Vibration damping capacity of deep cryogenic treated AISI 4140 steel shaft supported by rolling element bearings

Abstract

The main objective of the present study is to experimentally investigate and figure out the effect of deep cryogenic treatment in improving dynamic behaviors in terms of damping of a rotating shaft supported by rolling element bearings. An AISI 4140 steel for rotating shafts was selected for the experiments because it is the most widely used material in most industries for a wide range of applications such as machinery components, crankshafts, motor shafts, axle shafts, and railway locomotive traction motor shafts. Untreated, conventionally heat treated, deep cryogenic treated, and deep cryogenic treated and tempered shafts were used for the experiments to observe damping behavior changes of the shafts. Deep cryogenic treated and deep cryogenic treated and tempered shafts were cooled from pre-tempering temperature to -140 °C and held for tempering hold times of 12, 24, 36, and 48 hours. So, ten sets of shafts were employed for the experiment. The vibration data was captured for each of the shafts for five different shaft running speeds 600, 1200, 1800, 2400 and 3000 rpm. The results showed that damping ability of the deep cryogenic treated shaft at a hold time of 36 hours was superior to that of the others shafts.

AISI 8620 (20NiCrMo2) Çeliğinin Mekanik Özelliklerine Kriyojenik İşlemin Etkisinin İncelenmesi

“…Sonuç olarak kriyojenik işlem görmüş numunelerin çekme dayanımlarında geleneksel ısıl işlemli numunelere kıyasla % 7'lik olumlu bir artışın yaşandığını belirtmişlerdir [21]. Bu çalışmada elde edilen çekme testi sonuçlarının incelenen literatür verilerine yakın değerlerde olduğu görülmüştür [3,[17][18][19][20]. Şekil 6'da verilen yüzde uzama değerlerine bakıldığında en düşük değerin N3 numunesinde sonrasında N2 ve N1 numunelerinde olduğu görülmüştür.…”

“…Uzama değerleri çekme dayanımlarına göre ters orantılı değişim göstermiştir. Bu durum malzemelerin sünekliğine bağlıdır [1,3,[17][18][19]. Standart olan N1 numunesi diğer numunelere göre daha sünek bir yapıya sahip olduğu için daha yüksek uzama değerinde ve daha düşük çekme dayanımı değerinde kopmuştur.…”

Experimental investigation and optimization of machining parameters of deep cryogenically treated and tempered steels in electrical discharge machining process

“…Cryogenic process is a complementary process to Conventional Heat Treatment (CHT) used to enhancing physical and mechanical properties of steel materials. 1,2 It is performed in different parameters according to desired the properties of the steel materials on the purpose of increasing the effect of the cryogenic treatment. 3,4 With this method, the transformation of microstructure of austenite phase into martensite phase steels and their alloys, and form of fine carbide in cementite are provided more homogeneous distribution.…”

An active compliant docking method for large gear components based on distributed force sensor

“…Large gear components are common structural forms in the transmission system of ships and large helicopters, including input shaft and output shaft (Kam and Saruhan, 2021). Generally, the output shaft is of outer gear structure, and the input shaft is of inner gear structure (Kam et al , 2016).…”