ASTM E1457-23e1 PDF

Full title and description

ASTM E1457-23e1 — Standard Test Method for Measurement of Creep Crack Growth Times in Metals. This standard specifies procedures for determining creep crack initiation (CCI) and creep crack growth (CCG) in metallic materials at elevated temperatures using pre-cracked specimens and fracture‑mechanics correlating parameters (for example, C* or K).

Abstract

The standard defines test geometries, loading arrangements, instrumentation, and analysis methods to measure the time to an initial crack extension (t0.2 for Δai = 0.2 mm) and steady‑state creep crack growth rates (da/dt) as functions of fracture‑mechanics parameters (C*, C*(t), Ct or K). It covers both creep‑ductile and creep‑brittle behavior, and gives recommendations for specimen selection, treatment of transient and steady‑state regions, and reporting of results.

General information

• Status: Current — ASTM E1457-23e1 (erratum/addendum edition published following E1457-23).
• Publication date: Originally published Nov 15, 2023 (designation 23), with the e1 update/erratum implemented subsequently (document history notes updates through Apr 16, 2024).
• Publisher: ASTM International (Committee E08 — Fatigue and Fracture, Subcommittee E08.06).
• ICS / categories: 77.040.10 — Mechanical testing of metals (fracture and crack growth testing).
• Edition / version: 23e1 (edition 2023, erratum/addendum e1).
• Number of pages: Approximately 29 pages (typical published PDF length for the 23e1 release).

Scope

This test method covers the determination of creep crack initiation (CCI) and creep crack growth (CCG) in metals at elevated temperatures using pre‑cracked specimens under static or quasi‑static loading. It defines the engineering initial crack extension (Δai = 0.2 mm) used to quantify the initiation period (t0.2) and describes how to correlate initiation time and steady‑state growth rates with fracture‑mechanics parameters such as C* or K depending on material behavior and specimen geometry. Recommended specimen geometries (for example C(T), SEN(T), SEN(B), M(T), DEN(T), C‑ring) and measurement techniques (force‑line displacement, CMOD, electric potential drop, etc.) are provided, together with guidance on residual stress effects, specimen size/constraint, and data reporting.

Key topics and requirements

• Definition and measurement of creep crack initiation time t0.2 (Δai = 0.2 mm) and steady‑state creep crack growth rate (da/dt).
• Correlation of crack growth with fracture‑mechanics parameters: C*, C*(t), Ct and K; guidance on parameter choice by material and test regime (creep‑ductile vs creep‑brittle).
• Specified specimen geometries, recommended sizes and side‑grooving; primary recommendation of compact tension C(T) specimen with additional acceptable geometries.
• Loading arrangements: constant force (pin‑loaded tension), quasi‑static/static conditions and clevis/pin fixtures; instrumentation for crack mouth/line displacement and optional electric potential drop for crack length monitoring.
• Data analysis: treatment of transient versus steady‑state regions, calculation of C* (including recommended functions for different geometries) and reporting of da/dt vs C* or K.
• Considerations for inhomogeneous materials, weldments, residual stresses, environmental effects at high temperature, and limitations for long‑duration tests.

Typical use and users

Used by materials and mechanical test laboratories, fracture‑mechanics engineers, R&D groups, and asset‑integrity teams in industries where high‑temperature creep and long‑term crack growth are critical — for example power generation (steam turbines, boilers), petrochemical and refining, aerospace, and pressure‑boundary/component life assessment. The standard provides test methods to generate material properties for life‑assessment models and failure‑predictions.

Related standards

ASTM E1457-23e1 is maintained under ASTM Committee E08 (Fatigue and Fracture) and complements other ASTM fracture‑mechanics and crack‑growth test methods (for example standards addressing fracture toughness, fatigue crack growth, and methods for crack length measurement). Users typically consult related E08 series standards (fracture toughness and crack‑growth test methods) when designing test programs or interpreting results.

Keywords

creep crack growth; creep crack initiation; CCI; CCG; C* integral; fracture mechanics; creep testing; high temperature; compact tension C(T); SEN(T); CMOD; electric potential drop; residual stress.

FAQ

Q: What is this standard?

A: ASTM E1457-23e1 is a standardized test method that defines procedures to measure creep crack initiation times and creep crack growth rates in metals at elevated temperatures using pre‑cracked specimens, and to correlate those measurements with fracture‑mechanics parameters (C*, Ct, K).

Q: What does it cover?

A: It covers specimen geometries and sizes, loading and fixturing, instrumentation (displacement, CMOD, electric potential drop), data acquisition, calculation of correlating parameters, treatment of transient vs steady‑state growth, and reporting requirements. It addresses both creep‑ductile and creep‑brittle behaviors and gives guidance for testing base materials and mixed base/weld materials.

Q: Who typically uses it?

A: Materials testing laboratories, fracture‑mechanics and materials engineers, asset integrity and life‑assessment teams in sectors such as power generation, petrochemical, aerospace, and any industry concerned with high‑temperature creep and component life.

Q: Is it current or superseded?

A: The 23e1 designation indicates the 2023 edition with an e1 erratum/addendum. E1457-23 was published Nov 15, 2023 and the e1 update/clarifications have been recorded in the document history (updates noted through Apr 16, 2024 in publisher records). Users should reference the 23e1 text as the current edition.

Q: Is it part of a series?

A: Yes — it is part of the body of ASTM fracture‑mechanics and crack‑growth test methods developed under Committee E08 (and subcommittee E08.06). It replaces or updates earlier editions of E1457 (for example 2019 and prior) and should be used alongside other relevant E08 standards for comprehensive testing programs.

Q: What are the key keywords?

A: Creep crack growth, creep crack initiation, C*, Ct, K, high‑temperature testing, compact tension specimen, SEN, CMOD, electric potential drop, fracture mechanics.