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Title: DEVELOPMENT OF ELECTROPLATING PROCESSES TO ELIMINATE HYDROGEN EMBRITTLEMENT IN HIGH-STRENGTH STEEL. Period Covered: February 1956 to May 1957

Abstract

The embrittlement of cadmium plated high-strength steels e.g., (SAE 4340) by hydrogen is of serious concern to the Air Force. Unexpected failures of highly stressed components have been experienced. It has been found that cadmium plating from a sulfamate, a perchlorate, or a fluoborate bath wdth addition agents can be accomplished without embrittling the steel, but that the quality and adherence of the cadmium plate emerging from these baths as compared with the cadmium plate from a cyanide bath, indicates the need for further evaluation before use. In order to evaluate the effects of various degrees of hydrogen embrittlement on the steel, a sensitive mechanical test method was required. The important criteria were that the test coupon be of such geometry that it could be plated uniformly and that the test would evaluate only the effect of hydrogen embrittlement. Simple bend tests and notched bar tensile tests have been commonly used for studying the embrittling effect. The bend test, torsion test, and static sustained load beam test were investigated. A static sustained load beam test, using a 9- x 1/4- x 1/2-in. specimen with the grain transverse to the length was adopted. The SAE 4340 specimens were heat treated tomore » 280,000 to 300,000 psi tensile strength and the fracture time, under a given stress, was taken as a measure of the degree of hydrogen embrittiement. it was found that replicate specimens show a large deviation in fracture times in spite of the care that was given to the selection preparatlon, and testing techniques. These deviations are due to the normal defects and variables that are present in commercial, air melted, aircraft quality steel. (auth)« less

Authors:
Publication Date:
Research Org.:
Stanford Research Inst., Menlo Park, Calif.
OSTI Identifier:
4306771
Report Number(s):
WADC-TR-57-514; AD-142316
NSA Number:
NSA-12-007268
DOE Contract Number:  
AF33(616)-3429
Resource Type:
Technical Report
Resource Relation:
Other Information: Project title: FINISHES AND MATERIALS PRESERVATION. Task title: ELECTRODEPOSITION AND ELECTROCHEMICAL TREATMENTS. Orig. Receipt Date: 31-DEC-58
Country of Publication:
United States
Language:
English
Subject:
MINERALOGY, METALLURGY, AND CERAMICS; ADHESION; AIR; AIRCRAFT; BORIDES; BRITTLENESS; CADMIUM; CHLORIDES; CONTROL; CYANIDES; DEFECTS; ELECTROCHEMISTRY; ELECTRODEPOSITION; ELECTROPLATING; FAILURES; FLUORIDES; GRAIN BOUNDARIES; HEAT TREATMENTS; HYDROGEN; MATERIALS TESTING; MECHANICS; MELTING; PLATING; PREPARATION; ROTATION; STEELS; STRESSES; SULFATES; TENSILE PROPERTIES; VARIATIONS

Citation Formats

Chilton, J.E. DEVELOPMENT OF ELECTROPLATING PROCESSES TO ELIMINATE HYDROGEN EMBRITTLEMENT IN HIGH-STRENGTH STEEL. Period Covered: February 1956 to May 1957. United States: N. p., 1957. Web.
Chilton, J.E. DEVELOPMENT OF ELECTROPLATING PROCESSES TO ELIMINATE HYDROGEN EMBRITTLEMENT IN HIGH-STRENGTH STEEL. Period Covered: February 1956 to May 1957. United States.
Chilton, J.E. Fri . "DEVELOPMENT OF ELECTROPLATING PROCESSES TO ELIMINATE HYDROGEN EMBRITTLEMENT IN HIGH-STRENGTH STEEL. Period Covered: February 1956 to May 1957". United States. doi:.
@article{osti_4306771,
title = {DEVELOPMENT OF ELECTROPLATING PROCESSES TO ELIMINATE HYDROGEN EMBRITTLEMENT IN HIGH-STRENGTH STEEL. Period Covered: February 1956 to May 1957},
author = {Chilton, J.E.},
abstractNote = {The embrittlement of cadmium plated high-strength steels e.g., (SAE 4340) by hydrogen is of serious concern to the Air Force. Unexpected failures of highly stressed components have been experienced. It has been found that cadmium plating from a sulfamate, a perchlorate, or a fluoborate bath wdth addition agents can be accomplished without embrittling the steel, but that the quality and adherence of the cadmium plate emerging from these baths as compared with the cadmium plate from a cyanide bath, indicates the need for further evaluation before use. In order to evaluate the effects of various degrees of hydrogen embrittlement on the steel, a sensitive mechanical test method was required. The important criteria were that the test coupon be of such geometry that it could be plated uniformly and that the test would evaluate only the effect of hydrogen embrittlement. Simple bend tests and notched bar tensile tests have been commonly used for studying the embrittling effect. The bend test, torsion test, and static sustained load beam test were investigated. A static sustained load beam test, using a 9- x 1/4- x 1/2-in. specimen with the grain transverse to the length was adopted. The SAE 4340 specimens were heat treated to 280,000 to 300,000 psi tensile strength and the fracture time, under a given stress, was taken as a measure of the degree of hydrogen embrittiement. it was found that replicate specimens show a large deviation in fracture times in spite of the care that was given to the selection preparatlon, and testing techniques. These deviations are due to the normal defects and variables that are present in commercial, air melted, aircraft quality steel. (auth)},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Nov 01 00:00:00 EST 1957},
month = {Fri Nov 01 00:00:00 EST 1957}
}

Technical Report:
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