Interstitial Carbon and Nitrogen Effects on the Cryogenic Fatigue Crack Growth of AISI 304 Type Stainless Steels

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Volume 12, Issue 6 (November 1984)

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ISSN: 0090-3973
Page Count: 7

Interstitial Carbon and Nitrogen Effects on the Cryogenic Fatigue Crack Growth of AISI 304 Type Stainless Steels
Tobler, RL
Metallurgist and division chief, National Bureau of Standards, CO

Reed, RP

Abstract

Constant-load-amplitude fatigue crack propagation (FCP) rate measurements are reported for AISI 304 (Unified Numbering System [UNS] S30400) type stainless steels having variable carbon-plus-nitrogen (C+N) contents. Rates at stress-intensity factors from 20 to 70 MPa ·m^½ were measured using 25-mm-thick compact specimens. The Fe-18Cr-10Ni steels tested exhibited partial martensitic phase transformations during tests at 76 and 4K, but not during tests at 295 K. The behavior varied considerably with composition: at high C+N contents (0.187% by weight or greater) the FCP resistance was lower at 4 than at 295 K, whereas at low C+N contents (0.067% by weight) the FCP resistance was significantly higher at 4 than at 295 K. The improved cryogenic behavior at low C+N contents was associated with a transition in failure micromechanisms.

Keywords:
austenitic stainless steels, crack propagation, cryogenics, mechanical properties, fatigue (materials), low temperature tests, martensitic phase transformation, stainless steels

Paper ID: JTE10741J
DOI: 10.1520/JTE10741J
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Author Title Interstitial Carbon and Nitrogen Effects on the Cryogenic Fatigue Crack Growth of AISI 304 Type Stainless Steels Symposium , 0000-00-00 Committee A01

		Home Journals STPs Manuals Topics Subscriptions/Pricing Digital Library / Journals / Journal of Testing and Evaluation (JTE) / Citation Page Volume 12, Issue 6 (November 1984) Click here to download this paper now for $25 PDF (496K) View License Agreement ISSN: 0090-3973 Page Count: 7 Interstitial Carbon and Nitrogen Effects on the Cryogenic Fatigue Crack Growth of AISI 304 Type Stainless Steels Tobler, RL Metallurgist and division chief, National Bureau of Standards, CO Reed, RP Abstract Constant-load-amplitude fatigue crack propagation (FCP) rate measurements are reported for AISI 304 (Unified Numbering System [UNS] S30400) type stainless steels having variable carbon-plus-nitrogen (C+N) contents. Rates at stress-intensity factors from 20 to 70 MPa ·m^½ were measured using 25-mm-thick compact specimens. The Fe-18Cr-10Ni steels tested exhibited partial martensitic phase transformations during tests at 76 and 4K, but not during tests at 295 K. The behavior varied considerably with composition: at high C+N contents (0.187% by weight or greater) the FCP resistance was lower at 4 than at 295 K, whereas at low C+N contents (0.067% by weight) the FCP resistance was significantly higher at 4 than at 295 K. The improved cryogenic behavior at low C+N contents was associated with a transition in failure micromechanisms. Keywords: austenitic stainless steels, crack propagation, cryogenics, mechanical properties, fatigue (materials), low temperature tests, martensitic phase transformation, stainless steels Paper ID: JTE10741J DOI: 10.1520/JTE10741J ASTM International is a member of CrossRef. Author Title Interstitial Carbon and Nitrogen Effects on the Cryogenic Fatigue Crack Growth of AISI 304 Type Stainless Steels Symposium , 0000-00-00 Committee A01