Failure analysis allows to determine the causes of a component’s failure or malfunctioning.
Destructive and non destructive tests support Sider Test in providing a quick and accurate diagnosis of the root cause of the failure and suggesting metallurgical solutions in order to prevent or tackle the recurrence of the damaging phenomenon.
A proper failure analysis requires our technicians and materials engineers to collect as many details as possible about the design, the production, the use and the service conditions of the component.
Modern instruments and techniques of magnification (including SEM-EDS analysis) allow to scan the fracture surface (fractography), in order to get information about the nature of the fracture occurred (i.e. ductile or brittle failure), the crack initiation and its extension. These tests and inspections, supported by the information provided by the customer and integrated by technical documents as material certificates and component’s drawings will help our technicians to detect the origin of the failure, that could derive by errors in design, non-conforming material, inappropriate heat treatment, inadequate working conditions or many other factors.
Corrosion tests consist in attacking metal specimens with specific chemicals according to the conditions stated by the standards. The reactions that occur are electrochemical phenomena revealing the material’s resistance against environmental aggressive agents and toward wear.
Sider Test performs these tests according to accredited methods.
With reference to HIC (Hydrogen Induced Cracking) Test, according to NACE TM0284/TM0177, SSC (Sulphide Stress Cracking) Test, according to NACE TM0177) and the assessing of the degree of banding of microstructures, Sider Test is the only Italian laboratory approved by PDO (Petroleum Development Oman).
Kinds of corrosion tests executed:
INTERGRANULAR CORROSION TESTS
- Resistance to intergranular corrosion of ferritic, austenitic and duplex stainless steels
- Resistance to intergranular corrosion of austenitic and duplex stainless steels (Huey corrosion)
- Resistance to intergranular corrosion of austenitic stainless steels
- Resistance to intergranular corrosion of nickel rich chromium bearing alloys
PITTING AND CREVICE
HYDROGEN INDUCED CORROSION TESTS
Metallographic examinations use magnification techniques to study in deep the material’s structure. In this kind of examination technicians experience and competence are fundamental.
All the metallographic tests are executed by experienced personnel with modern instrumentation.
Main metallographic tests:
- ASSESSMENT OF THE DEGREE OF BANDING OF MICROSTRUCTURES
- DETERMINATION OF THE AVERAGE GRAIN SIZE
- DETERMINATION OF THE VOLUME FRACTION BY SYSTEMATIC MANUAL POINT COUNT
- DETERMINATION OF THE INCLUSION CONTENT OF STEEL
- DETECTION OF DETRIMENTAL INTERMETALLIC PHASE
- MICROGRAPHIC EXAMINATION
- MACROGRAPHIC EXAMINATION
- METALLOGRAPHIC EXAMINATIONS BY MEANS OF REPLICAS
Mechanical tests include:
Controlled heating and cooling alter the microstructure of the metallic materials influencing their physical properties.
Throughout heat treating ovens (dimensions of 300x500x600 mm and 260x400x800 mm) the laboratory can simulate tempering, stress relieving, annealing, normalizing, quenching and solution annealing of the test samples.
NON DESTRUCTIVE TESTS
Non destructive testing can detect defects without harming the material or affecting its operating performance.
Non destructive methods:
- LIQUID PENETRANT
- MAGNETIC PARTICLE
- VISUAL INSPECTION
- X-RAY AND GAMMA RAY INSPECTIONS
Our personnel can execute non destructive tests according the above listed methods both in Sider Test or where the client’s facility is based.
Referring to radiographic and gammagraphic inspections, Sider Test’s facilities include two bunkers with equipment that can examinate materials with a maximum thickness of 90 mm. Gammagraphic equipment uses gamma-emitting isotope Ir-192. Non destructive tests staff is qualified II and III levels according to SNT-TC-1A and ISO 9712.
Dimensional inspection assesses the geometric characteristics of a component to assure its compliance with design specifications.
The instrumentation used in the dimensional metrology includes a CMM (Coordinate Measuring Machine) with a measuring range of 700x500x500 mm, surface roughness measuring machines, digital gauges, micrometers and comparators.
Dimensional inspection is both provided to customers and executed in order to verify the compliance of the geometrical dimensions of the test samples to those indicated by the standards.
In the last years Sider Test has been improving its workshop’s activity, where test specimens are prepared. This way waiting times have been strongly reduced. The activity of samples preparation is provided to all the customers having an internal laboratory. The workshop prepares samples for all kinds of test.