Craze Cracking In Steel Castings

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Resulfurized Billet Round Cracks - Dresseltech

Resulfurized Billet Round Cracks Question In as cast rounds of 220 mm diameter we are facing sub-surface cracks in medium carbon resulphurised steel grades i.e. with Sulphur up to 0.035 %. The crack is located 10 to 15 mm below the surface. Casting speed range is 1.1. to 1.2 m/min. What needs to be done to overcome the crack problem. Please advise.

SCC - Stress Corrosion Cracking of Stainless Steel

embrittlement of carbon steel un- der stress from welding or cold- forming. The term caustic embrittlement is a misnomer be- cause the phenomenon is simply SCC of steel in the alkaline solution. The 1 mpy (0.0254 mm/y) isocorrosion line in Figure 1 is nearly constant at 100°C (212°F) from …

CRAZING OR CRAZE CRACKING - Manatts

CRAZING OR CRAZE CRACKING Crazing, sometimes referred to as “map cracking”, is a pattern of random fine cracks that occur at the surface of concrete at an early age when the unhardened surface mortar dries out faster than the concrete below. This drying at the surface causes the concrete at the surface to shrink at a faster rate

Quench Cracking - Industrial Heating

Mar 28, 2012· Improper steel selection: Selecting a steel with too high a hardenability can result in susceptibility to quench cracks and excessive core hardness. Improper part design: Sharp changes of section, lack of radii, holes, sharp keyways and unbalanced sectional mass create stress risers in locations where cracking is likely to occur.

Can Crack-Free Concrete Floors Be Built on Steel Decks ...

Dec 01, 1973· An owner's representative recently disapproved of cracks in concrete floors on steel decks and asked the contractor to correct them. The floors had been cast on a permeated corrugated steel deck supported by a structural steel frame. The contractor inquired of CONCRETE CONSTRUCTION whether there is a known way to prevent such cracking and a way ...

Technical Guidance - ACIFCACIFC

Cracks in Industrial Concrete Floors This Flooring Technical Note considers the types of cracks specific to concrete industrial floors and the typical causes of non-structural cracks. It does not look at the subject of crazing which is covered separately in Flooring Technical Note 03 – Surface Crazing.

Surface crazing or cracking on brake discs

The picture above shows a normal cast iron brake disc that exhibits what we call crazing. These are tiny hairline cracks that are extremely small and not of real concern. These are microns deep and are exaggerated by the black brake dust generated under normal driving.

Another casting failure - Metal and Metallurgy engineering ...

ASTM A27 / A27M - 13(2016) Standard Specification for Steel Castings, Carbon, for General Application ASTM A781 / A781M - 16 Standard Specification for Castings, Steel and Alloy, Common Requirements, for General Industrial Use ... I would NOT be surprised to see surface crazing/cracks all-around the land around the saddle where the fracture ...

Stress corrosion cracking - Wikipedia

Stress corrosion cracking (SCC) is the growth of crack formation in a corrosive environment. It can lead to unexpected and sudden failure of normally ductile metal alloys subjected to a tensile stress, especially at elevated temperature.SCC is highly chemically specific in that certain alloys are likely to undergo SCC only when exposed to a small number of chemical environments.

Macro Defects in Steel - Surface Defects

Craze cracking - Casting defects Crazing - Anodizing defects catalogue - Coating defects Crazing - Coating defects Crazing - Hot rolled flat steel products - Rolling defects Crazing - Ingot defects Create an additional earthing - Powder coating - Coating defects Creep accompanied by scoring of bore surface - Bearing defects

Typical defects in plate and long steel products | Emerald ...

Oct 03, 2016· Findings. In general, the most commonly encountered defects from semi-finished (billets, blooms, and slabs) and final (round bar and plate) steel products are as follows: network cracks, porosity, gas holes, shrinkage, shell, slivers, casting powder entrapment, ladle slag entrapment, other non-metallic inclusions, low hot ductility, centerline segregation cracking, macro- and micro …

Defects - Solidification Cracking - TWI

A fully austenitic stainless steel weld is more prone to cracking than one containing between 5-10% of ferrite. The beneficial effect of ferrite has been attributed to its capacity to contain harmful impurities within the grains which would otherwise form low melting point segregates and consequently interdendritic cracks. Therefore the choice ...

What is a Crazing? - Definition from Corrosionpedia

Oct 15, 2014· Crazing refers to a network of visual cracks on a coated metallic surface. It occurs due to tension stresses in some glassy thermoplastic polymers. Crazing is propagated in metallic surface regions that experience high tension and leads to the formation of microvoids and small cracks.

Chapter Two - Types and Causes of Concrete Cracking in ...

The major types are transverse, longitu- dinal, diagonal, and random. Transverse cracks are illustrated in Figure 1. In addition, there is map cracking, which is also called pattern cracking or crazing. In hardened concrete, cracks form where the tensile stress in …

US20020062941A1 - Apparatus and method for die casting ...

