Small punch testing for determining the material toughness of low alloy steel components in service

Journal Article · Sat Oct 01 04:00:00 EDT 1994 · Journal of Engineering Materials and Technology; (United States)

DOI:https://doi.org/10.1115/1.2904313· OSTI ID:6766907

Foulds, J ^[1]; Viswanathan, R ^[2]

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1. Failure Analysis Associates, Inc., Menlo Park, CA (United States)
2. Electric Power Research Inst., Palo Alto, CA (United States)

The toughness of the low alloy ferritic steel material of structural components operating at elevated temperatures can degrade during service due to embrittling phenomena such as carbide coarsening and temper embrittlement. The extent of degradation and the current level of toughness are critical inputs to component structural integrity assessments and to operation and maintenance planning. Conventional test methods for measuring toughness require the removal of large material samples from the in-service component, which is generally impractical. However, the recent development of relatively nondestructive, miniature sample removal systems and the small punch test technique (which utilizes nonstandard, miniature specimens) now provides a convenient, practical means of evaluating the material of an in-service component for toughness and related mechanical properties. This paper describes the small punch test technique with selected examples of its application to various grades of low alloy ferritic steel.

• OSTI ID: 6766907
• Journal Information: Journal of Engineering Materials and Technology; (United States), Journal Name: Journal of Engineering Materials and Technology; (United States) Vol. 116:4; ISSN 0094-4289; ISSN JEMTA8
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
42 ENGINEERING
420500 -- Engineering-- Materials Testing
ALLOYS
FRACTURE PROPERTIES
IRON ALLOYS
IRON BASE ALLOYS
LOW ALLOY STEELS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
MINIATURIZATION
SAMPLE PREPARATION
STEELS
TESTING