Effect of Shot Peening Treatment on Forging Die Life

Chang, Shih-Cheng; Lee, Shih-Chin; Tang, Tzu-Piao

doi:10.2320/matertrans.mer2007622

Cited by 33 publications

(22 citation statements)

References 11 publications

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“…They also examined effect of processing temperature used during peening and reported enhanced peening effect at higher temperatures. Shih-Hsien Chang et al [4] claimed 100% -200% improvement in hot and cold forging die life. Most of the above mentioned research was focused on effect of shot peening on fatigue life.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Shot Peening on DIN 1.2714 Hot Work Tool Steel

Bhavar¹,

Patil²,

Kattire³

et al. 2017

MSCE

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Shot peening is one of the most popular surface enhancement technique used to improve fatigue performance of different materials. This paper focuses on to study the effect of different shot peening parameters on micro-structural and mechanical properties of DIN 1.2714 tool steel specimens. Shot peening treatments were carried out by varying shot size and peening intensity. X-ray stress analysis, micro-hardness testing and micro-structural analysis were performed to characterize these specimens. In addition, pin on disk wear testing was executed to recognize wear behavior of this shot peened tool steels. It was observed that along with compressive residual stress generation, shot peening also induces work hardening effect and modifies surface structure which are responsible for significant improvement in this tool steel.

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Section: Introductionmentioning

confidence: 99%

“…in dislocation densities, cold work and generation of compressive residual stresses are the main mechanisms responsible for these improvements [3] [4]. The effectiveness of shot peening is decided by the magnitude of compressive residual stress and its effective depth from the surface.…”

Section: Introductionmentioning

confidence: 99%

Influence of Shot Peening on DIN 1.2714 Hot Work Tool Steel

Bhavar¹,

Patil²,

Kattire³

et al. 2017

MSCE

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“…Shot peening to high hard workpieces such as cold and hot work tool steel and high speed tool steel has been researched and is used in some applications. 1,2) Shot peening media with low hardness can deform plastically at collision to workpieces with high hardness, and effects to give high compressive residual stress on hard workpieces are not large. Therefore, high hardness is required for shot peening media to obtain high compressive residual stress on hard workpiece.…”

Section: Introductionmentioning

confidence: 99%

Properties of Cold Work Tool Steel Shot Peened by 1200 <I>HV</I>-Class Fe-Cr-B Gas Atomized Powder as Shot Peening Media

Sawada

Yanagitani

2010

Mater. Trans.

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Shot peening is widely used for automobile parts such as springs and gears to improve fatigue strength. In general, high hardness media is required for shot peening to targets with high hardness. Recently, shot peening to various tool steels such as cold and hot tool steels and high speed tool steel has been investigated and is used in some applications, and improvements in fatigue strength and die life by the increase of compressive residual stress and hardness at their shot peened surface have been reported.In this study, the properties of cold work tool steel shot peened by Fe-8%Cr-6.5%B (mass%) gas atomized powder (FeCrB powder) with 1200 HV-class Vickers hardness and long life as shot peening media were examined. Quenched and tempered JIS-SKD11 followed by shot peening by FeCrB and high speed steel powder sieved between 45 and 125 mm was used.Vickers hardness and compressive residual stress of the shot peened JIS-SKD11 surface by FeCrB powder were higher than these by high speed steel powder. As a result, JIS-SKD11 shot peened by FeCrB powder showed excellent fatigue property, Charpy impact value and wear resistance property.

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“…Thermal fatigue and erosion are the most important factors limiting tool life and resulting in tool failure of hot work tool steels. 1) In the case of most steels, nitriding can be used for wear resistance and has some improvement on corrosion resistance. Using nitriding to enhance the wear, fatigue and corrosion resistance is a complex problem because of the results may be affected by related factors in the process.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Erosion Resistance on AISI H13 Tool Steel by Oxynitriding Treatment

et al. 2009

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In order to effectively improve erosion resistance and evaluate the effects of an oxy layer on AISI H13 tool steel after the oxynitriding process, this study used three different nitriding surface treatments, namely oxynitriding process 1 (using air), oxynitriding process 2 (using steam) and normal gas nitride. To evaluate the effects of microstructure and the erosion resistance of AISI H13 tool steel after different nitride processes, evaluated micro hardness, erosion tests and SEM microstructure inspections were conducted. Experimental results showed that the oxide layer can protect and improve the aluminum erosion for AISI H13 tool steel. Erosion tests of 2 and 4 h for oxynitriding process 1 could produce a thicker and complex oxide layer, which has higher hardness (HV 1021.9) and optimal weight loss (0.16 %). This procedure is proven to effectively reduce the ratio of Al-Fe-Si compounds during the A380 alloy erosion test.KEY WORDS: erosion resistance; AISI H13 tool steel; oxynitriding; A380 alloy. 421© 2009 ISIJ erosion test as shown in Fig. 1(b). The specimen was then dipped in aluminum alloy A380 for melting and maintained at 1 023 K. The rotational speed of the specimen was kept at 50 rpm. The dip time was 2 and 4 h for specimens to evaluate the erosion resistance and weight loss. After removing the aluminum, the specimens were cleaned with NaOH to remove oxide or other residues. The weight loss percentage of the erosion test was calculated as follows:IW is the initial weight and AW is the weight of after erosion test. In the experiment, three different kinds of surface treatments were: 1) normal gas nitriding: at temperature of 843 K for 1 h; 2) oxynitriding process 1: gas nitriding was carried out at temperature of 843 K for 1 h, and air oxidation at 823 K for 3 h; 3) oxynitriding process 2: gas nitriding was carried out at temperature of 803 K for 1 h, and steam oxidation at 798 K for 1 h. To evaluate the effects of erosion resistance on AISI H13 tool steel by nitriding process, erosion test, surface hardness and microstructure inspections were performed. Microhardness tests were measured by HV with loading of 200 g, which complied with the CNS 2115 Z8004 standard. Results and DiscussionThe microstructure of AISI H13 tool steel substrate obtained after quenching and tempering processes is shown in Fig. 2. This is the typical microstructure obtained through commercial heat treatment, which comprises the structure of tempered martensite and proeutectoid carbides. Figure 3 shows the microhardness test of AISI H13 tool steel after gas nitriding and different oxynitriding treatments. Gas nitriding was done with ammonia, decomposition NH 3 was used to dilute the ammonia so that it was not too aggressive. Normally, pure decomposition NH 3 is used to reduce the compound layer (white layer). Both carbon content and alloying additions raise surface hardness, thereby enhancing wear resistance. The actual hardness of the compound layer is usually substantially higher. However, a better thickness of the compound l...

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Effect of Shot Peening Treatment on Forging Die Life

Cited by 33 publications

References 11 publications

Influence of Shot Peening on DIN 1.2714 Hot Work Tool Steel

Influence of Shot Peening on DIN 1.2714 Hot Work Tool Steel

Properties of Cold Work Tool Steel Shot Peened by 1200 <I>HV</I>-Class Fe-Cr-B Gas Atomized Powder as Shot Peening Media

Enhancement of Erosion Resistance on AISI H13 Tool Steel by Oxynitriding Treatment

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