The present invention provides a method and apparatus for die-casting copper and other metals that are cost-effective and practical for production use in die-casting, for example, copper motor rotors. In motor rotors, the incorporation of die-cast copper for conductor bars and end rings in place of aluminum is known to result in improvements in motor energy efficiency.

A study of hot shortness in steels

molten steel had been accepted for some time but sulfides were believed to be insoluble in solid steel. Solid solu-6 . bility required proof. The solubility of sulfides and other materials in liquid steels was believed by Sims and Lillieqvist (6)~ ...

NUMERICAL MODELS AND THEIR VALIDITY IN THE …

There are two modes of cracking in die casting: Craze Cracking or Heat Checks Heat checks are normally seen at flat die surface, which do not have any stress concentration. Figure 4 shows an example of such cracking. The direction of cracking depends on which component of strain is dominant. At the center, the strain in both directions is same ...

Thermal-fatigue of type 304 stainless steel

many thousands of thermal cycles before cracking develops, or on the other hand, cracks may initiate after the first few cycles if the conditions are severe. This form of cracking is known as thermal fatigue, craze-cracking, heat-checking and network or mosaic cracking(l) * • …

Cause of Cracks in H-13 Aluminum Die Casting Molds - CR4 ...

May 01, 2013· This creates a thermal gradient in the mold body and a differential expansion of the steel. If this stress exceeds the elastic limit of the steel, the steel will fail brittlely and micro cracks will develop and rapidly grow. H-13 die casting molds are normally run at 400 - 500 deg. F.

The Cracking Mechanism of Ferritic- Austenitic Cast Steel

The low-carbon and low-alloy cast steel casting hot cracking cause are type II sulphide, in high carbon tool cast steel secondary cementite mesh and / or ledeburite segregated at the grain solidified grains boundaries, in the case of Hadfield steel phosphorus - carbide eutectic, which carrier is iron-manganese and low solubility of phosphorus in high manganese matrix.

The Role of Grain Boundary Oxidation on Surface Crack ...

This paper represents an extended abstract of a study presented at the ESTAD 2019 conference. In this contribution, the influence of different cooling strategies on the formation of intergranular surface cracks is observed with in-situ bending experiments under continuous casting conditions. The steel composition is equal to a 0.17 wt.% C construction steel.

Macro Defects in Steel - Casting Defects

Porosity - Casting defects in the block window II - Casting defects Porosity in AISI 8630 cast steel - Casting defects Porosity shrinkage defect - Casting defects Poured short - Casting defects Primary chill - Casting defects Push-up, clamp-off - Casting defects Quench cracking - Casting defects Quench cracks - Casting defects

US4352390A - Precision silica cones for sand casting of ...

Partially devitrified silica cores with exceptional high temperature strength are disclosed for foundry use in sand casting of ferrous alloys. Precision cored holes of small size and long length, which heretofore could not be cast accurately or had to be machined because of limitations in existing core technology, are formed using accurately machined extruded porous silica cores fired to ...

Atlas of Casting Defects - Investment Casting Institute

Defect: Rat-Tailing/Oxidation Crazing Appearance of Defect: Shallow rounded grooves on the surface of the casting with radial pattern (oxide may be evident in the grooves prior to cleaning). Probable Cause 1. High shell temperature and excessive time during preheat. 2. Shell cracking …

What is Crazing, Why Does it Happen and How to Prevent It?

Glaze crazing or glaze crackle is a network of lines or cracks in the fired glazed surface. It happens when a glaze is under tension. A craze pattern can develop immediately after removal from the kiln or years later. We (Lakeside Pottery) know of cases where the "pinging" sounds of newly developed crazing lines go for many years.

Cracking in Plastic Concrete - Precast Concrete

May 29, 2010· Cracks are typically straight and located above reinforcing steel with minimal concrete cover. Hairline plastic shrinkage cracks in the surface of architectural concrete are often referred to as crazing. These cracks are visible to the unaided eye, but are not measurable by ordinary means.

Continuous Casting of Microalloyed Steels. Influence of ...

Corner cracking in medium C electric arc steel was experienced after continuous casting of square billets. This led to the investigation of the influence of high N levels on hot ductility.

(PDF) Tool Failure in Die Casting - ResearchGate

Soldering in die casting: Aluminum alloy and die steel interactions. Die Casting Engineer 44, 70 ... The craze-cracking of metals. The Journal of the Iron and Steel Institute. 385 ...

7 Causes of Quench Cracking in Steel | Production Machining

Porosity - Casting defects in the block window II - Casting defects Porosity in AISI 8630 cast steel - Casting defects Porosity shrinkage defect - Casting defects Poured short - Casting defects Primary chill - Casting defects Push-up, clamp-off - Casting defects Quench cracking - Casting defects Quench cracks - Casting defects

Thermal cracking behavior of multi-layer LAFAD coatings on ...

Jan 15, 2002· This cracking is due to the large thermal shock experienced by the die steel when it is quenched by cold water after a die casting cycle. The propagation of cracks depends on the severity of the thermal fatigue cycle (peak and range), that is caused by die surface being in contact alternatively with the liquid melt at 700°C and cold water at ...