Effect of heat input on dissimilar welds of ultra high strength steel and duplex stainless steel: Microstructural and compositional analysis

Tasalloti, H.; Kah, Paul; Martikainen, Jukka

doi:10.1016/j.matchar.2016.11.014

Cited by 47 publications

(27 citation statements)

References 42 publications

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“…Furthermore, the microstructure formations during the transformations also impacted the characteristics of the weld joint. The observations are supported by Yan et al [25], who defined the micro-alloying elements (Ni, Cr, and Mo) as the key components that affect the mechanical and microstructure formation in the HAZ. Ali et al [38] noted that the YS and UTS of low-carbon bainitic steel increase due to the refinement of prior austenite grain size.…”

Section: Tensile Test Analysissupporting

confidence: 56%

“…The typical SEM microstructure of 960QC steel is illustrated in Figure 7b, which shows a composition of fine M and B formed in the rolling direction. The appearance of M as a form of elongation prior to austenite grains in the rolling direction is also observed [25]. When the heat input was reduced, using 7 kJ/cm (Figure 6b), the average hardness value of the base S700MC steel as approximately 270-280 HV5.…”

Section: Hardness Analysis Of the Dissimilar Weld Jointsmentioning

confidence: 67%

“…A decrease in the heat input caused a decrease in the strength and the formation of ferrite (F) and bainite (B) in the microstructure [20][21][22][23][24]. The same behaviors were observed when Tasalloti et al [25] used the GMA welding process to weld S960QC/S32205 HSS and duplex stainless steel. They demonstrated that there is a relationship between the welding parameters and the microstructure behavior, especially for HSS in the HAZ of the weld joint.…”

Section: Introductionmentioning

confidence: 85%

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Effect of Heat Input and Undermatched Filler Wire on the Microstructure and Mechanical Properties of Dissimilar S700MC/S960QC High-Strength Steels

Bayock

Kah

Mvola

et al. 2019

Metals

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The effect of heat input on the microstructure and mechanical properties of dissimilar S700MC/S960QC high-strength steels (HSS) using undermatched filler material was evaluated. Experiments were performed using the gas metal arc welding process to weld three samples, which had three different heat input values (i.e., 15 kJ/cm, 7 kJ/cm, and 10 kJ/cm). The cooling continuous temperature (CCT) diagrams, macro-hardness values, microstructure formations, alloy element compositions, and tensile test analyses were performed with the aim of providing valuable information for improving the strength of the heat-affected zone (HAZ) of both materials. Micro-hardness measurement was conducted using the Vickers hardness test and microstructural evaluation by scanning electron microscopy and energy-dispersive X-ray spectroscopy. The mechanical properties were characterized by tensile testing. Dissimilar welded samples (S700MC/S960QC) with a cooling rate of 10 • C/s (15 kJ/cm) showed a lower than average hardness (210 HV5) in the HAZ of S700MC than S960QC. This hardness was 18% lower compared to the value of the base material (BM). The best microstructure formation was obtained using a heat input of 10 kJ/cm, which led to the formation of bainite (B, 60% volume fraction), ferrite (F, 25% volume fraction), and retained austenite (RA, 10%) in the final microstructure of S700MC, and B (55%), martensite (M, 45%), and RA (10%), which developed at the end of the transformation of S960QC. The results showed the presence of 1.3 Ni, 0.4 Mo, and 1.6 Mn in the fine-grain heat-affected zone of S700MC. The formation of a higher carbide content at a lower cooling rate reduced both the hardness and strength.

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Section: Tensile Test Analysissupporting

confidence: 56%

Section: Hardness Analysis Of the Dissimilar Weld Jointsmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 85%

See 1 more Smart Citation

Effect of Heat Input and Undermatched Filler Wire on the Microstructure and Mechanical Properties of Dissimilar S700MC/S960QC High-Strength Steels

Bayock

Kah

Mvola

et al. 2019

Metals

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“…DSS has high chromium contents (19-32%), the amount of molybdenum (2-5%), and nickel contents lower than austenitic stainless steels. DSS has roughly twice the strength than austenitic stainless steels [6].…”

