ENGLISH
|
JAPANESE
|
CONNECT WITH US:
Home
About
Contact
Log in
*
Home
Press release
Feb 06, 2020 14:00 JST
Source:
Science and Technology of Advanced Materials
Measuring the wear and tear of metals
Half a century of metal testing aims to make Japan's industries safe.
TSUKUBA, Japan, Feb 06, 2020 - (ACN Newswire) - For the past 50 years, researchers at the National Institute for Materials Science (NIMS) have been conducting detailed short- and long-term testing of a wide variety of structural materials manufactured in Japan to ensure they can withstand long-term stresses. Now, NIMS scientists have reviewed this data, in the journal Science and Technology of Advanced Materials, summarizing the institute's major findings.
Pipe Specimen for power plant ruptured by internal pressure creep test.
In 1966, NIMS's predecessor, the National Research Institute for Metals, launched its 'creep data sheet project'. The aim of this project was to determine the stress required to rupture heat-resistant steels and alloys in 100,000 hours (about 11.4 years) at high temperatures. This 'creep rupture strength' data was initially needed to determine the allowable stresses metals could be exposed to in power plants. But more recently, this data has been used to assess how much longer power plant parts have before they begin to wear and tear.
Just over a decade later, in 1978, NIMS also began assembling what has become a huge database of fatigue properties of structural materials used in numerous industries, including automobiles and aircrafts. Fatigue describes how cracks propagate in a metal over time. Fatigue tests involve placing a metal sample under repetitive loads, called cycles, to see how long it takes for a crack to develop and propagate. These tests are conducted at room temperature and high temperatures. Samples are exposed to a relatively small number of cycles (in the range of 10 million cycles) or up to 10 billion cycles, lasting for several years.
NIMS data has revealed that the long-term creep strength of materials varies, and that scientists need to choose the type of analysis method for creep rupture data according to the type of material. How creep happens in materials during testing not only depends on the amount of stress applied, but also on the temperature conditions. The researchers have found that materials react differently to varying temperature depending on their chemical composition, the amounts of minor elements in them, and the crystal grain size. Ferritic heat-resistant steels, which are commonly used in thermal power plants, were found to have very long-term, inherent creep strength. But this creep strength is dependent on the amount of minor solutes present in the steel.
Fatigue limits, on the other hand, are affected by a metal's tensile strength and hardness. Interestingly, NIMS scientists have found that some metals can last for an incredibly long time without forming cracks as long as they are constantly exposed to room temperatures. These same metals, however, would eventually form cracks if exposed to the same stress but at high temperature.
Up until now, the creep and fatigue data sheets developed at NIMS have been used mainly for industrial purposes. The institution is now aiming to improve accessibility so the data can also be used by academics.
Further information
Kota Sawada
National Institute for Materials Science
SAWADA.Kota@nims.go.jp
Yoshiyuki Furuya
National Institute for Materials Science
FURUYA.Yoshiyuki@nims.go.jp
Papers
https://doi.org/10.1080/14686996.2019.1697616
https://doi.org/10.1080/14686996.2019.1680574
About Science and Technology of Advanced Materials Journal
Open access journal STAM publishes outstanding research articles across all aspects of materials science, including functional and structural materials, theoretical analyses, and properties of materials.
Shunichi Hishita
STAM Publishing Director
HISHITA.Shunichi@nims.go.jp
Press release distributed by ResearchSEA for Science and Technology of Advanced Materials.
Source: Science and Technology of Advanced Materials
Sectors: Metals & Mining, Science & Nanotech
Copyright ©2024 ACN Newswire. All rights reserved. A division of Asia Corporate News Network.
Latest Release
Fujitsu SX Survey reveals key success factors for sustainability
Apr 23, 2024 10:25 JST
Fujitsu and METRON collaborate to drive ESG success: slashing energy costs, boosting productivity with new manufacturing industry solutions
Apr 22, 2024 16:09 JST
NEC Strengthens Commitment to Space Industry with Investment in Seraphim Space Venture Fund II
Apr 22, 2024 15:09 JST
Soft Space Launches the First and Only JCB Payment Gateway in Malaysia
Apr 22, 2024 15:00 JST
TOYOTA GAZOO Racing takes a one-two in Croatian thriller
Apr 22, 2024 10:47 JST
First-ever Mazda CX-80 Crossover SUV Unveiled in Europe
Apr 19, 2024 13:50 JST
Fujitsu develops technology to convert corporate digital identity credentials, enabling participation of non-European companies in European data spaces
Apr 19, 2024 10:17 JST
Mitsubishi Heavy Industries and NGK to Jointly Develop Hydrogen Purification System from Ammonia Cracking Gas
Apr 18, 2024 17:01 JST
Toyota Launches All-New Land Cruiser "250" Series in Japan
Apr 18, 2024 13:39 JST
Fujitsu and Oracle collaborate to deliver sovereign cloud and AI capabilities in Japan
Apr 18, 2024 11:14 JST
Eisai: Research on Treatments for Alzheimer's Disease Based on Its Pathological Mechanisms Recieves Award for Science and Technology (Research Category)
Apr 18, 2024 10:53 JST
All-New Triton Confirmed as First Double-Cab Pickup Truck to Achieve 2024 Five-Star ANCAP Safety Rating
Apr 18, 2024 09:22 JST
Eisai's Antiepileptic Drug Fycompa Injection Formulation Launched In Japan
Apr 17, 2024 16:17 JST
Honda Unveils Next-generation EV Series for China
Apr 17, 2024 12:15 JST
Lexus presents Time at the 2024 Milan Design Week
Apr 16, 2024 18:49 JST
Mitsubishi Corporation Announces Participation in a DAC Project in Louisiana, USA
Apr 16, 2024 14:36 JST
New circuit challenge for TOYOTA GAZOO Racing
Apr 15, 2024 17:21 JST
TOYOTA GAZOO Racing back on asphalt for Croatian challenge
Apr 12, 2024 19:36 JST
Heidelberg Materials North America Announces Latest Milestone in Edmonton CCUS Project
Apr 12, 2024 14:39 JST
MHIAEL Completes Expansion of the its Nagasaki Plant for Manufacture of Aero Engine Combustors
Apr 11, 2024 18:08 JST
More Latest Release >>
Related Release
A new spin on materials analysis
April 17 2024 22:00 JST
Kirigami hydrogels rise from cellulose film
April 12 2024 18:00 JST
Sensing structure without touching
February 27 2024 08:00 JST
Nano-sized probes reveal how cellular structure responds to pressure
November 21 2023 07:00 JST
Machine learning techniques improve X-ray materials analysis
November 17 2023 10:00 JST
A bio-inspired twist on robotic handling
November 14 2023 20:00 JST
GPT-4 artificial intelligence shows some competence in chemistry
October 17 2023 08:00 JST
Closing the loop between artificial intelligence and robotic experiments
August 24 2023 09:00 JST
Machine intelligence for designing molecules and reaction pathways
May 24 2023 09:00 JST
Face-down: Gravity's effects on cell movement
May 13 2023 00:00 JST
More Press release >>