EP3234580A1 - Method for non-destructively determining material properties - Google Patents

Method for non-destructively determining material properties

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Publication number
EP3234580A1
EP3234580A1 EP15798419.6A EP15798419A EP3234580A1 EP 3234580 A1 EP3234580 A1 EP 3234580A1 EP 15798419 A EP15798419 A EP 15798419A EP 3234580 A1 EP3234580 A1 EP 3234580A1
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EP
European Patent Office
Prior art keywords
cast
alloy
sample
crash
measurement
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
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EP15798419.6A
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German (de)
French (fr)
Inventor
Alexander AIGNER
Manuel Anasenzl
Franz-Josef Klinkenberg
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP3234580A1 publication Critical patent/EP3234580A1/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/20—Metals
    • G01N33/204—Structure thereof, e.g. crystal structure
    • G01N33/2045—Defects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
    • G01N27/9046—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents by analysing electrical signals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
    • G01M5/0091—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by using electromagnetic excitation or detection
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents

Definitions

  • the invention relates to a method for non-destructive determination of material characteristics of electrically conductive components by means of electromagnetic eddy current testing.
  • crash tests In the automotive industry, light metals are increasingly being used to save weight.
  • the structural components used in this case are regularly produced as aluminum castings. It is desirable to be able to easily and quickly assess these for their ductility / molding properties. So far, crash tests, bending angle tests, ductility testing by means of punch rivet tests and drop tower tests for test bodies have been used. All of these test methods have considerable disadvantages. Thus, the crash test is a destructive, extremely costly and time-consuming test method with often difficult statements and conclusions. The bending angle measurement is also destructive and does not allow a real examination of the material properties.
  • the eddy current test As a non-destructive testing method for determining mechanical material properties of electrically conductive materials, the eddy current test is known. Here, the effect is used that most impurities and damage in an electrically conductive material also have a different electrical conductivity or a different permeability than the actual material.
  • the object of the present invention is to replace the known destructive test methods in structural components made of cast iron.
  • the term sample does not only mean cast samples, but also finished cast components, in particular structural components for vehicle construction.
  • the development according to claim 3 increases the comparability of the measurement results.
  • the method according to the invention can be used particularly advantageously for structural components, such as side members in motor vehicles, of an AISiMg alloy.
  • Fig. 2 is a measurement display of a first alloy composition
  • Fig. 3 is a measurement display of a second alloy composition.
  • FIG. 1 shows a measurement display of a reference measurement on a measurement screen.
  • This cast sample is subjected to the eddy current test in a manner known per se, the measuring sensor used being a high-resolution measuring coil tuned to the cast-specific conductivity.
  • This measuring coil is moved with a variable distance, tilting back and forth over the casting sample, so that there is a changing magnetic field.
  • the measured values generated in this way are clustered piles of dots which, as shown in FIG. 1, form a straight line 1 rising from left to right. This forms the reference straight line for the subsequent measurements.
  • the gain of the measured values of the reference straight line 1 is set so that the straight line passes through the center 2 of the crosshairs of the display in FIG.
  • Point clusters are again generated which form a straight line 3 and 4 in FIG. 2.
  • it is a heat-treated alloy consisting of 0.2% by weight AISM OMnMg, with the cast sample on the basis of the measuring line 3 having a lower test temperature than that of the measuring line 4.
  • the casting sample producing the measuring line 3 had the same test temperature as the reference sample. from that It can be seen that the cast sample from this AISil OMn alloy with 0.2 wt.% Mg has a better crash behavior than the reference sample.
  • the result is the measuring straight line 4. From this, one could conclude that the ductility in the event of a crash has deteriorated compared with the sample generating the straight line 3, but this is actually due solely to the different test temperature of one and the same cast sample.
  • FIG. 3 two more measuring lines 5 and 6 are shown. These are one cast sample each of a heat treated AISM OMn alloy containing 0.4 wt% Mg, with the casting sample that gave the measurement line 5 the same test temperature as the reference sample and the casting sample assigned to measurement line 3. From this it can be seen that the casting sample according to the measuring line 5 shows almost the same crash behavior as the reference sample, but a deteriorated behavior compared to the cast sample of the AISiMg alloy with 0.2 wt .-% Mg.
  • An increased test temperature corresponding to the measuring line 6 does not change the material result, but rather the temperature-dependent measurement result in the direction of a deteriorated crash behavior.

