Impact of Subsequent Pass Weld Thermal Cycles on First-Pass Coarse Grain Heat-Affected Zone’s Microstructure and Mechanical Properties of Naval Bainitic Steel

Kumar, Sanjeev; Sharma, Ashutosh; Pandey, Chandan; Basu, B.; Nath, S. K.

doi:10.1007/s11665-021-06177-2

Cited by 12 publications

(8 citation statements)

References 36 publications

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“…The hardness distribution in welded joint was closely associated to the microstructure characteristics. [5][6] Microstructure in HAZ near the fusion line was mainly composed of Martensite, thereby making the hardness value increase obviously. What is more, Martensite content decreased obviously from the fusion line to BM, thereby making a sharp decrease in HAZ hardness.…”

Section: Hardness Distribution In Multi-pass Butt-welded Jointmentioning

confidence: 99%

“…3 A large grain size along with phase transformation products such as Martensite and Bainite rendered the multi-pass welded joint weak. 4–5 In addition, these hard and brittle products increased the hardness and made multi-pass welded joint sensitive to stress and corrosion. 6 For low carbon steel welded joint, hardness was a measure of tensile strength and provided an indication of the degree of embrittlement.…”

Section: Introductionmentioning

confidence: 99%

“…Through the experiment of microstructure and the hardness property, the microstructure in welded joint was observed and the influence on the hardness property was investigated. 2,[4][5]8 It was difficult to determine the microstructure evolution process by experimental methods, while the prediction method was an effective tool to simulate the metallurgical transformation process during the welding process. [9][10][11] Sun et al 12 conducted the numerical sensitivity analyses to clarify the effect of temperature-and phase-dependent yield strength on the predicted residual stresses in ultra-high-strength steel S960 weldments.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure analysis and hardness prediction based on microstructure evolution theory in multi-pass welded joint

Zhang

Zhuo

Zhou

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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During multi-pass butt-welding of high-strength steel (HSS) thick plate, it is difficult to estimate the hardness performance of thick weld since multi thermal cycles can drive complex microstructure evolution. In this study, butt-welded joint of 75 mm-thick Q690 HSS was prepared by multi-pass shielded metal arc welding (SMAW) in advance, meanwhile experiments were carried out to characterize microstructure and measure hardness distribution in butt-welded joint. Then the welding temperature history of butt-welded joint was numerically examined. Based on the irreversibility of Martensite and Bainite, the microstructure evolution model was modified to predict the complicated microstructure evolution in multi-pass welded joint. Compared with experimental data, the validity of modified microstructure evolution model was verified. With the application of simulated thermal cycles and material chemical compositions as input parameters, volume fraction distribution of each phase was obtained by modified microstructure evolution model and hardness value was calculated by hardenability algorithm. Both experimental and predicted results exhibited that microstructure in weld metal (WM) is mainly composed of granular Bainite with a small amount of Ferrite and Martensite, and heat-affected zone (HAZ) consists of predominantly lath Martensite. Hardness distribution in butt-welded joint obtained by the prediction method is in accordance with the measurement. Average hardness value in WM and BM is 290 VPN and 250 VPN. A sharp decrease in HAZ hardness can be found from the fusion line to base metal (BM). The maximal value is in the HAZ close to fusion line and the corresponding prediction deviation is 6%.

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Section: Hardness Distribution In Multi-pass Butt-welded Jointmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructure analysis and hardness prediction based on microstructure evolution theory in multi-pass welded joint

Zhang

Zhuo

Zhou

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Too low of a Ti content provokes inadequate precipitation strengthening, whereas too much Ti will result in the redundant Ti reacting with C or N, generating large-sized inclusions, i.e., TiN, Ti(N, C), or (Ti, V, Nb)(N, C), etc. It is well-known that these large-sized inclusions present irregular shapes and easily become the crack sources under stress [13,14]. This will severely weaken the plasticity, toughness, and fatigue properties of the steels.…”

Section: Introductionmentioning

confidence: 99%

The Nb-V-Ti-N-C System Microelements Coupling Precipitation Behavior and Its Effects on Properties in High Strength Naval Steel

Zhang

Wang

et al. 2022

Metals

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The Nb-V-Ti-N-C system microelements coupling precipitation behavior in high strength naval steel was thermodynamically analyzed. The effects of micron/nano particles on the microstructure, mechanical properties, and corrosion resistance were also studied by an in situ scanning electron microscopy (SEM) tensile test, transmission electron microscopy (TEM) analysis, and electrochemical polarization measurements. The results show that the solid solution amount of Nb, V, Ti, N, or C decreases in the steels as the temperature decreases. Carbonitrides begin to precipitate at 1506.39 °C in N1 steel, and the carbonitrides are nano-scale. Meanwhile, carbonitrides begin to precipitate at 1628.74 °C in N2 steel, which is 116.69 °C higher than the corresponding liquidus temperature of 1512.05 °C; carbonitrides with micron scale are formed in the metal melt. The tensile test revealed that with the increase in titanium content from 0.05% to 0.1%, the strength increases while the elongation decreases. The in situ SEM test results indicated that lower plasticity are associated with the carbonitrides of micron-scale, which are the micro crack sources under stress. Polarization test results indicated that pitting corrosion may easily occur at the abnormally large-sized (Nb, V, Ti)(C, N) carbonitrides.

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“…CCT diagram of CGHAZ provides information about phase transformation over a wide range of cooling rates, which helps to optimize the welding heat input to obtain the desired microstructure for a particular application [15]. Kumar et al performed a thermal physical simulation of reheated coarse grain heat-affected zone and concluded that multi mass welding helps to improve the mechanical properties of the welded joint [16].…”

Section: Introductionmentioning

confidence: 99%

Physical simulation on Joining of 700 MC steel: A HAZ and CCT curve study

Roshan¹,

Naik²,

Saxena³

et al. 2022

Mater. Res. Express

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In the present work, a coarse grain heat-affected zone (CGHAZ) was simulated by Gleeble 3800 thermo-mechanical simulator. A continuous cooling transformation (CCT) diagram was generated from the results of the dilatometer, hardness, and microstructure analysis. The heating rate of 100°C/s, the peak temperature of 1300°C, the holding time of one second, and thirteen different cooling conditions representing the actual welding condition were chosen here for simulation where the cooling rate was controlled by t8/3. At slow cooling rate ferrite, cementite, pearlite, and bainite were obtained. At a medium cooling rate, ferrite, bainite, and a small amount of martensite were observed. At a fast-cooling rate i.e., 100°Cs-1 fully martensite was obtained. The obtained hardness values were 225 HV, 263 HV, and 342 HV for slower, medium, and fast cooling rates respectively. The increase in hardness value shows that the amount of non-diffusional phases increases with an increase in cooling rate. The CCT curve shows the range of cooling rate and phase transformation temperature of ferrite, bainite, and martensite.

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Impact of Subsequent Pass Weld Thermal Cycles on First-Pass Coarse Grain Heat-Affected Zone’s Microstructure and Mechanical Properties of Naval Bainitic Steel

Cited by 12 publications

References 36 publications

Microstructure analysis and hardness prediction based on microstructure evolution theory in multi-pass welded joint

Microstructure analysis and hardness prediction based on microstructure evolution theory in multi-pass welded joint

The Nb-V-Ti-N-C System Microelements Coupling Precipitation Behavior and Its Effects on Properties in High Strength Naval Steel

Physical simulation on Joining of 700 MC steel: A HAZ and CCT curve study

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