Section: Introductionmentioning

confidence: 95%

Microstructure Evolution and Distribution of Mechanical Properties in Shielded Metal Arc Welded Dissimilar DSS 2205 and HY80 Joints

2019

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Dissimilar welding is a unique and complex process because in each zone in the different welding area have unique structures and characteristics. The modified structure may have a significant effect on weld metal properties. In this research, the primary objective is to investigate the microstructure evolution and hardness distribution mode of a different joint HY80 steel plate and Duplex type 2205 welded by using thick weld or shielded metal arc weld (SMAW). The microstructure of weld metal zones was observed. The test plates were welded in both butt joint and fillet joint by using E309L filler metal. It was found that the 309L electrode provides the equilibrium between austenite and ferrite phase in the different weld metal zones of DSS 2205 and HY80 steel joint. The results show that hardness distribution of different joint of both butt weld and fillet weld presents sinusoidal trend, where hardness in HAZ is highest. The peak value of hardness appeared in HY 80 base metal near the fusion line. The microstructure of base metal DSS 2205 shows fine grains of ferrite and austenite grains with dark and light shades respectively. The microstructure of weld metal shows coarse grains of austenite along with some slag inclusions as dark spots. The Heat Affected Zone of HY80 steel plate shows coarse grains of austenite and ferrite, while the heat affected zone of DSS 2205 shows thin fusion line with coarse grains of ferrite as dark zones and coarse grains of austenite as light zones. There is, a degree of variation in weld metal ferrite content was observed. Keywords: Duplex Stainless Steel, HY80, SMAW, Dissimilar Joint, Hardness, and Impact Toughness.

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“…[5] To mitigate the manufacturing complexity of large-scale structures, many such applications require UHSS to be welded. Thus, weldability of these steels was investigated using various welding processes (including laser welding [LW], [6][7][8][9] tungsten inert gas [TIG] welding, [10][11][12] gas-metal arc welding [GMAW], [13,14] electron beam welding [EBW], [15,16] and plasma arc welding [PAW] [17,18] ). Common defects and difficulties associated with their welding are cold cracking, [7] decrease in toughness, [19] lack of ductility, [20] decrease in strength, [15] and softening of heat-affected zone (HAZ).…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Inertia‐Friction‐Welded Fe–Cr–Ni–Mo High‐Strength Steel

Zai

You

Tong

et al. 2020

steel research int.

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Inertia friction welding (IFW) is a solid‐state welding technology that avoids defects associated with molten weld processes; however, this process has rarely been used to weld ultrahigh‐strength steel (UHSS). Herein, 32CrMnSi2Ni6MoV UHSS is joined successfully via IFW. The mechanical properties after welding at different rotational speeds and the microstructure at 2800 rpm are studied in detail. The temperature distributions in the peripheral and central areas are modeled according to the temperature at the weld zone. The microstructural transformation is analyzed for different temperature intervals, and the microstructural characteristics of each interval correspond to the actual microstructure of the welded joint according to the temperature distribution model. High‐strength martensite forms at the weld zone, and the thermomechanical‐affected zone (TMAZ) in the peripheral region is divided into phase transformation zone, partial recrystallization zone, and plastic deformation zone, whereas the TMAZ in the central region includes only the partial recrystallization and pure plastic deformation zones. This difference is due to the higher frictional heat caused by the higher peripheral linear velocity during rotation. A tensile test shows that fracture occurs in the base metal (BM) region, and the yield strength, tensile strength, and elongation are 805 MPa, 1064 MPa, and 13.88%, respectively.

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Effect of heat input on dissimilar welds of ultra high strength steel and duplex stainless steel: Microstructural and compositional analysis

Cited by 47 publications

References 42 publications

Effect of Heat Input and Undermatched Filler Wire on the Microstructure and Mechanical Properties of Dissimilar S700MC/S960QC High-Strength Steels

Effect of Heat Input and Undermatched Filler Wire on the Microstructure and Mechanical Properties of Dissimilar S700MC/S960QC High-Strength Steels

Microstructure Evolution and Distribution of Mechanical Properties in Shielded Metal Arc Welded Dissimilar DSS 2205 and HY80 Joints

Microstructure and Mechanical Properties of Inertia‐Friction‐Welded Fe–Cr–Ni–Mo High‐Strength Steel

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