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Electromagnetism (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

The aim of the invention is to determine the crash dynamic behavior of structural castings made of a AlSi10MnMg alloy in a simple and cost-effective manner. In order to achieve said aim, it is proposed according to the invention that an eddy current testing is carried out using a high-resolution measuring coil which is adjusted to the cast-specific conductivity.

Description

Verfahren zum zerstörungsfreien Ermitteln von Werkstoffkennwerten  Method for the non-destructive determination of material characteristics
Die Erfindung bezieht sich auf ein Verfahren zum zerstörungsfreien Ermitteln von Werkstoffkennwerten von elektrisch leitenden Bauteilen mittels elektromagnetischer Wirbelstromprüfung. The invention relates to a method for non-destructive determination of material characteristics of electrically conductive components by means of electromagnetic eddy current testing.
Im Fahrzeugbau werden zunehmend Leichtmetalle eingesetzt, um Gewicht zu sparen. Die hierbei verwendeten Strukturbauteile werden regelmäßig als Aluminiumgussteile hergestellt. Wünschenswert ist es, diese einfach und schnell bezüglich ihrer Duktilitäts- Λ/erformungseigenschaften beurteilen zu können. Bisher verwendete man hierzu Crashtests, Biegewinkeltests, Duktilitätsprüfung mittels Stanzniettests und Fallturmtests für Versuchskörper. Alle diese Testverfahren haben erhebliche Nachteile. So ist der Crashtest ein zerstörendes, extrem kosten- und zeitintensives Prüfverfahren mit oft schwierigen Aussagen und Schlussfolgerungen. Die Biegewinkelmessung ist ebenfalls zerstörend und erlaubt keine wirkliche Prüfung der Werkstoffeigenschaften. In the automotive industry, light metals are increasingly being used to save weight. The structural components used in this case are regularly produced as aluminum castings. It is desirable to be able to easily and quickly assess these for their ductility / molding properties. So far, crash tests, bending angle tests, ductility testing by means of punch rivet tests and drop tower tests for test bodies have been used. All of these test methods have considerable disadvantages. Thus, the crash test is a destructive, extremely costly and time-consuming test method with often difficult statements and conclusions. The bending angle measurement is also destructive and does not allow a real examination of the material properties.
Als zerstörungsfreies Prüfverfahren zur Ermittlung von mechanischen Werkstoffeigenschaften von elektrisch leitenden Materialien ist die Wirbelstromprüfung bekannt. Hierbei wird der Effekt genutzt, dass die meisten Verunreinigungen und Beschädigungen in einem elektrisch leitfähigen Material auch eine andere elektrische Leitfähigkeit oder eine andere Permeabilität als das eigentliche Material haben. As a non-destructive testing method for determining mechanical material properties of electrically conductive materials, the eddy current test is known. Here, the effect is used that most impurities and damage in an electrically conductive material also have a different electrical conductivity or a different permeability than the actual material.
So wird beispielsweise in der Dissertation von Mock„Qualitätsbewertung und Thus, for example, in the dissertation of Mock "quality assessment and
-regelung für die Fertigung von Karosserieteilen in Presswerken auf Basis neuronaler Netze" vom 30 05.201 1 , erschienen im Herbert Utz Verlag, München, Forschungsberichte IWB, Band 251 , auf den Seiten 19 bis 21 das Wirbelstromprinzip bei der zerstörungsfreien Ermittlung mechanischer Werkstoffkennwerte beschrieben. Hierzu zählen Zugfestigkeit, Streckgrenze, Dehnung und andere. Elektrisch leitende Materialien können durch Anlegen eines zeitlich sich ändernden magnetischen Feldes berührungslos und innerhalb kürzester Zeit vermessen werden. Sowohl mechanische als auch elektrische Eigenschaften hängen vom Werkstoffzustand und damit vom Gefüge, Legierungsbestandteilen, der Korngröße, der Versetzungsdichte, der Anisotropie usw. ab. Damit existiert ein Korrelationsverhalten zwischen elektromagnetischen und mechanischen Eigenschaften eines Werkstoffs. In dieser Dissertation wird das Wirbelstromprüfverfahren zum Ermitteln von mechanischen, sprich statischen Werkstoff ken n we rte n , im Presswerk bei der Herstellung von Karosseriebauteilen beschrieben, um Produktionsfehler möglichst vollautomatisch und rechtzeitig zu erkennen. Regulation for the manufacture of body parts in pressing plants based on neural networks "from 30 05.201 1, published by Herbert Utz Verlag, Munich, IWB research reports, Volume 251, described on pages 19 to 21, the eddy current principle in the non-destructive determination of mechanical material properties Tensile strength, yield strength, elongation, etc. Electrically conductive materials can be measured contactlessly and within a very short time by applying a time-varying magnetic field Both mechanical and electrical properties depend on the material condition and thus on the microstructure, alloy components, grain size, dislocation density , anisotropy, etc. Thus, a correlation behavior exists between electromagnetic and mechanical properties of a material. In this dissertation, the eddy current test method for determining mechanical, ie static, material properties is described in the press shop in the manufacture of body components, in order to detect production errors as fully automatically as possible in good time.
