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Chinese Journal of Materials Research  2017, Vol. 31 Issue (2): 129-135    DOI: 10.11901/1005.3093.2016.344
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Effect of Heat Input on Microstructure and Property of Weld Joints of a 1200 MPa Grade HSLA Steel
Bin XU1,2,Chengyong MA2,Li LI1(),Xiaoming XIAO2,Jianfeng WANG1,2
1 College of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093, China
2 Welding Institute, China Iron and Steel Research Institute Group,Beijing 100081,China
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Bin XU,Chengyong MA,Li LI,Xiaoming XIAO,Jianfeng WANG. Effect of Heat Input on Microstructure and Property of Weld Joints of a 1200 MPa Grade HSLA Steel. Chinese Journal of Materials Research, 2017, 31(2): 129-135.

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Abstract  

A 1200 MPa grade high-strength low-alloy (HSLA) steel was welded by metal active gas(MAG) welding method with filler material of GHS50NS welding wire by three different heat inputs. And then the effect of heat input on microstructure and property of the weld joints was investigated by means of optical microscopy, scanning electronmicroscopy, transmission electron microscopy and mechanical tests. The results indicate that the microstructure of weld joints consists mainly of acicular ferrite, a granular bainite and small amount of M-A by different heat inputs. With the increasing heat input, the amount of acicular ferrite was increased and its lath width was coarsened while the amount of granular bainite decreased, and the type of non metallic inclusions which promote the nucleation of acicular ferrite in weld joints was a complex oxide-sulfide Ti-Mn-Al-O-S. The strength and hardness of the welded joint decreases with the increase of heat input, but it has a good combination of strength and toughness. Along with the increase of heat input, the morphology of the impact fracture of the weld joint changed from fracture with mixed mode to brittle fracture. When the heat input is 20 kJ/cm, the comprehensive performance of the welded joint is the best.
Key words:  metallic materials      HSLA steel      heat input      weld metal      microstructure      mechanical properties     
Received:  19 June 2016     
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Bin XU
Chengyong MA
Li LI
Xiaoming XIAO
Jianfeng WANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.344     OR     https://www.cjmr.org/EN/Y2017/V31/I2/129

Fig.1  Microstructure of base metal
Material C Si Mn Ni Co Cu Mo Cr
Steel 0.20 0.53 1.32 0.36 0.009 0.013 0.25 0.56
Deposited metal 0.083 0.49 1.00 0.35 -- 0.34 0.13 --
Table 1  Composition of experimental steels and deposited metal of GHS50NS (mass fraction,%)
Material Tensile strength
Rm/MPa		 Yield strength
Rp0.2/MPa		 Elongation
A/%		 Section shrinkage Z/% AKV(-40℃) /J
Steel 1464 1246 12.5 60 24
Deposited metal 605 524 26.5 71 110
Table 2  Mechanical properties of experimental steels and deposited metal of GHS50NS
Fig.2  Groove size of the test plate (unit: mm)
Fig.3  Morphologies of welds with different heat inputs(a) 16 kJ/cm ,(b) 20 kJ/cm, (c) 25 kJ/cm
Fig.4  TEM micrographs of welds with different heat inputs (a) 16 kJ/cm, (b) 20 kJ/cm, (c) 25 kJ/cm
Fig.5  The energy spectrum analysis of inclusions in weld metal
Fig.6  The hardness distribution with different heat inputs
Heat input
/(kJ/cm)		 Rod tensile test of weld metal Tensile test of welded joint
Tensile strength/MPa Yield strength/MPa Elongation
/%		 Reduction of area/% Tensile strength
/MPa		 Fracture location
16 658 580 26.5 76 823 Weld
20 698 591 27.5 78 788 Weld
25 629 515 29.5 74 755 Weld
Table 3  Mechanical properties of welded joints with different heat inputs
Fig.7  Impact fractograph of weld metal with different heat inputs (a) 16 kJ/cm, (b) 20 kJ/cm, (c) 25 kJ/cm
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