X-Ray Diffraction Observation of Fracture Surfaces of Ductile Cast Iron

1982 ◽  
Vol 26 ◽  
pp. 291-298 ◽  
Author(s):  
Zenjiro Yajima ◽  
Yukio Hirose ◽  
Keisuke Tanaka
Keyword(s):  
Fracture Toughness ◽  
Cast Iron ◽  
Compact Tension ◽  
Ductile Cast Iron ◽  
Line Broadening ◽  
X Ray Diffraction ◽  
X Ray ◽  
Three Point Bending ◽  
Fracture Surfaces ◽  
Machine Parts

X-ray diffraction observation of metal fractures provides fracture analysists with useful information on the mechanisms and mechanical conditions of fracturing. This method is called “X-ray fractography” and has been developed especially in Japan as a new engineering tool for fracture analysis.In the present paper, X-ray fractography is applied to fracture surfaces of ductile cast iron (JIS FCD 60) which are widely used as machine parts. The fracture toughness tests were conducted at ambient and low temperatures by using compact tension (CT) specimens with blunt notches and three-point bending (TPB) specimens with fatigue pre-cracks. The line broadening of X-ray diffraction profiles was measured on and beneath fracture surfaces of fracture toughness specimens.

X-Ray Study on the Fatigue Fracture Surface of Austempered Ductile Cast Iron

1991 ◽  
Vol 35 (A) ◽  
pp. 503-510 ◽  
Author(s):  
Yoichi Kishi ◽  
Yukio Hirose ◽  
Zenjiro Yajima ◽  
Keisuke Tanaka
Keyword(s):  
Cast Iron ◽  
Fatigue Fracture ◽  
Retained Austenite ◽  
Volume Fraction ◽  
Compact Tension ◽  
Ductile Cast Iron ◽  
Line Broadening ◽  
X Ray ◽  
Fracture Surfaces ◽  
Austempered Ductile Cast Iron

Austempered ductile cast iron (ADI) lias microstructures that consist of martensite and of retained austenite. ADI has very toughness compared with cast iron heat-treated differently. The retained austenite near fracture surfaces transforms to martensite when fracture occurs.In the present study, X-ray fraetography is applied to fatigue fracture surfaces of ADI. The fatigue tests were carried out on compact tension (CT) specimens. The volume fraction of retained austenite was measured quantitatively and the line broadening of X-ray diffraction profiles was measured on and beneath fatigue fracture surfaces. The depth of the plastic zone left on fracture surfaces was evaluated from line broadening. The results are discussed on the basis of fracture mechanics.

X-ray Fractography on Fatigue Fractured Surface of Austenitic Stainless Steel

1994 ◽  
Vol 38 ◽  
pp. 443-453
Author(s):  
Zenjiro Yajima ◽  
Hideki Tokuyama ◽  
Yasuo Kibayashi ◽  
Yukio Hirose
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Fatigue Fracture ◽  
Solution Treatment ◽  
Compact Tension ◽  
Fatigue Tests ◽  
Line Broadening ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fracture Surfaces

X-ray diffraction observation of the material internal structure beneath fracture surfaces provide fracture analysis with useful information to investigate the conditions and mechanisms of fracture. X-ray fractography is a generic name given to this technique. In the present study, X-ray fractography was applied to fatigue fracture surfaces of austenitic stainless steel (AISI 304) which consisted of solution treatment. The fatigue tests were carried out on compact tension (CT) specimens. The plastic strain on the fracture surface was estimated from measuring the line broadening of X-ray diffraction profiles. The line broadening of X-ray diffraction profiles was measured on and beneath fatigue fracture surfaces. The depth of the plastic zone left on fracture surfaces was evaluated from the line broadening. The results are discussed on the basis of fracture mechanics.

