Author: Iqbal SinghPublisher:
ISBN:
Category :
Languages : en
Pages : 334
Book Description
Influence of Microstructure and Chromium on the Fatigue Threshold and Fracture Toughness of Austempered Ductile Iron (ADI)
Author: Iqbal SinghDissertation Abstracts International
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 1006
Book Description
Fracture Toughness of Unalloyed Austempered Ductile Cast Iron (ADI)
Author: SK. PutatundaPublisher:
ISBN:
Category : Alloying elements
Languages : en
Pages : 8
Book Description
The influence of microstructure on the tensile properties and the plane strain fracture toughness (KIc) of unalloyed austempered ductile cast iron (ADI) was examined in room temperature ambient atmosphere. The crack growth mechanism during fracture toughness tests was determined through detailed fractographic studies. Compact tension and round cylindrical specimens were prepared from unalloyed ADI and were given four different austempering heat treatments to produce four different microstructures. Tensile properties and fracture toughness of these four differently heat-treated materials as well as cast materials were determined as per relevant ASTM standards.
Influence of Austempering Time and Temperature on the Fracture Toughness of Austempered Ductile Iron (ADI)
Author: Rajni GuptaMetals Abstracts
Author: Processing, Mechanical Properties, and Ballistic Impact Effects of Austempered Ductile Iron
Author: John ChinellaPublisher:
ISBN:
Category :
Languages : en
Pages : 58
Book Description
This study describes the resistance to penetration and the damage to austempered ductile iron (ADI) from ballistic impacL The resistance to penetration is determined with an average velocity with a 50% probability for complete penetration, the V-50 ballistic limit. The responses of the ADI material to impact are shown by observations of penetration modes, microstructural changes, and fracture topographies. Mechanical properties and ballistic limits are shown for two variations of the austemper process. ADI targets reveal a capability for multiple impacts without structural failures. Penetration modes include ductile hole growth, radial fracture, petaling, and scabbing. V-50 velocities of ADI with lower values of hardness and strength are equal or greater than the V-50 velocities of ADI with higher values of hardness and strength. Graphite spheroids of this ductile cast iron appear to affect plastic deformation and penetration modes by localizing stresses, microstructural changes, and fracture.
Effect of Austenitizing Temperature and Time on the Fracture Toughness of Low Manganese Austempered Ductile Iron (ADI)
Author: Rachan Prabhakar RaoPublisher:
ISBN:
Category :
Languages : en
Pages : 152
Book Description
A Novel Two Step Austenitization Process to Produce Austempered Ductile Iron (ADI) with High Strength, Ductility and Fracture Toughness
Author: Deepak JoshiPublisher:
ISBN:
Category : Materials science
Languages : en
Pages : 0
Book Description
A novel, Two-Step Austenitizing heat treatment process for creation of Austempered Ductile Iron (ADI) with an optimum combination of strength, ductility and fracture toughness was conceived in this investigation. This novel heat treatment process involves heating the ductile iron in the lower intercritical temperature range and then raising the temperature to the fully austenitic temperature range followed by austempering in the bainitic temperature range. This heat treatment was expected to result in a microstructure consisting of proeutectoid ferrite, very fine scale bainitic ferrite, and high-carbon austenite. Tensile and CT test specimens were created and tested to evaluate the effects of several Two-Step Austenitizing heat treatment processes. The effect of the heat treatment parameters on the dislocation density of ADI was also studied. A simple, first-principles approach was taken to model the phase transformation kinetics associated with the phase transformations in the ADI alloy. The mechanical properties of a multiphase crystalline material such as ADI are hypothesized to be dictated by complex and interrelated effects involving microstructural features (such as the ferrite lathe size, retained austenite volume fraction, and carbon content of retained austenite) that are, in turn, strongly influenced by austenitization and austempering times and temperatures. This research study determined that, compared to conventionally processed ADI., one variant of the Two-Step Austenitizing heat treatment process yielded an ADI alloy with superior fracture toughness without significantly compromising the strength and ductility. It was concluded that prior nucleated proeutectoid ferrite was an important factor in this improvement. An analytical model based upon the nucleation of proeutectoid ferrite and graphite nodules during intercritical austenitization was created to explain this physical outcome.
Heavy Section Austempered Ductile Iron: Microstructural, Tensile and Fatigue Properties
Author: Gregory P. FaubertEffect of Austempering Variables on the Quasi-Static and Dynamic Fracture Toughness of Austempered Ductile Iron
Author: MN. SrinivasanPublisher:
ISBN:
Category : Austempering temperature
Languages : en
Pages : 6
Book Description
Statistical design of experiments was employed to study the effect of austenitizing temperature, austempering temperature, and austempering time on the quasi-static and dynamic fracture toughness of austempered ductile iron of a standard composition. Regression equations were developed to determine the relative significance of the variables in affecting the quasi-static and dynamic fracture toughness of the austempered iron studied.