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Detecting large inclusions in steels: evaluating methods
Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.ORCID-id: 0000-0001-6029-2613
2009 (Engelska)Ingår i: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 80, nr 11, s. 854-858Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The distributions of large non-metallic inclusions in two steel grades have been investigated using light optical microscopy, scanning electron microscopy and ultrasonic fatigue testing in the gigacycle range. The different methods have inherently different capabilities for finding inclusions in different size ranges. A measure of the distribution of large inclusions is proposed as the size S at which half of the fatigue specimens are expected to contain at least one inclusion of size S or larger, corresponding to 50% failure probability. Values of S are obtained using the volume distribution estimated by the three methods. Extrapolation from microscopy measurements on surfaces agree with fatigue fractography results regarding density of large inclusions, as measured by the proposed ranking variable S

Ort, förlag, år, upplaga, sidor
Wiley-VCH Verlagsgesellschaft, 2009. Vol. 80, nr 11, s. 854-858
Nationell ämneskategori
Materialteknik
Forskningsämne
Materialteknik
Identifikatorer
URN: urn:nbn:se:kau:diva-3517DOI: 10.2374/SRI09SP079OAI: oai:DiVA.org:kau-3517DiVA, id: diva2:158959
Anmärkning

Vid tidpunkten för författarens licentiatseminarium, förelåg detta delarbete som manuskript. This paper was first published as a manuscript at time for the author's licentiate seminar.

Tillgänglig från: 2009-02-05 Skapad: 2009-02-05 Senast uppdaterad: 2017-12-14Bibliografiskt granskad
Ingår i avhandling
1. Estimating inclusion content in high performance steels
Öppna denna publikation i ny flik eller fönster >>Estimating inclusion content in high performance steels
2008 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Non-metallic inclusions in steel pose a major problem for the fatigue resistance, especially regarding fatigue at very long lives corresponding to low cyclic stress levels, as well as being detrimental to material toughness and polishability.

The largest inclusions are quite rare, which makes conventional detection methods timeconsuming if reliable results are to be obtained. Based on surface scanning using light or electron microscopes, these methods provide results that have to be converted to reflect the statistical volume distribution of inclusions.

Very high cycle fatigue (in the order of 109 cycles or more) using ultrasonic fatigue at 20 kHz has been found efficient at finding the largest inclusions in volumes of about 300 mm3 per specimen. The inclusions found at the fatigue initiation site can then been used to estimate the distribution of large inclusions using extreme value statistics.

In this work, a new method for estimating the volume distribution of large inclusions is presented as well as a suggested ranking variable based on the volume distribution.

Results from fatigue fractography and area scanning methods are compared to the endurance limit at 109 cycles for a number of batches from two high performance steels.

In addition, the extreme value distributions of fatigue initiating inclusions in six high performace steels, produced by different routes, are presented. It is shown that all modes of the Generalized Extreme Values distribution can be found in different materials. This result shows that the assumption of mode I distribution, also known as Gumbel or Largest Extreme Value distribution, must be substantiated.

Ort, förlag, år, upplaga, sidor
Karlstad: Karlstad University, 2008. s. 18
Serie
Karlstad University Studies, ISSN 1403-8099 ; 2008:50
Nationell ämneskategori
Materialteknik
Forskningsämne
Materialteknik
Identifikatorer
urn:nbn:se:kau:diva-3520 (URN)978-91-7063-207-5 (ISBN)
Presentation
2008-12-19, Ljungbergssalen, 21A 244, Karlstads universitet, Karlstad, 13:15 (Svenska)
Opponent
Tillgänglig från: 2009-02-05 Skapad: 2009-02-05 Senast uppdaterad: 2011-11-29Bibliografiskt granskad
2. Large and rare: An extreme values approach to estimating the distribution of large defects in high-performance steels
Öppna denna publikation i ny flik eller fönster >>Large and rare: An extreme values approach to estimating the distribution of large defects in high-performance steels
2011 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The presence of different types of defects is an important reality for manufacturers and users of engineering materials. Generally, the defects are either considered to be the unwanted products of impurities in the raw materials or to have been introduced during the manufacturing process. In high-quality steel materials, such as tool steel, the defects are usually non-metallic inclusions such as oxides or sulfides.

Traditional methods for purity control during standard manufacturing practice are usually based on the light optical microscopy scanning of polished surfaces and some statistical evaluation of the results. Yet, as the steel manufacturing process has improved, large defects have become increasingly rare. A major disadvantage of the traditional quality control methods is that the accuracy decreases proportionally to the increased rarity of the largest defects unless large areas are examined.

However, the use of very high cycle fatigue to 109 cycles has been shown to be a powerful method to locate the largest defects in steel samples. The distribution of the located defects may then be modelled using extreme value statistics.

This work presents new methods for determining the volume distribution of large defects in high-quality steels, based on ultrasonic fatigue and the Generalized Extreme Value (GEV) distribution. The methods have been developed and verified by extensive experimental testing, including over 400 fatigue test specimens. Further, a method for reducing the distributions into one single ranking variable has been proposed, as well as a way to estimate an ideal endurance strength at different life lengths using the observed defects and endurance limits. The methods can not only be used to discriminate between different materials made by different process routes, but also to differentiate between different batches of the same material.

It is also shown that all modes of the GEV are to be found in different steel materials, thereby challenging a common assumption that the Gumbel distribution, a special case of the GEV, is the appropriate distribution choice when determining the distribution of defects.

The new methods have been compared to traditional quality control methods used in common practice (surface scanning using LOM/SEM and ultrasound C-scan), and suggest a greater number of large defects present in the steel than could otherwise be detected.

Ort, förlag, år, upplaga, sidor
Karlstad: Karlstad University, 2011. s. 31
Serie
Karlstad University Studies, ISSN 1403-8099 ; 2011:47
Nyckelord
Non-metallic inclusions, Tool steel, Extreme value statistics, Distribution of defects, Generalized extreme values
Nationell ämneskategori
Metallurgi och metalliska material
Forskningsämne
Materialteknik
Identifikatorer
urn:nbn:se:kau:diva-8226 (URN)978-91-7063-382-9 (ISBN)
Disputation
2011-10-27, Eva Eriksson, 21A 342, Karlstads universitet, Karlstad, 13:15 (Svenska)
Opponent
Handledare
Tillgänglig från: 2011-10-05 Skapad: 2011-09-12 Senast uppdaterad: 2011-10-25Bibliografiskt granskad

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