A study of exhaust valve and seat insert wear depending on cycle numbers

Chun, Keyoung Jin; Kim, Jae Hak; Hong, Jae Soo

doi:10.1016/j.wear.2007.02.006

Cited by 41 publications

(40 citation statements)

References 15 publications

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“…The corresponding temperature-dependent parameters in the equations are listed in Equation (8), where k 10 , B 0 , E 0 , Q 10 , A 10 , A 00 , C r0 , G 10 are material constants. Q K , Q B , Q E , Q Q , Q A , Q A00 , Q C , Q G represent thermal activation parameters in Equation (8). R g = 8.31 J·mol −1 ·K −1 is the universal gas constant, and T is the categorical temperature in K:…”

Section: Constitutive Equations and Microstructural Model Of 21-4nmentioning

confidence: 99%

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Predicting the Microstructure of a Valve Head during the Hot Forging of Steel 21-4N

Huang

et al. 2018

Metals

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Abstract:Valve microstructure is important during hot forging. Austenitic 21-4N steel is often used in exhaust valves. In this study, the microstructure evolution of the forging valve process was predicted using the internal state variables (i.e., average grain size, recrystallized fraction, and dislocation density) modus for 21-4N. First, 21-4N was subjected to hot compression tests on a Gleeble-1500D and static grain growth tests in a heating furnace. A set of uniform viscoplastic constitutive equations was established based on experimental data. Next, the determined unified constitutive equations were conducted in DEFORM-3D, and the microstructure evolution of 21-4N during forging was calculated. Finally, the simulation results of grain size evolution were validated via experiments. Results showed good consistency between the simulations and experiments. Thus, the models adequately predicted the microstructure evolution.

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Section: Constitutive Equations and Microstructural Model Of 21-4nmentioning

confidence: 99%

“…Thus, the quality of the valve head is important. The valve microstructure is a main factor in future engine applications [6][7][8]. Austenitic 21-4N stainless steel is widely used for valves because of its good balance between strength and toughness and good wear resistance in an extreme working environment [9].…”

Section: Introductionmentioning

confidence: 99%

Predicting the Microstructure of a Valve Head during the Hot Forging of Steel 21-4N

Huang

et al. 2018

Metals

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“…Keyoung Jin Chun et al 16 investigated the wear of the seating faces of the exhaust valve and seat insert that influence an engine's performance depending on the mileage (cycle numbers). Exhaust valves and seat inserts that are commonly used for commercial vehicles were used as test specimens.…”

Section: Literature Surveymentioning

confidence: 99%

Wear resistance enhancement in cryotreated En 52 and 21-4N valve steels

Jaswin

Shankar²,

Lal

2010

Int. J. Precis. Eng. Manuf.

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This experimental study investigates the wear resistance improvement in En 52 and 21-4N valve steels through shallow and deep cryogenic treatment using a reciprocatory friction and wear monitor as per the ASTM standard G-133. It has been observed that the wear resistance of En 52 and 21-4N has improved by 81.15% & 13.49% respectively, due to shallow cryogenic treatment, 86.54% & 22.08% respectively, due to deep cryogenic treatment, when compared to the conventional heat treatment. The microstructural study suggests that the improvement in wear resistance and hardness is attributed to the conversion of retained austenite into martensite, along with precipitation and distribution of the carbides brought in by the cryogenic treatment.

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“…Some works have investigated the effects of the combustion pressure [8], the valve velocity [9], the fuel type [10], the cycle number [11], the high temperature [12] [13], the wear in valves of heavy duty engines [14] [15] and the effect of applying different hardening processes on the valve/seat insert interface [16] [17] [18] [19]. The operation temperature of inlet valves is between 180˚C and 360˚C [12].…”

Section: Introductionmentioning

confidence: 99%

Sliding Wear Study on the Valve-Seat Insert Contact

Vera-Cárdenas¹,

Lewis²,

Slatter³

2017

OJAppS

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The aim of this work was to investigate the sliding wear coefficient k, using an experimental sliding wear study on the valve-seat insert contact. Commercial inlet valve and seat inserts were used as test specimens. The tests were performed at room temperature and at 200˚C, using test duration of 72,000 cycles and 18,000 cycles, respectively, and both in dry sliding conditions. A load of 5 N, an average speed of 22 mm/s and sliding distance of 2.2 mm were used for all tests. The sliding wear coefficients were calculated using experimental and analytical methods. The wear volume was higher in the tests at 200˚C both in valve and seat insert specimens. The principal wear mechanisms observed in valve specimen were oxidation and abrasion.

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A study of exhaust valve and seat insert wear depending on cycle numbers

Cited by 41 publications

References 15 publications

Predicting the Microstructure of a Valve Head during the Hot Forging of Steel 21-4N

Predicting the Microstructure of a Valve Head during the Hot Forging of Steel 21-4N

Wear resistance enhancement in cryotreated En 52 and 21-4N valve steels

Sliding Wear Study on the Valve-Seat Insert Contact

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