Aufgabe der vorliegenden Erfindung ist es, die bekannten zerstörenden Prüfverfahren bei Strukturbauteilen aus Guss zu ersetzen. The object of the present invention is to replace the known destructive test methods in structural components made of cast iron.
Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst. Die Unteransprüche beschreiben vorteilhafte Weiterbildungen der Erfindung. This object is solved by the features of patent claim 1. The subclaims describe advantageous developments of the invention.
Es hat sich überraschender Weise herausgestellt, dass sich mit der Wirbelstromprüfung neben den bekannten statischen Werkstoffkennwerten auch das stoßdynamische Verformungsverhalten von Gussproben, insbesondere ihr Verhalten im Crashfall, sicher und zuverlässig ermitteln lässt, wenn man einen auf die gussspezifische Leitfähigkeit angepass- ten, hochauflösende Wirbelstromsensor verwendet. Damit steht ein kostengünstiges, schnelles und reproduzierbares Messverfahren mit objektiven Crash-Bewertungskriterien für Gussteile zur Verfügung. Unter dem Begriff Probe im Sinne dieser Erfindung werden nicht nur Gussproben verstanden, sondern auch fertig gegossene Bauteile, insbesondere Strukturbauteile für den Fahrzeugbau. It has surprisingly been found that with the eddy current test in addition to the known static material parameters and the shock-dynamic deformation behavior of cast samples, especially their behavior in the event of a crash, can be determined safely and reliably, if one adapted to the cast-specific conductivity, high-resolution eddy current sensor , This provides a cost-effective, fast and reproducible measuring method with objective crash evaluation criteria for castings. For the purposes of this invention, the term sample does not only mean cast samples, but also finished cast components, in particular structural components for vehicle construction.
Um schnell objektive und verlässliche Aussagen über das Crashverhalten der Proben zu erhalten, hat sich die Vorgehensweise nach Patentanspruch 2 als sinnvoll erwiesen. In order to quickly obtain objective and reliable information about the crash behavior of the samples, the procedure according to claim 2 has proven to be useful.
Die Weiterbildung nach Patentanspruch 3 erhöht die Vergleichbarkeit der Messergebnisse. The development according to claim 3 increases the comparability of the measurement results.
Besonders vorteilhaft lässt sich das erfindungsgemäße Verfahren bei Strukturbauteilen, wie Längsträger in Kraftfahrzeugen, aus einer AISiMg Legierung anwenden. The method according to the invention can be used particularly advantageously for structural components, such as side members in motor vehicles, of an AISiMg alloy.
Im Folgenden wird die Erfindung an Hand eines schematisierten Beispiels näher erläutert. Es zeigen: Fig. 1 eine Messanzeige einer Referenzmessung; The invention will be explained in more detail below with reference to a schematic example. Show it: 1 shows a measurement display of a reference measurement;
Fig. 2 eine Messanzeige einer ersten Legierungszusammensetzung; und Fig. 2 is a measurement display of a first alloy composition; and
Fig. 3 eine Messanzeige einer zweiten Legierungszusammensetzung. Fig. 3 is a measurement display of a second alloy composition.
In Fig. 1 ist eine Messanzeige einer Referenzmessung auf einem Messbildschirm dargestellt. Hierzu verwendet man eine Gussprobe einer Legierung, deren Crashverhalten durch andere Prüfverfahren, beispielsweise durch ein Verfahren der eingangs zum Stand der Technik genannten Art, bekannt ist. FIG. 1 shows a measurement display of a reference measurement on a measurement screen. For this purpose, a cast sample of an alloy whose crash behavior is known by other test methods, for example by a method of the type mentioned at the beginning of the prior art, is used.
Diese Gussprobe wird in an sich bekannter Weise der Wirbelstromprüfung unterzogen, wobei der verwendete Messsensor eine auf die gussspezifische Leitfähigkeit abgestimmte, hochauflösende Messspule ist.  This cast sample is subjected to the eddy current test in a manner known per se, the measuring sensor used being a high-resolution measuring coil tuned to the cast-specific conductivity.
Diese Messspule wird mit einem variablen Abstand, hin und her kippend über die Gussprobe bewegt, damit sich ein sich änderndes Magnetfeld ergibt. Die so erzeugten Messwerte sind aneinander gereihte Punkthaufen, die, wie Fig. 1 zeigt, eine von links nach rechts ansteigende Messgerade 1 bilden. Diese bildet für die nachfolgenden Messungen die Referenzgerade. This measuring coil is moved with a variable distance, tilting back and forth over the casting sample, so that there is a changing magnetic field. The measured values generated in this way are clustered piles of dots which, as shown in FIG. 1, form a straight line 1 rising from left to right. This forms the reference straight line for the subsequent measurements.
