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Chinese Journal of Materials Research  2014, Vol. 28 Issue (10): 751-755    DOI: 10.11901/1005.3093.2014.252
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Development of Self-shield Flux Cored Wire for FV520(B) Martensite Stainless Steel
Min ZHANG(),Mingzhi LIU,Qianru SHI,Jihong LI
College of Material Science and Engineering, Xi’an University of Technology, Xi’an 710048
Cite this article: 

Min ZHANG,Mingzhi LIU,Qianru SHI,Jihong LI. Development of Self-shield Flux Cored Wire for FV520(B) Martensite Stainless Steel. Chinese Journal of Materials Research, 2014, 28(10): 751-755.

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Abstract  

According to the principle of bilaterally matching in microstructure and composition for a weld joint to a matrix alloy, a self-shield flux cored wire was made of 304 stainless steel plate as feed metal with a selected flux especially for welding of FV520 (B) martensite stainless steel. Then FV520 (B) martensite stainless steel was welded with the prepared flux-cored wire by adopting appropriate welding process parameters. The weld joints were characterized in terms of microstructure and mechanical performance. The results show that the weld joints possess excellent mechanical properties: such as a tensile strength up to 911 MPa, a yield strength up to 679.3 MPa and an impact energy value 99.7 J (20℃).The microstructure of the weld joints consisted of tempered sorbet and lath marten site, as well as a little residual austenite and carbide precipitates, which can match well with parent material.

Key words:  metallic materials      flux-cored wire      self-shielded      FV520(B) marten site stainless steel      alloying      mechanical properties     
Received:  15 May 2014     
Fund: *Supported by National High Technology Research and Development Program of China No. 2013AA031303, National Natural Science Foundation of China No.51274162, and Industrialization Cultivation Project of Education Department of Shaanxi Province No.2012JC16.

URL: 

https://www.cjmr.org/EN/10.11901/1005.3093.2014.252     OR     https://www.cjmr.org/EN/Y2014/V28/I10/751

C Si Mn P S Cr Ni Cu Mo Nb
0.04-0.07 ≤0.7 ≤1.0 ≤0.025 ≤0.025 13.0-14.5 5.0-6.0 1.3-1.8 1.3-1.8 0.25-0.45
Table 1  The chemical composition of FV520(B) (mass fraction, %)
C Si Mn P S Cr Ni N
0.07 0.075 2.0 0.045 0.030 17.5-19.5 8.0-10.5 0.1
Table 2  The chemical composition of 304 stainless steel belt (mass fraction, %)
Fig.1  Metallographic microstructure of welded joint, (a) weld area, (b) fusion area, (c) HAZ
No. Yield strength Rel/MPa Tensile strength Rm/MPa A/% Z/% Fracture location
1 705 941 19.5 69.3 Base metal area
2 641 879 21.3 69.9 Base metal area
3 692 913 18.1 68.1 Base metal area
Average 679.3 911 19.6 69.1
Table 3  Results of tensile test
Fig.2  Metallographic microstructure of welded joint, (a) weld area, (b) fusion area, (c) HAZ
Element C K Si K Cr K Mn K Fe K Ni K Mo L
0.03 0.36 24.3 1.58 64.8 5.70 3.26
Table 4  EDS Results of impact fracture of weld area (mass fraction, %)
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