Metallurgical Origins of Fracture Toughness and Microstructure and Fracture Toughness of an HSLA (High-Strength/Low-Alloy) Steel.

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Abstract:

The report discusses effects of composition and heat treatment on the fracture behavior of a group of steels based on ASTM A712A. Very low transition temperatures were observed in a number of cases. However, adverse effects of Cu on the K sub Ic value for cleavage and on the sharpness of the ductilebrittle transition are noted. At ambient temperatures, overaged Cu particles are beneficial for ductile fracture resistance. A new experimental method of evaluating the relative contributions of opening and shear to ductile crack growth was developed, along with a superdislocation model of the process. Keywords Steel, high-strengthlow alloy Microstructural effects Compositional effects Fracture statistics Constitutive Modelling.

Author(s):
Rosenfield, A. R. ; Hirth, J. P. ; Schroth, J. G.
Author Organization(s):
BATTELLE COLUMBUS LABS OH
Descriptive Note:
Final rept. 15 Aug 78-14 Aug 81, 1 Jan 82-31 Dec 84,
Supplementary Note:
Prepared in cooperation with Ohio State Univ., Columbus. Dept. of Metallurgical Engineering.
Pagination:
0011

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
ARO-15689.9-MS, ARO-18399.7-MS
Contract/Grant Number(s):
DAAG29-78-C-0031, DAAG29-82-K-0033
Monitor Series:
15689.9-MS, 18399.7-MS
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_5.3_Planning; JCA_5.3.1_Analyze Problem; JCA_1_Force Support; JCA_1.3_Human Capital Management; JCA_3.2_Engagement; JCA_3_Force Application
Communities of Interest:
Human Systems
Descriptor(s):
*CRACK PROPAGATION, *LOW ALLOY STEELS, SHEAR PROPERTIES, TEMPERATURE, MICROSTRUCTURE, MODELS, STATISTICS, TOUGHNESS, HIGH STRENGTH ALLOYS, ALLOYS, FRACTURE(MECHANICS), HEAT TREATMENT, DUCTILE BRITTLE TRANSITION, PARTICLES, HIGH STRENGTH, COPPER, ADVERSE CONDITIONS, LOW LEVEL, DUCTILITY, COMPOSITION(PROPERTY), CLEAVAGE, PHYSICAL METALLURGY
Field(s)/Group(s):
Properties of Metals and Alloys
Keyword(s):
*Fracture toughness, HSLA (High Strength Low Alloy), Constitutive modelling, Fracture resistance
Report Date:
1985 May 31