Distortion and Residual Stresses during Metal Quenching Process

Nallathambi, Ashok Kumar; Kaymak, Yalcin; Specht, Eckehard; Bertram, Albrecht

doi:10.1007/978-3-540-85715-0_12

Cited by 4 publications

(4 citation statements)

References 9 publications

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“…In the case of quenching simulation, the effect of the creep is always neglected (i.e. see: [3,4]), nevertheless in this work the experimental results suggest to consider this phenomenon as the heat treatment held the material at austenitising temperatures for quite long time and is followed by air cooling that presents a slow cooling rate [2]. As it will be justified in the following, a Nabarro-Herring (NH) creep law is adopted.…”

Section: Table 1 Physical and Mechanical Properties Ofmentioning

confidence: 99%

“…Many papers address the simulation of quenching (i.e. see: [3,4]). In this case, the phenomenon is manly related to the high thermal gradient, that occurs during the fast cooling process, producing a strong thermal expansion mismatch among the surface, that cools down quickly becoming instantly martensite, and the untransformed austenite hot core that is transformed later in martensite.…”

Section: Introductionmentioning

confidence: 99%

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Turbine Blade Distortion after Heat Treatment: Preliminary Experimental Investigation and FEM Analysis

Bona

Lanzutti

Lucacci

et al. 2019

KEM

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During the production process, turbine blades are subjected to a solubilization heat treatment, followed by tempering treatment, in order to obtain better mechanical properties. It is observed that, in some cases, permanent distortion can occur during the high temperature treatment (austenitising temperature). In this work, a high temperature creep resisting steel blade with a simplified geometry is considered. A finite element model is developed considering: the material properties depending on temperature, phase transformation and viscoplasticity (Nabarro-Herring and bilinear kinematic models). A nonlinear transient thermo-mechanical analysis is performed to simulate a standard thermal cycle. Material properties are partially calibrated based on dilatometric tests and partially from data available in literature. Adopting a laser scanner system, the blades geometry is measured before and after the heat treatment to calculate the permanent deflection. Comparing numerical results with experiments, it has been observed that the distortion phenomenon is mainly affected by the low-stress diffusional creep. This effect is due to the fact that, during the heat treatment, the blade is held at high temperature for a relatively long time according to a particular supporting lay-out. To minimize the permanent distortion, the numerical model permits an appropriate supporting system to be set-up, whose validity has been confirmed experimentally.

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Section: Table 1 Physical and Mechanical Properties Ofmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Turbine Blade Distortion after Heat Treatment: Preliminary Experimental Investigation and FEM Analysis

Bona

Lanzutti

Lucacci

et al. 2019

KEM

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“…Our previous works (Pietzsch et al, 2005(Pietzsch et al, , 2007Brzoza et al, 2006;Kaymak and Specht, 2007;Kaymak, 2007;Nallathambi et al, 2008) are focused to the optimum cooling strategies through a modified HTC profile which reduces the distortion and residual stresses simultaneously. Apart from the external parameters which control the quenching process, the internal parameters which significantly dominate in the quenching process are the material properties.…”

Section: Introductionmentioning

confidence: 98%

Sensitivity of material properties on distortion and residual stresses during metal quenching processes

Nallathambi

Kaymak

Specht

et al. 2010

Journal of Materials Processing Technology

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“…However, in recent years, a high-performance manufacturing process of quenching-forming-aging (Q-F-A) has been developed. This process can not only avoid severe distortion caused by quenching of components but also enhance the mechanical properties of the components further during artificial aging [5][6][7]. Therefore, the alloy undergoes quenching, i.e., solid solution treatment, before the cold forming process.…”

Section: Introductionmentioning

confidence: 99%

Effect of Natural Aging on Cold Forming Performance of 2219 Aluminum Alloy

Shi

et al. 2023

Materials

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To facilitate the manufacturing of the thin-walled components of 2219 aluminum alloy, the quenching–forming–aging (Q–F–A) process has been increasingly utilized. However, natural aging (NA) after quenching significantly affects the cold forming performance of this alloy. In this study, experiments are conducted to investigate the effect of NA time on the cold forming performance of 2219 aluminum alloy. The results indicate that NA can weaken the Portevin–Le Chatelier (PLC) effect, thereby reducing its influence on the cold forming performance of the alloy. The PLC effect becomes indistinct when the aging time reaches 2 years. The yield strength of 2219 aluminum alloy increases monotonically with aging time, while the elongation first increases rapidly and then decreases. After an aging time of 2 years, the yield strength increases by 28.6% from that of newly quenched alloys. The strain hardening index and hardening coefficient indicate that short-term NA (less than 4 days) increases the work hardening rate, while long-term NA reduces it. Microstructural analysis shows that the strengthening effect of NA on 2219 aluminum alloy is mainly due to the growth of G.P. zones and the precipitation of θ″ phases. The NA precipitation behavior can also cause the aggregation of solute atoms and weaken the PLC effect.

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Distortion and Residual Stresses during Metal Quenching Process

Cited by 4 publications

References 9 publications

Turbine Blade Distortion after Heat Treatment: Preliminary Experimental Investigation and FEM Analysis

Turbine Blade Distortion after Heat Treatment: Preliminary Experimental Investigation and FEM Analysis

Sensitivity of material properties on distortion and residual stresses during metal quenching processes

Effect of Natural Aging on Cold Forming Performance of 2219 Aluminum Alloy

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