scholarly journals Effects of austempering temperature on microstructure and surface residual stress of carbidic austempered ductile iron (CADI) grinding balls

China Foundry ◽  
2018 ◽  
Vol 15 (3) ◽  
pp. 173-181 ◽  
Author(s):  
Jin-hai Liu ◽  
Peng Xiong ◽  
Bin-guo Fu ◽  
Wei-ting Yang ◽  
Xue-bo Zhao ◽  
...  
Keyword(s):  
Residual Stress ◽  
Ductile Iron ◽  
Austempered Ductile Iron ◽  
Surface Residual Stress ◽  
Grinding Balls ◽  
Austempering Temperature

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.

Effect of austempering temperature on microstructure of ausferrite in austempered ductile iron

2019 ◽  
Vol 35 (11) ◽  
pp. 1329-1336 ◽  
Author(s):  
Chengduo Wang ◽  
Ruizhuo Liu ◽  
Songjie Li ◽  
Chang Gu ◽  
Xueshan Du ◽  
...  
Keyword(s):  
Ductile Iron ◽  
Austempered Ductile Iron ◽  
Austempering Temperature

Research on the Effective Rules for the Impact Toughness and Hardness of Austempered Ductile Iron (ADI) by Austempering Parameters

2014 ◽  
Vol 488-489 ◽  
pp. 3-8 ◽  
Author(s):  
Gao Lian Shi ◽  
Shao Hua Wu ◽  
Xu Hong Guo ◽  
Xing Huang
Keyword(s):  
Impact Toughness ◽  
Ductile Iron ◽  
Austempered Ductile Iron ◽  
Finite Element Software ◽  
Hardness Tests ◽  
Numerical Simulation Methods ◽  
The Common ◽  
Austempering Temperature ◽  
The Impact ◽  
Ansys Workbench

With the common engineering-purpose ductile iron used as research subject, the research on rules of austempering parameters to influence the impact toughness and hardness of austempered ductile iron (ADI) was implemented in this paper by adopting the combination of theoretical, experimental and numerical simulation methods, and setting series of austempering parameters; After the impact tests and hardness tests simulated by the finite element software - ANSYS Workbench, the simulation data were analyzed by comparing with the experimental data. The experimental results showed that: austenitizing time was longer, ADI hardness was smaller while impact toughness remained unchanged; hardness was in linearly-decreasing trend with rise of austempering temperature, while impact toughness first increased and then decreased as the austempering temperature rose, with the maximum at the temperature 350°C; The effect of austempering time on the impact toughness was very few; extension of austempering time allows the hardness to increase slightly, but only a little.

Abrasive Wear Behavior of Permanent Moulded Toughened Austempered Ductile Iron

2009 ◽  
Author(s):  
T. R. Uma ◽  
J. B. Simha ◽  
K. Narasimha Murthy
Keyword(s):  
Wear Resistance ◽  
Abrasive Wear ◽  
Ductile Iron ◽  
Wear Behavior ◽  
Structural Features ◽  
Abrasive Wear Resistance ◽  
Austempered Ductile Iron ◽  
Graphite Morphology ◽  
Abrasive Wear Behavior ◽  
Austempering Temperature

Laboratory abrasive wear tests have been reported on permanent moulded toughened austempered ductile iron. The influence of austempering temperature on the abrasive wear behavior have been studied and discussed. The results indicate that with increase in austempering temperature from 300°C to 350°C, the abrasive wear resistance increased, and as the austempering temperature increased to 400°C, there was reduction in the abrasive wear resistance. These results have been interpreted based on the structural features and graphite morphology.

Effect of Austempering Temperature on Microstructure and Properties of Carbidic Austempered Ductile Iron

2011 ◽  
Vol 284-286 ◽  
pp. 1085-1088 ◽  
Author(s):  
Jin Hai Liu ◽  
Guo Lu Li ◽  
Xue Bo Zhao ◽  
Xiao Yan Hao ◽  
Jian Jun Zhang
Keyword(s):  
Impact Toughness ◽  
Ductile Iron ◽  
Abrasion Resistance ◽  
Field Testing ◽  
Austempered Ductile Iron ◽  
Abrasive Resistance ◽  
Microstructure And Properties ◽  
Zero Rate ◽  
Austempering Temperature ◽  
The Impact

The microstructure and properties of austempered ductile iron with carbides was studied to increase the abrasive resistance of ADI. It was proven that the austempering temperature influences greatly the microstructure, impact toughness, hardness and abrasion resistance of CADI. With increase of austempering temperature, the acicular ferrite becomes thicker and bigger, the impact toughness rises, and the hardness decreases. But there is a complicated effect of austempering temperature on wet abrasion resistance. In addition, the CADI grinding balls were cast and the field testing was performed. The CADI ball is one third of abrasion loss of low chromium cast iron, zero rate of breakage and no loosing round.

Hardness and Impact Toughness of Niobium Alloyed Austempered Ductile Iron

2011 ◽  
Vol 418-420 ◽  
pp. 1768-1771 ◽  
Author(s):  
Bulan Abdullah ◽  
Siti Khadijah Alias ◽  
Ahmed Jaffar ◽  
Rashiddy Wong Freddawati ◽  
A. Ramli
Keyword(s):  
Impact Toughness ◽  
Ductile Iron ◽  
Treatment Process ◽  
Impact Test ◽  
Induction Furnace ◽  
Hardness Test ◽  
Austempered Ductile Iron ◽  
Austenitizing Temperature ◽  
Austempering Temperature ◽  
The Impact

The effect of different austempering holding times on the hardness and impact toughness of 0.254% niobium alloyed austempered ductile iron was investigated in this study. Molten ductile iron was prepared in an induction furnace with capacity of 60kg. Samples with dimension of 300m x Ø25mm in form of Y block double cylinder was constituted and solidified samples were then machined in accordance to ASTM E23 for impact test specimens. Samples were ground and polished before Rockwell hardness test was conducted. Austempering heat treatment process with austenitizing temperature of 900°C for 1 hour and austempering temperature of 350°C for 1 hour, 2 hours and 3 hour holding times were then carried out. The results from this research indicated that austempering the sample for 1 hour resulted in significant improvement of the impact toughness values but increasing the austempering holding time deficiently reduced the values. On the contrary, the hardness of niobium alloyed austempered ductile iron continues to increase with respect to longer austempering holding times.

scholarly journals Multiphase Ausformed Austempered Ductile Iron

2017 ◽  
Vol 62 (3) ◽  
pp. 1493-1498 ◽  
Author(s):  
M. Soliman ◽  
H. Palkowski ◽  
A. Nofal
Keyword(s):  
Microstructure Evolution ◽  
Ductile Iron ◽  
Intercritical Annealing ◽  
True Strain ◽  
Austempered Ductile Iron ◽  
Transformation Kinetics ◽  
Compression Properties ◽  
The Matrix ◽  
Microstructure Examination ◽  
Austempering Temperature

AbstractDuctile iron was subjected to a total true strain (φt) of 0.3 either by applying φtin the austenite region or by apportioning it through applying a true strain of 0.2 in the austenite region before quenching to austempering temperature (TA) of 375°C, where a true strain of 0.1 is applied (ausforming). Additionally, two types of matrices were produced in the ductile iron, namely ausferritic and ferritic-ausferritic matrices. The ferrite is introduced to the matrix by intercritical annealing after austenitization. Dilatometric measurements as well as microstructure examination showed a fast ausferrite transformation directly after applying φAand that the introduction of ferrite to the matrix resulted in a remarkable acceleration of the ausferrite formation. The transformation kinetics, microstructure evolution, hardness and compression properties are studied.

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