THE EFFECTS OF CARBON, PHOSPHOROUS, AND ALLOY CONTENTS ON THE NOTCHED BAR IMPACT PROPERTIES OF QUENCHED AND TEMPERED STEELS
Abstract
The V-notch Charpy impact properties of eight alloy grades of quenched and tempered steel have been investigated. In addition to presenting additional data on the effects of carbon, phosphorous, and alloy contents on the impact properties, the report includes data from past reports on these subjects. Three types of brittleness, manifested by high transition temperatures, are observed: 1. ''A'' brittleness, or 500 deg F embrittlement. This phenomenon is universally exhibited by practically all steels at all carbon levels and is greatest for the highest carbon levels and is greatest for the highest carbon level, 0.80% C. 2. ''B'' brittleness, or the 1200 deg F reversal. This is exhibited by the 2300 series and consists of an elevation in transition temperature for specimens tempered at 1200 deg F. 3. Temper brittleness. This is observed principally in the 0.80% C heat of each grade with the exception of the 2300 series. Steels containing molybdenum exhibit less temper brittleness than those containing no molybdenum. The transition temperature of a quenched and tempered steel is dependent, among other things, on carbon content, alloy content, and tempering temperature. Curves are presented relating these variables, which can be used to choose the optimum carbon level, alloy grade, and tempering temperature. Phosphorous raises the transition temperatures of 4100 and 5100 steels at practically all carbon levels and hardnesses. The deletrious effect of this element is greater in the 5100 grade, which contains no molybdenum, than in the 4100 grade, which contains molybdenum.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 24, 1953
- Accession Number
- AD0008563
Entities
People
- H. Schwartzbart
- J. P. Sheehan
Organizations
- IIT Research Institute