Microstructure and mechanical properties of fiber laser welded joints of ultrahigh-strength steel 22MnB5 and dual-phase steels

被引：46

作者：

Jia, Jin ^{[1
]}

Yang, Shang-Lei ^{[1
,2
]}

Ni, Wei-Yuan ^{[1
]}

Bai, Jian-Ying ^{[1
]}

机构：

[1] Shanghai Univ Engn Sci, Coll Mat Engn, Shanghai 201620, Peoples R China

[2] Shanghai Univ Engn Sci, Shanghai Res & Dev Ctr Key Technol Intelligent Eq, Shanghai 201620, Peoples R China

来源：

JOURNAL OF MATERIALS RESEARCH | 2014年 / 29卷 / 21期

基金：

中国国家自然科学基金;

关键词：

dual-phase steel; laser welding; microstructure; properties; ultrahigh-strength steel;

D O I：

10.1557/jmr.2014.273

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This study was to analyze the microstructure, microhardness, tensile and fatigue performance of the welded joints performed by a fiber laser on 22MnB5 and dual-phase steels (DP590, DP980) in similar and dissimilar combinations. The result shows that the weld zone (WZ) basically consisted of lath martensite. The HAZ in these steels can be divided into 3 parts: quenched, incomplete quenched, and tempered region. The WZ had the highest hardness, and a soft zone existed in the HAZ of all steels. Inside the WZ of the dissimilar welded joints, two hardness subregions were observed due to the difference in the alloying elements of these steels. Tensile specimens of the 22MnB5-22MnB5 and 22MnB5-DP980 welded joints were all broken in HAZ, while the 22MnB5-DP590 welded joints failed in the DP590 base metal (BM). The BM had a higher fatigue life than the welded joints, and the fatigue failure of the 22MnB5 similar and 22MnB5-DP980 dissimilar welded joints respectively occurred in the HAZ and DP980 BM. The fatigue fracture contained 3 parts: crack initiation, crack propagation, and the final fast fracture region.

引用

页码：2565 / 2575

页数：11

共 20 条

[1] Effect of welding speed on butt joint quality of Ti-6Al-4V alloy welded using a high-power Nd:YAG laser [J].

Cao, X. ;

Jahazi, M. .

OPTICS AND LASERS IN ENGINEERING, 2009, 47 (11) :1231-1241

[2] Gap-free fibre laser welding of Zn-coated steel on Al alloy for light-weight automotive applications [J].

Chen, Hui-Chi ;

Pinkerton, Andrew J. ;

Li, Lin ;

Liu, Zhu ;

Mistry, Anil T. .

MATERIALS & DESIGN, 2011, 32 (02) :495-504

[3] CO2 laser welding of galvanized steel sheets using vent holes [J].

Chen, Weichiat ;

Ackerson, Paul ;

Molian, Pal .

MATERIALS & DESIGN, 2009, 30 (02) :245-251

[4] Microstructure and microhardness of fiber laser butt welded joint of stainless steel plates [J].

Cui, C. Y. ;

Cui, X. G. ;

Ren, X. D. ;

Liu, T. T. ;

Hu, J. D. ;

Wang, Y. M. .

MATERIALS & DESIGN, 2013, 49 :761-765

[5] Microstructure and mechanical properties of laser welded dissimilar DP600/DP980 dual-phase steel joints [J].

Farabi, N. ;

Chen, D. L. ;

Zhou, Y. .

JOURNAL OF ALLOYS AND COMPOUNDS, 2011, 509 (03) :982-989

[6] Evolution of the phase composition and defect substructure in the surface layer of rail steel under fatigue [J].

Grishunin V.A. ;

Gromov V.E. ;

Ivanov Y.F. ;

Volkov K.V. ;

Konovalov S.V. .

Steel in Translation, 2013, 43 (11) :724-727

[7] Hardening characteristics of CO2 laser welds in advanced high strength steel [J].

Han, Tae-Kyo ;

Park, Bong-Gyu ;

Kang, Chung-Yun .

METALS AND MATERIALS INTERNATIONAL, 2012, 18 (03) :473-479

[8] A review on hot stamping [J].

Karbasian, H. ;

Tekkaya, A. E. .

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 2010, 210 (15) :2103-2118

[9]

Kim Chang Rok, 2010, [JOURNAL OF LEGISLATION RESEARCH, 법제연구], V39, P79

[10] Normal Hall-Petch behavior of mild steel with submicron grains [J].

Liu, MY ;

Shi, B ;

Wang, C ;

Ji, SK ;

Cai, X ;

Song, HW .

MATERIALS LETTERS, 2003, 57 (19) :2798-2802

← 1 2 →