Die Verstärkung der Messwerte der Referenzgeraden 1 wird so eingestellt, dass die Messgerade durch die Mitte 2 des Fadenkreuzes der Anzeige in Fig 1 verläuft. The gain of the measured values of the reference straight line 1 is set so that the straight line passes through the center 2 of the crosshairs of the display in FIG.
Anschließend wird eine neue Gussprobe mit einem unbekannten Crashverhalten der Wirbelstromprüfung unterzogen, wobei die Verstärkung der Messwerte, die bei der Referenzmessung angewandt wurde, beibehalten wird. Subsequently, a new cast sample with an unknown crash behavior is subjected to the eddy current test, whereby the gain of the measured values, which was used in the reference measurement, is maintained.
Es werden wieder Punkthaufen erzeugt, die eine Messgerade 3 und 4 in Fig. 2 bilden. In beiden Fällen handelt es sich um eine wärmebehandelte, aus AISM OMnMg mit 0,2 Gew.- % bestehende Legierung, wobei die der Messgeraden 3 zugrunde liegende Gussprobe eine niedrigere Prüftemperatur aufwies als die der Messgeraden 4. Die die Messgeraden 3 erzeugende Gussprobe hatte die gleichen Prüftemperatur wie die Referenzprobe. Daraus ist ersichtlich, dass die Gussprobe aus dieser AISil OMn- Legierung mit 0,2 Gew.-% Mg ein besseres Crashverhalten aufweist als die Referenzprobe. Point clusters are again generated which form a straight line 3 and 4 in FIG. 2. In both cases it is a heat-treated alloy consisting of 0.2% by weight AISM OMnMg, with the cast sample on the basis of the measuring line 3 having a lower test temperature than that of the measuring line 4. The casting sample producing the measuring line 3 had the same test temperature as the reference sample. from that It can be seen that the cast sample from this AISil OMn alloy with 0.2 wt.% Mg has a better crash behavior than the reference sample.
Wird eine erhöhte Prüftemperatur gewählt, so ergibt sich die Messgerade 4. Daraus könnte man auf eine verschlechterte Duktilität im Crashfall gegenüber der die Messgerade 3 erzeugenden Probe schließen, was aber tatsächlich einzig und allein auf die unterschiedliche Prüftemperatur ein und derselben Gussprobe zurückzuführen ist. If an increased test temperature is selected, the result is the measuring straight line 4. From this, one could conclude that the ductility in the event of a crash has deteriorated compared with the sample generating the straight line 3, but this is actually due solely to the different test temperature of one and the same cast sample.
In Fig. 3 sind zwei weitere Messgeraden 5 und 6 dargestellt. Hierbei handelt es sich um jeweils eine Gussprobe aus einer wärmebehandelten AISM OMn-Legierung mit 0,4 Gew - % Mg, wobei die Gussprobe, die die Messgerade 5 ergab, die gleiche Prüftemperatur aufwies wie die Referenzprobe sowie die der Messgeraden 3 zugeordnete Gussprobe. Hieraus sieht man, dass die Gussprobe gemäß der Messgeraden 5 nahezu das gleiche Crashverhalten zeigt wie die Referenzprobe, aber ein verschlechtertes Verhalten gegenüber der Gussprobe aus der AISiMg Legierung mit 0,2 Gew.-% Mg. In Fig. 3, two more measuring lines 5 and 6 are shown. These are one cast sample each of a heat treated AISM OMn alloy containing 0.4 wt% Mg, with the casting sample that gave the measurement line 5 the same test temperature as the reference sample and the casting sample assigned to measurement line 3. From this it can be seen that the casting sample according to the measuring line 5 shows almost the same crash behavior as the reference sample, but a deteriorated behavior compared to the cast sample of the AISiMg alloy with 0.2 wt .-% Mg.
Eine erhöhte Prüftemperatur entsprechend der Messgeraden 6 verändert wiederum nicht material-, sondern rein temperaturbedingt das Messergebnis in Richtung eines verschlechterten Crashverhaltens. An increased test temperature corresponding to the measuring line 6, in turn, does not change the material result, but rather the temperature-dependent measurement result in the direction of a deteriorated crash behavior.
Bei den Gussproben ist es unerheblich, ob es sich um Proben aus der Schmelze handelt oder um bereits fertig gegossene Bauteile. For casting samples, it does not matter whether they are samples from the melt or already cast components.
Klassische Zugversuche an den gleichen Gussproben zeigten keinerlei unterschiedliche Ergebnisse, gleichgültig, wie hoch oder niedrig die Probentemperatur lag. Hierbei kann also nicht auf ein crashdynamisches Verhalten geschlossen werden bzw. es werden die falschen Schlussfolgerungen aus derartigen Ergebnissen gezogen. Classical tensile tests on the same cast samples did not show any different results, no matter how high or low the sample temperature was. This can not be concluded on a crash-dynamic behavior or it will draw the wrong conclusions from such results.

