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Title: The influence of tempering temperature on small fatigue crack behavior monitored with surface acoustic waves in quenched and tempered 4140 steel

Abstract

The authors describe their investigation of small surface fatigue crack growth in specially designed cantilevered bending samples of high-purity 4140 steel quenched and tempered to various strength levels. Tempering temperatures of 200 {sup 0}C, 400 {sup 0}C, 550 {sup 0}C and 700 {sup 0}C were used to produce a range of yield strengths and microstructures. Crack propagation and crack closure were monitored with a surface acoustic wave ultrasonic technique. The small crack results were compared to those of long cracks in compact tension samples. Small cracks in the 200 {sup 0}C and 400 {sup 0}C tempers grew at {Delta}{Kappa} levels above their long crack thresholds. Small cracks in the 550 {sup 0}C tempers grew at {Delta}{Kappa} levels slightly below the long crack threshold. The surface cracks in the 700{sup 0}C temper grew well below the long crack threshold showing the small crack effect.

Authors:
 [1];  [2];  [3]
  1. McDonnell Douglas Research Labs., St. Louis, MO (USA)
  2. Stanford Univ., CA (USA). Dept. of Mechanical Engineering
  3. Failure Analysis Associates, Palo Alto, CA (USA)
Publication Date:
OSTI Identifier:
5308710
Resource Type:
Journal Article
Journal Name:
Metallurgical Transactions, (Section) A: Physical Metallurgy and Materials Science; (USA)
Additional Journal Information:
Journal Volume: 20A:7; Journal ID: ISSN 0360-2133
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING; STEELS; CRACK PROPAGATION; ACOUSTIC MONITORING; FATIGUE; MICROSTRUCTURE; TEMPERATURE EFFECTS; ALLOYS; CRYSTAL STRUCTURE; IRON ALLOYS; IRON BASE ALLOYS; MECHANICAL PROPERTIES; MONITORING; 360103* - Metals & Alloys- Mechanical Properties; 360102 - Metals & Alloys- Structure & Phase Studies; 360104 - Metals & Alloys- Physical Properties; 420500 - Engineering- Materials Testing

Citation Formats

London, B, Nelson, D V, and Shyne, J C. The influence of tempering temperature on small fatigue crack behavior monitored with surface acoustic waves in quenched and tempered 4140 steel. United States: N. p., 1989. Web. doi:10.1007/BF02647408.
London, B, Nelson, D V, & Shyne, J C. The influence of tempering temperature on small fatigue crack behavior monitored with surface acoustic waves in quenched and tempered 4140 steel. United States. https://doi.org/10.1007/BF02647408
London, B, Nelson, D V, and Shyne, J C. 1989. "The influence of tempering temperature on small fatigue crack behavior monitored with surface acoustic waves in quenched and tempered 4140 steel". United States. https://doi.org/10.1007/BF02647408.
@article{osti_5308710,
title = {The influence of tempering temperature on small fatigue crack behavior monitored with surface acoustic waves in quenched and tempered 4140 steel},
author = {London, B and Nelson, D V and Shyne, J C},
abstractNote = {The authors describe their investigation of small surface fatigue crack growth in specially designed cantilevered bending samples of high-purity 4140 steel quenched and tempered to various strength levels. Tempering temperatures of 200 {sup 0}C, 400 {sup 0}C, 550 {sup 0}C and 700 {sup 0}C were used to produce a range of yield strengths and microstructures. Crack propagation and crack closure were monitored with a surface acoustic wave ultrasonic technique. The small crack results were compared to those of long cracks in compact tension samples. Small cracks in the 200 {sup 0}C and 400 {sup 0}C tempers grew at {Delta}{Kappa} levels above their long crack thresholds. Small cracks in the 550 {sup 0}C tempers grew at {Delta}{Kappa} levels slightly below the long crack threshold. The surface cracks in the 700{sup 0}C temper grew well below the long crack threshold showing the small crack effect.},
doi = {10.1007/BF02647408},
url = {https://www.osti.gov/biblio/5308710}, journal = {Metallurgical Transactions, (Section) A: Physical Metallurgy and Materials Science; (USA)},
issn = {0360-2133},
number = ,
volume = 20A:7,
place = {United States},
year = {Sat Jul 01 00:00:00 EDT 1989},
month = {Sat Jul 01 00:00:00 EDT 1989}
}