scholarly journals Residual stress and retained austenite in induction hardened ductile iron camshafts

2012 ◽  
Author(s):  
H. Ma ◽  
R. J. Bowers ◽  
D. O. Northwood ◽  
X. Sun ◽  
P. J. Bauerle
Keyword(s):  
Residual Stress ◽  
Ductile Iron ◽  
Retained Austenite

Heat Treatment Effects on Distortion, Residual Stress, and Retained Austenite in Carburized 4320 Steel

2014 ◽  
Vol 783-786 ◽  
pp. 692-697 ◽  
Author(s):  
Andrew Clark ◽  
Randy J. Bowers ◽  
Derek O. Northwood
Keyword(s):  
Heat Treatment ◽  
Residual Stress ◽  
Retained Austenite ◽  
Compressive Residual Stress ◽  
Surface Residual Stress ◽  
Depth Profiles ◽  
Size And Shape ◽  
Austenite Content ◽  
Treatment Conditions ◽  
The Difference

The effects of heat treatment on distortion, residual stress, and retained austenite were compared for case-carburized 4320 steel, in both the austempered and quench-and-tempered condition. Navy C-ring samples were used to quantify both size and shape distortions, as well as residual stress. The austempering heat treatment produced less distortion and a higher surface residual stress. Both hoop and axial stresses were measured; the difference between them was less than seven percent in all cases. Depth profiles were obtained for residual stress and retained austenite from representative C-ring samples for the austempered and quench-and-tempered heat treatment conditions. Austempering maintained a compressive residual stress to greater depths than quench-and-tempering. Quench-and-tempering also resulted in lower retained austenite amounts immediately beneath the surface. However, for both heat treatments, the retained austenite content was approximately one percent at depths greater than 0.5 mm.

scholarly journals X-Ray Residual Stress and Strain-Induced Transformation of Retained Austenite in TRIP-Aided Dual-Phase Steels.

1995 ◽  
Vol 61 (581) ◽  
pp. 80-86 ◽  
Author(s):  
Koh-Ichi Sugimoto ◽  
Mitsuyuki Kobayashi ◽  
Hidehiro Matsushima ◽  
Shun-ichi Hashimoto
Keyword(s):  
Residual Stress ◽  
Retained Austenite ◽  
Stress And Strain ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
X Ray

Retained Austenite Transformation-Induced Residual Stress Change in Carburized 16MnCr5 Steel

2022 ◽  
Vol 50 (3) ◽  
pp. 20210457
Author(s):  
Wanhua Liang ◽  
James Pineault ◽  
F. Albrecht Conle ◽  
Timothy H. Topper
Keyword(s):  
Residual Stress ◽  
Retained Austenite ◽  
Stress Change ◽  
Austenite Transformation

Effect of Cutting Parameters on the Surface Residual Stress of Face-Milled Pearlitic Ductile Iron

2017 ◽  
Vol 4 (1) ◽  
pp. 38-52
Author(s):  
Olutosin Olufisayo Ilori ◽  
Dare A. Adetan ◽  
Lasisi E. Umoru
Keyword(s):  
Residual Stress ◽  
Fluid Flow ◽  
Flow Rate ◽  
Ductile Iron ◽  
Cutting Parameters ◽  
Cutting Fluid ◽  
Depth Of Cut ◽  
Fluid Flow Rate ◽  
Surface Residual Stress ◽  
Average Surface

The study determined the effect of cutting parameters on the surface residual stress of face-milled pearlitic ductile iron with a view to enhancing surface integrity of machined parts in the manufacturing industries. The pearlitic ductile iron used for this study was prepared and four cutting parameters were considered. The results obtained showed that the average surface residual stress of the machined surfaces was tensile and increased significantly with increase in depth of cut. Feed rate and cutting speed exhibited some effect, though not statistically significant, on average surface residual stress. The average residual stress was found to decrease significantly and drastically from 605.39 MPa to 101.72 MPa as cutting fluid flow rate increased from 0 ?/min to 4 ?/min. The study concluded that out of all four cutting parameters investigated, the cutting fluid flow rate has most considerable influence on the surface residual stress of the machined pearlitic ductile iron.

scholarly journals Phase Transition Kinetics in Austempered Ductile Iron (ADI) with Regard to Mo Content

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5266
Author(s):  
Martin Landesberger ◽  
Robert Koos ◽  
Michael Hofmann ◽  
Xiaohu Li ◽  
Torben Boll ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Phase Transformation ◽  
Neutron Diffraction ◽  
Ductile Iron ◽  
Retained Austenite ◽  
Length Change ◽  
Atom Probe ◽  
Carbon Accumulation ◽  
Austempered Ductile Iron ◽  
Mo Content

The phase transformation to ausferrite during austempered ductile iron (ADI) heat treatment can be significantly influenced by the alloying element Mo. Utilizing neutron diffraction, the phase transformation from austenite to ausferrite was monitored in-situ during the heat treatment. In addition to the phase volume fractions, the carbon enrichment of retained austenite was investigated. The results from neutron diffraction were compared to the macroscopic length change from dilatometer measurements. They show that the dilatometer data are only of limited use for the investigation of ausferrite formation. However, they allow deriving the time of maximum carbon accumulation in the retained austenite. In addition, the transformation of austenite during ausferritization was investigated using metallographic methods. Finally, the distribution of the alloying elements in the vicinity of the austenite/ferrite interface zone was shown by atom probe tomography (APT) measurements. C and Mn were enriched within the interface, while Si concentration was reduced. The Mo concentration in ferrite, interface and austentite stayed at the same level. The delay of austenite decay during Stage II reaction caused by Mo was studied in detail at 400 °C for the initial material as well as for 0.25 mass % and 0.50 mass % Mo additions.

Effect of Residual Stress in Ductile Iron Component on its Natural Frequency

2011 ◽  
Vol 308-310 ◽  
pp. 967-972 ◽  
Author(s):  
Xue Wu Dong ◽  
Dai Ren ◽  
Dong Qiang Wang ◽  
Ya Fei Zhai
Keyword(s):  
Residual Stress ◽  
Natural Frequency ◽  
Ductile Iron ◽  
Diffraction Method ◽  
Stress Relief ◽  
Quantitative Relation ◽  
Frequency Variation ◽  
Natural Stress ◽  
The Status ◽  
Natural Frequency Variation

In the paper four components of ductile iron cast in different stress status, including the cast status, the status of vibratory stress relief and the status of thermal stress relief with 3 months of the natural stress relief and 10 years of the natural stress relief, are selected.X-ray diffraction method is used to measure residual stress and experimental modal analysis is for measuring natural frequency. A quantitative relation between residual stress in ductile iron cast component and its natural frequency variation is obtained. Thus we provide a reference for using natural frequency to evaluate the macroscopic residual stress of ductile iron material component. The results show that the peak value variation of macro residual stress in ductile iron component have a logarithmic relation to its natural frequency variation, and same as the mean value variation in macro-residual stress and its natural frequency variation.

Characteristics of the Transformation of Retained Austenite in Tempered Austempered Ductile Iron

2017 ◽  
Vol 26 (5) ◽  
pp. 2095-2101 ◽  
Author(s):  
Bingxu Wang ◽  
Gary Barber ◽  
Xichen Sun ◽  
Michael Shaw ◽  
Phil Seaton
Keyword(s):  
Ductile Iron ◽  
Retained Austenite ◽  
Austempered Ductile Iron
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