Aging kinetics of 17-4 PH stainless steel

Mirzadeh, Hamed; Najafizadeh, A.

doi:10.1016/j.matchemphys.2009.02.049

Cited by 126 publications

(57 citation statements)

References 31 publications

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“…Viswanathan et al 31) reported that there was no any incubation period for the onset of Cu-rich precipitation in a 17-4 precipitation hardening stainless steel. Same result was also reported by Mirzadeh et al 32) These simulation predictions and experimental results made it possible for auto-aging precipitation in 2.0 Cu steel at such cooling rate. It indicates that the 2.0 Cu steel had a very short incubation period for the Cu-rich phase precipitation.…”

Section: Precipitation Of Cu-rich Phasesupporting

confidence: 85%

Dynamic Continuous Cooling Transformation Behavior of A Novel Cu-bearing Pipeline Steel

et al. 2016

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Section: Precipitation Of Cu-rich Phasesupporting

confidence: 85%

Dynamic Continuous Cooling Transformation Behavior of A Novel Cu-bearing Pipeline Steel

et al. 2016

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“…7,11,12) However, in order to characterize hot deformed samples, the prior austenite grain boundaries (PAGBs) should be revealed. The difficulty to reveal the PAGBs in steels is mainly due to the existence of martensite microstructure.…”

Section: Metallographymentioning

confidence: 99%

“…Its ability to develop high strength without the catastrophic loss of ductility and its superior corrosion resistance to other steels of similar strength, have made it very attractive to designers and engineers. 7) Hot deformation processing such as forging for this steel is conducted in the temperature range of stability of austenite phase. 8) Due to the low stacking fault energy of austenite in the 17-4 PH stainless steel, the major restoration process during hot deformation is dynamic recrystallization (DRX).…”

Section: Introductionmentioning

confidence: 99%

Hot Deformation and Dynamic Recrystallization of 17-4 PH Stainless Steel

Mirzadeh

Najafizadeh

2013

ISIJ Int.

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The hot deformation behavior of a 17-4 PH stainless steel was investigated by compression tests. The typical single-peak dynamic recrystalization (DRX) behavior and also a transition state between single and multiple peak (cyclic) behaviors were seen in the resultant flow curves. The application of constitutive equations for determination of hot working constants was critically discussed. As a result, the deformation activation energy and the stress multiplier in the hyperbolic sine equation were determined as 337 kJ/mol and 0.011, respectively. The Zener-Hollomon parameter (Z) exponents for peak stress and peak strain based on the power relationships were determined as 0.18 and 0.11, respectively. The normalized critical stress and strain for initiation of DRX were respectively found to be 0.89 and 0.47. The prior austenite grain boundaries (PAGB) were revealed by electrolytic etching of the martensite in order to study the microstructure of hot deformed samples. Significant grain refinement occurred as a result of necklace DRX mechanism. The average dynamically recrystallized grain size was related to Z and peak stress by power equations with exponents of -0.25 and -1.24, respectively. A DRX map was developed to show the effect of deformation conditions on the occurrence of DRX and on the final grain size.

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“…Contains 3.3 wt% Cu which precipitates out upon ageing and produces precipitation hardening [1,2]. Before welding the X5CrNiCuNb16-4 sheets together, they were super saturated with Cu.…”

Section: Resultsmentioning

confidence: 99%

“…This steel is strengthened by precipitation of copper rich phases in the martensitic matrix by aging treatment [1,2,3,4]. The second alloy type that is used in this study is X4CrNiSiTi14-7, which is a high tensile strength precipitation hardening stainless steel with martensitic microstructure.…”

Section: Introductionmentioning

confidence: 99%

Localized ageing in the heat affected zone of welded X5CrNiCuNbl6-4 and X4CrNiSiTi14-7 sheets

Sakhawat¹,

Falahati

Degischer

et al. 2014

IOP Conf. Ser.: Mater. Sci. Eng.

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View the article online for updates and enhancements. Abstract. Localized ageing and corresponding microstructural developments as a result of welding heat in the heat-affected zone (HAZ) of two different precipitation-hardened Cr-Steels (X5CrNiCuNb16-4 and X4CrNiSiTi14-7) have been studied. The X5CrNiCuNb16-4 sheet was in solution annealed condition and X4CrNiSiTi14-7 sheet was in peak aged condition. The results showed that despite of initial heat treated condition, the fusion zone formed in both welded sheets has typical cast structure. The HAZ has different microstructure compared to fusion zone and base metal. The HAZ is found to be sensitive to the welding heat and was aged locally due to thermal effects of welding. This localized ageing forms regions in HAZ varying from over-aged to under aged, depending upon the initial ageing condition of the base sheet.

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Aging kinetics of 17-4 PH stainless steel

Cited by 126 publications

References 31 publications

Dynamic Continuous Cooling Transformation Behavior of A Novel Cu-bearing Pipeline Steel

Dynamic Continuous Cooling Transformation Behavior of A Novel Cu-bearing Pipeline Steel

Hot Deformation and Dynamic Recrystallization of 17-4 PH Stainless Steel

Localized ageing in the heat affected zone of welded X5CrNiCuNbl6-4 and X4CrNiSiTi14-7 sheets

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