Cr-1Mo steel

被引：17

作者：

Sunilkumar, D. ^{[1
]}

Muthukumaran, S. ^{[1
]}

Vasudevan, M. ^{[2
]}

Reddy, G. Madhusudan ^{[3
]}

机构：

[1] Natl Inst Technol Tiruchirappalli, Dept Met & Mat Engn, Tiruchirappalli 620015, India

[2] Indira Gandhi Ctr Atom Res, Mat Dev & Technol Div, Kalpakkam 603102, Tamil Nadu, India

[3] Def Met Res Lab, Mat Joining Grp, Hyderabad 500058, India

来源：

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY | 2020年 / 278卷

关键词：

Friction stir welding; A-TIG; 9Cr-1Mo steel; Tool rotation speed; Microstructure; Mechanical properties; HEAT-TREATMENT; P91; STEEL; CRACKING;

D O I：

10.1016/j.jmatprotec.2019.116536

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this study, the effect of the tool rotational speed on the microstructure evolution and its significance on the mechanical properties of friction stir welded 9Cr-1Mo (P9) steel is investigated, and its properties are compared with A-TIG welding process. Friction stir welding (FSW) was carried out at two different rotational speeds viz., 200 rpm and 500 rpm with the constant traverse speed of 30 mm/min using the W-La2O3 tool. The consequence of this study showed that irrespective of tool rotational speed, the better tensile properties are achieved by the FSW process, and it is comparable to the A-TIG welded joint. This study proved that FSW is a potential welding technique for welding of P9 steel, and also, there is scope to avoid PWHT by lowering the tool rotational speed ( < 200 rpm). Lower tool rotational speed would reduce the peak temperature well below the Ac-1 temperature and thereby preventing the martensitic formation.

引用

页数：13

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