X-Ray Diffraction Study of Fracture Surface Made by Fracture Toughness Tests of Blunt Notched CT Specimen of Aluminum Alloy

1986 ◽  
Vol 30 ◽  
pp. 537-544 ◽  
Author(s):  
Akira Suzuki ◽  
Akira Tanji ◽  
Zenjiro Yajima ◽  
Yukio Hirose ◽  
Keisuke Tanaka
Keyword(s):  
Fracture Toughness ◽  
Aluminum Alloy ◽  
Fracture Surface ◽  
Diffraction Method ◽  
High Strength ◽  
Compact Tension ◽  
X Ray Diffraction ◽  
Notch Radius ◽  
X Ray ◽  
Fracture Surfaces

X-ray fractography is a new method utilizing the X-ray diffraction technique to observe the fracture surface for the analysis of the micro-mechanisms and mechanics of fracture.In the present paper, X-ray fractography is applied to fracture surfaces of high strength aluminum alloy (JIS 7075-T6). The fracture toughness tests were conducted by using compact tension (CT) specimens with blunt notches and fatigue pre-cracks. The distribution of the residual stress near fracture surfaces was measured by the X-ray diffraction method. The effect of the notch radius on the fracture toughness value was discussed.

X-Ray Residual Stress Measurement on Stress Corrosion Fracture Surfaces

1992 ◽  
Vol 36 ◽  
pp. 543-549
Author(s):  
Masaaki Tsuda ◽  
Yukio Hirose ◽  
Zenjiro Yajima ◽  
Keisuke Tanaka
Keyword(s):  
Fracture Toughness ◽  
Residual Stress ◽  
Fracture Surface ◽  
Stress Corrosion ◽  
Stress Measurement ◽  
High Strength Steels ◽  
High Strength ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fracture Surfaces

X-ray fractography is a new method utilizing the X-ray diffraction technique to observe the fracture surface for the analysis of the micromechanisms and mechanics of fracture. X-ray residual stress has been confirmed to be a particularly useful parameter when studying the fracture surfaces of high strength steels. The method has been applied to the fracture surface of fracture toughness and fatigue specimens.

X-Ray Fractographic Study on Fatigue Fracture Surface of Ductile Cast Iron

1993 ◽  
Vol 37 ◽  
pp. 327-334
Author(s):  
Akira Suzuki ◽  
Yoichi Kishi ◽  
Zenjiro Yajima ◽  
Yukio Hirose
Keyword(s):  
Cast Iron ◽  
Fracture Surface ◽  
Fatigue Fracture ◽  
Retained Austenite ◽  
Volume Fraction ◽  
Compact Tension ◽  
Fatigue Tests ◽  
Ductile Cast Iron ◽  
Fatigue Fracture Surface ◽  
X Ray

Austempered ductile cast iron (ADI) has composite microstructures, which are martensite/retained austenite structures. ADI has very large toughness compared to other ductile cast irons. After fracture, the retained austenite near the fracture surface will be transformed to martensite. In the present study, X-ray fractography is applied to fatigue fracture surface of ADI. The fatigue tests were carried out on compact tension (CT) specimens. The volume fraction of retained austenite was quantitatively measured on and beneath fatigue fracture surfaces. The plastic strain on the fracture surface was estimated from measuring the line broadening of X-ray diffraction profiles. The depth of the plastic zone left on fracture surface was evaluated from the distributions of the volume fraction of retained austenite. The results are discussed on the basis of fracture mechanics.

The Effects of Austempering Temperature and Time on Mechanical Properties of Ductile Cast Iron Grade FCD450

2020 ◽  
Vol 856 ◽  
pp. 92-98
Author(s):  
Janthira Chantarach ◽  
Rungsinee Canyook
Keyword(s):  
Mechanical Properties ◽  
Cast Iron ◽  
Low Temperature ◽  
Impact Toughness ◽  
Ductile Cast Iron ◽  
X Ray Diffraction ◽  
X Ray ◽  
Different Temperatures ◽  
Austempering Temperature ◽  
Iron Grade

The purpose of the study was to inspect microstructure, mechanical properties and impact toughness of ductile cast iron grade FCD450 produced by austempering process. The study focused on austempering parameter, which effected impact toughness of material at low temperature. The FCD450 was initially temperature austenized at 885°C (1625˚F) for 2 hours. Austempering was carried out at three different temperatures of 271°C (520˚F), 313°C (560˚F) and 357°C (675˚F). The austempering temperature were varied at 1.5, 2.5 and 3.5 hours. X-ray diffraction was showed that the austempered ductile cast iron (ADI) microstructure consists of austenite and ferrite. The results showed that when austempered at 357°C (675˚F) for 2.5 hours has highest hardness and impact energy at low temperature. The dimple ductile fracture of ADI fracture surfaces was revealed by scanning electron microscope (SEM).

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