Publications

Displaying 1 - 25 of 44

Using "Off-the-Shelf" AISI 4340 Steel for the Production of NIST Reference Charpy Specimens

January 7, 2025

Author(s)

Enrico Lucon, Allen Eckhardt, Raymond Santoyo

We investigated the suitability of using readily available ("off-the-shelf"), as opposite to made-to-order, AISI 4340 steel for the production of NIST reference Charpy specimens of low- and high-energy level. This study was preceded by technical

Second Charpy Interlaboratory Comparison Between NIST and Anand Testing Machine Services

August 22, 2024

Author(s)

Enrico Lucon, Allen Eckhardt, Raymond L. Santoyo

We report the results of the second Charpy Interlaboratory Comparison between NIST (National Institute of Standards and Technology, Boulder, Colorado, USA) and ATMS (Anand Testing Machine Services, Kabnur, India). The first comparison was run in 2022, and

Optimized Heat Treatment for NIST Certified Low-Energy Charpy Specimens to Be Tested at 21 degC

July 11, 2024

Author(s)

Enrico Lucon, Allen Eckhardt, Raymond L. Santoyo

The NIST Charpy Machine Verification Program has recently decided to change the test temperature for low-energy and high-energy certified reference specimens from -40 °C to 21 °C. Consequently, low-energy specimens currently tend to remain in the impact

Dimensional Inspection of Charpy Indirect Verification Specimens By Means of a Digital Optical Comparator

February 26, 2024

Author(s)

Enrico Lucon, Raymond L. Santoyo, Allen Eckhardt

The Charpy reference specimens produced by NIST for the indirect verification of Charpy machines in accordance with ASTM E23 and ISO 148-1 must satisfy strict dimensional requirements, with tolerances that are in most cases tighter than those prescribed by

Charpy Interlaboratory Comparison Between NIST and Anand Testing Machine Services

December 12, 2022

Author(s)

Enrico Lucon, Raymond L. Santoyo

Results are reported of an Interlaboratory Comparison between NIST (National Institute of Standards and Technology, Boulder, Colorado, USA) and ATMS (Anand Technical Machine Services, Kabnur, India). The study consisted in testing in both locations

Analyzing the NIST Charpy Program Database: Influence of Impact Hammer Type (C vs. U) on Test Results

July 20, 2022

Author(s)

Enrico Lucon, Raymond L. Santoyo

The NIST Charpy Machine Verification Program supplies ASTM E23 certified Charpy reference specimens to customers all over the world since 1989, when the program was transferred from the US Army at Watertown Arsenal, Massachusetts. Starting in 1993

Standard Reference Materials - Certification Report for SRM 2237, 2238, 2239: RHS (Miniaturized) Charpy V-Notch Impact Specimens

May 11, 2021

Author(s)

Enrico Lucon, Raymond L. Santoyo, Jolene D. Splett

This Certification Report documents the procedures used to develop certified values of absorbed energy (KV) for the following RHS (Reduced Half-Size)-type miniaturized verification Charpy V-notch impact specimens: • SRM 2237 (low-energy level, KV = 3.87 J)

Effect of tempering on the ductile-to-brittle transitional behavior of Ni-Cr-Mo low-alloy steel

July 1, 2020

Author(s)

Frank W. DelRio, May L. Martin, Raymond L. Santoyo, Enrico Lucon

Background: About ten years ago, super-high energy Charpy specimens at the National Institute of Standards and Technology were removed from inventory due to unacceptable variability in absorbed energy, leading to the advent of new methods and materials to

Influence of Machine Anvil Wear on Charpy Test Results

May 12, 2020

Author(s)

Enrico Lucon, Raymond L. Santoyo

We investigated the influence of the state of wear of Charpy machine anvils on test results by performing impact tests on NIST specimens of three energy levels with a machine equipped with new anvils (compliant with both ASTM E23 [1] and ISO 148-2 [2]) and

Influence of Anvil Wear on Charpy Test Results  NIST Contribution to an International Study

March 31, 2020

Author(s)

Enrico Lucon, Raymond L. Santoyo

We investigated the influence of the state of wear of Charpy machine anvils on test results by performing impact tests on NIST specimens of three energy levels with a machine equipped by new anvils (compliant with both ASTM E23 and ISO 148-2) and worn

Charpy Interlaboratory Comparison between NIST and the Beijing Institute of Metrology (BIM)

September 12, 2019

Author(s)

Enrico Lucon, Raymond L. Santoyo

The Beijing Institute of Metrology (BIM, China) and NIST have participated in an interlaboratory comparison, in which reference Charpy specimens of three energy levels were tested. Each laboratory tested 75 specimens supplied by the other institute, 25 per

Impact Toughness Modification of NIST Low-Energy Charpy Verification Specimens for Testing at Room Temperature

March 27, 2017

Author(s)

Enrico Lucon, Raymond L. Santoyo

The possibility for NIST to certify Charpy reference specimens for testing at room temperature (21 °C ± 1 °C) instead of −40 °C has been investigated in a previous study, in which a slightly increased likelihood of specimen jamming was observed at the low

A Comparative Analysis of NIST Charpy Machines and Internal Reference Materials

August 23, 2016

Author(s)

Enrico Lucon, Raymond L. Santoyo

This report documents the results of a series of comparative analyses which were conducted at on the Charpy machines located at NIST in Boulder, Colorado. The analyses were performed both on historical data, collected over a period of more than 20 years

Certification of NIST Room Temperature Low-Energy and High-Energy Charpy Verification Specimens

December 2, 2015

Author(s)

Enrico Lucon, Christopher N. McCowan, Raymond L. Santoyo

The feasibility of certifying Charpy reference specimens for testing at room temperature (21 °C ± 1 °C) instead of −40 °C was demonstrated at NIST by performing 130 room-temperature tests from five low-energy and four high-energy lots of steel on the three

NIST Room Temperature Low-Energy and High Energy Verification Specimens: Feasibility Study

October 21, 2015

Author(s)

Enrico Lucon, Christopher N. McCowan, Raymond L. Santoyo

The feasibility of certifying Charpy reference specimens (SRMs) for testing at room temperature (RT, 21 °C ± 1 °C) instead of -40 °C was demonstrated at NIST by performing 130 RT tests from nine low-energy and high-energy lots on the three master machines

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