Study on Design Techniques of A Long Life Hot Forging Die With Multi-Materials

Liu, X.J.; Wang, H.C.; Li, D.W.

doi:10.1016/s1006-7191(08)60009-5

Cited by 10 publications

(4 citation statements)

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“…The laser cladding and the plasma cladding overcome the shortcomings of the traditional surface modification and have been subjected to rapid development in recent years. But it is difficult for hard coating such as laser cladding and plasma cladding coatings to attach firmly to hot forging die surface under the severe forging conditions [16] .…”

Section: Introductionmentioning

confidence: 99%

Microstructure and thermal physical parameters of Ni60-Cr3C2 composite coating by laser cladding

Pan

Wang

et al. 2010

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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To satisfy performance and long life requirements for hot forging die, Ni60-Cr 3 C 2 composite coatings were prepared on the high-speed steel W 6 Mo 5 Cr 4 V 2 using laser cladding technology. Laser clad coatings with different ratios of Ni60:Cr 3 C 2 were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy-dispersive X-ray analysis (EDX) and microhardness tester, respectively. Specific heat capacity and thermal conductivity were measured by Laser Thermal Constant Meter. Thermal expansion coefficient and elastic modulus were measured by Dynamic Mechanical Thermal Analyzer and Electro-Hydraulic Servocontrolled Testing System, respectively. The results indicated that Ni60＋50wt% Cr 3 C 2 composite coating had dense and homogeneous structure, as well as a metallurgical bonding with the substrate. With the increase of Cr 3 C 2 content, volume of chromium-containing compounds in the composite coating increased, microhardness increased and microstructure refined. The thermal physical parameters results showed that Ni60＋ 50wt% Cr 3 C 2 composite coating was overall worse than W 6 Mo 5 Cr 4 V 2 , but had a higher hot yield strength to alleviate hot fatigue and surface hot wear of hot forging die during hot forging and thus improve the service life of hot forging die.

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Section: Introductionmentioning

confidence: 99%

Microstructure and thermal physical parameters of Ni60-Cr3C2 composite coating by laser cladding

Pan

Wang

et al. 2010

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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“…When the part is removed and the die is sprayed with the lubricant, the sudden cooling of the surface reverses the stress state [7]. The maximum temperature stress is defined as [8]:…”

Section: A Thermal Stressmentioning

confidence: 99%

Sensitivity effect of elastic modulus on combined stress of hot forging die

Pan

Wang

Jialin

2010

2010 International Conference on Mechanic Automation and Control Engineering

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Stresses, including thermal, mechanical and combined stress, are the root causes leading to hot forging die failure. Stress amplitude is affected by the material properties, such as elastic modulus. In order to select die material for improving die service life, a 2D FE model of cake shaped workpiece is developed to analyze thermal, mechanical and combined stress of hot forging die with different level elastic modulus. Three kinds of stress distribution are explored. The results show that thermal stress is about 10 times than mechanical stress at the die cavity surface which is the easiest failure location, and approximate linear relationship exists between stress, including thermal and combined stress, and elastic modulus. Die material with large room temperature and temperature-sensitive elastic modulus should be selected.

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“…Brucelle et al indicat-ed that thermal stress contributed as high as 75% of the total stress field in the surface areas of hot forging die (Brucelle, 1999). Liu et al found out that the whole hot forging die could be divided into three areas during working continuously in terms of the temperature change: fluctuating area, balance area and descending area (Liu, 2007). Generally speaking, the temperature and the stress are both the highest in fluctuating area, and at a lower level in balance area or descending area.…”

Section: Introductionmentioning

confidence: 99%