Investigations on precipitation characteristics in a high strength low alloy (HSLA) steel
- National Metallurgical Lab., Jamshedpur (India)
The nature of precipitation and the solutionizing temperature of the precipitates are crucial factors in controlling the strength of high strength low alloy steels. Niobium, vanadium and titanium are the elements most commonly added to HSLA steels to produce fine precipitates and grain refinement. In addition to these, other alloying additions such as chromium, molybdenum and manganese are also made. Copper is added to provide age hardening. Addition of copper is accompanied by a proportional level of nickel in these steels. Such a complex scenario of alloying additions can influence the mass transfer kinetics as well as equilibrium precipitation. Therefore, steels of similar chemistry can exhibit different precipitation behaviour as has been already observed in some cases. Investigations made on the precipitation behaviour, in the austenitic range, of two steels are reported in this communication. The precipitates were studied for their morphology, size and chemistry. SEM along with EDX has been employed in characterizing these precipitates. A few TEM results have been included. The solutionizing temperatures of the precipitates were computed from thermodynamic models and compared with experimental observations.
- OSTI ID:
- 634748
- Journal Information:
- Scripta Materialia, Vol. 39, Issue 2; Other Information: PBD: 12 Jun 1998
- Country of Publication:
- United States
- Language:
- English
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