Claims

Patentansprüche claims
1. Verfahren zum zerstörungsfreien Ermitteln von Werkstoffkennwerten von elektrisch leitenden Bauteilen mittels elektromagnetischer Wirbelstromprüfung, dadurch gekennzeichnet, dass 1. A method for non-destructive determination of material characteristics of electrically conductive components by means of electromagnetic eddy current testing, characterized in that
zur Ermittlung des stoß- und/oder crashdynamischen Verformungsvermögens einer Gussprobe eine an die gussspezifische Leitfähigkeit angepasste, hochauflösende Wirbelstrommessung verwendet wird.  a high-resolution eddy-current measurement adapted to the cast-specific conductivity is used to determine the impact and / or crash dynamics of a cast sample.
2. Verfahren nach Patentanspruch 1 , dadurch gekennzeichnet, dass 2. The method according to claim 1, characterized in that
zuerst eine Gussprobe bekannten stoß- und/oder crashdynamischen Verformungsvermögens als Referenzprobe gemessen, deren Messsignal aufgezeichnet und die Verstärkung des Messsignals so gewählt wird, dass die Referenzkurve in der Mitte des Messfeldes liegt und dass die Messkurven der zu untersuchenden Gussproben an Hand ihrer Lage in diesem Messfeld beurteilt werden.  First, a casting sample known impact and / or crash dynamic deformation capacity as a reference sample recorded their measurement signal recorded and the gain of the measurement signal is chosen so that the reference curve is in the middle of the measurement field and that the curves of the cast samples to be examined based on their position in this Measuring field are judged.
3. Verfahren nach Patentanspruch 1 oder 2, dadurch gekennzeichnet, dass 3. The method according to claim 1 or 2, characterized in that
zur Ermittlung des stoß- und/oder crashdynamischen Verformungsvermögens die zu messenden Gussproben die gleiche Prüftemperatur aufweisen.  to determine the impact and / or crash dynamic deformation capacity, the casting samples to be measured have the same test temperature.
4. Verwendung des Verfahrens nach einem der vorhergehenden Patentansprüche bei Strukturbauteilen in Kraftfahrzeugen aus einer AISil OMnMg Legierung, wobei der Magnesiumgehalt zwischen 0,05 und 0,60 Gew.-%, vorzugsweise zwischen 0,14 und 0,45 und insbesondere zwischen 0,14 und 0,30 Gew.-% liegt. 4. Use of the method according to one of the preceding claims for structural components in motor vehicles made of an AISil OMnMg alloy, wherein the magnesium content between 0.05 and 0.60 wt .-%, preferably between 0.14 and 0.45 and in particular between 0, 14 and 0.30 wt .-% is.
5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet dass als Gussprobe eine Legierung im Gusszustand ohne vorherige aktive Wärmebehandlung oder eine Legierung nach einer einstufigen Wärmebehandlung oder eine Legierung nach einer zweistufigen Wärmebehandlung mit Wasser-/Luftabschreckung geprüft wird. 5. The method according to any one of the preceding claims, characterized in that the cast sample is an as-cast alloy without prior active heat treatment or an alloy after a one-stage heat treatment or an alloy after a two-stage heat treatment with water / air quenching.
EP15798419.6A 2014-12-18 2015-11-23 Method for non-destructively determining material properties Pending EP3234580A1 (en)

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US20170284967A1 (en) 2017-10-05
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US10458950B2 (en) 2019-10-29
CN106796199B (en) 2020-07-14

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