“…At lower applied load, the time required for the hydrogen concentration to reach the critical value to initiate crack at the notch tip is high and during this time hydrogen would have also diffused into HAZ. Hence, the concentration of hydrogen in HAZ is more causing crack propagation through HAZ [2]. Figure 4 Microstructure of implant sample welded with 150 O C preheat and tested at 1500 kg load.…”
Section: Resultsmentioning
confidence: 99%
“…[1]. The as-quenched martensitic microstructure in the weld with hardness more than 400 VHN or so is highly susceptible to HAC, whereas bainitic or ferritic microstructure is less susceptible [1,2]. The residual tensile stresses derived from the steep thermal cycle and weld geometry, structural restraint provided during welding etc.…”
The hydrogen assisted cracking susceptibility of Modified 9Cr-1Mo steel weld is evaluated by implant test by determining lower critical stress for different preheating and combination of pre, post heating conditions. The diffusible hydrogen present in the implant specimens for different test conditions is estimated. Residual stress distribution in the weld for different heating condition is estimated using SYSWELD software. For a combination of pre + post heating at 200°C, the diffusible hydrogen content of the weld comes down to 1.17 from 4.7 mL/100g and the lower critical stress of the implant specimen increases from 250 to 370 MPa. Preheating + post heating also brings down the peak tensile residual stress level in the weld joints and lowers the cracking susceptibility.
“…At lower applied load, the time required for the hydrogen concentration to reach the critical value to initiate crack at the notch tip is high and during this time hydrogen would have also diffused into HAZ. Hence, the concentration of hydrogen in HAZ is more causing crack propagation through HAZ [2]. Figure 4 Microstructure of implant sample welded with 150 O C preheat and tested at 1500 kg load.…”
Section: Resultsmentioning
confidence: 99%
“…[1]. The as-quenched martensitic microstructure in the weld with hardness more than 400 VHN or so is highly susceptible to HAC, whereas bainitic or ferritic microstructure is less susceptible [1,2]. The residual tensile stresses derived from the steep thermal cycle and weld geometry, structural restraint provided during welding etc.…”
The hydrogen assisted cracking susceptibility of Modified 9Cr-1Mo steel weld is evaluated by implant test by determining lower critical stress for different preheating and combination of pre, post heating conditions. The diffusible hydrogen present in the implant specimens for different test conditions is estimated. Residual stress distribution in the weld for different heating condition is estimated using SYSWELD software. For a combination of pre + post heating at 200°C, the diffusible hydrogen content of the weld comes down to 1.17 from 4.7 mL/100g and the lower critical stress of the implant specimen increases from 250 to 370 MPa. Preheating + post heating also brings down the peak tensile residual stress level in the weld joints and lowers the cracking susceptibility.
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