Hot ductility of steel 09G2S

Metal Science and Heat Treatment - Hot ductility of steel 09G2S is studied in a temperature range of 600 – 1000°C on the branch of cooling after heating to a high (1150°C)...     

Quenching steel 09G2S from the intercritical temperature range with the use of rapid austenitization

A promising method for improving the strength properties of low-carbon steels is quenching from the intercritical temperature range. This process is quite simply carried out in metallurgical production on the rolling mill stream, as well as in a heat treating shop using separate heating. In this article the specifics of quenching from the intercritical temperature range with the use of electrical heating are considered.Institute of Metal Physics, Academy of Sciences of the Ukraine, Kiev. UkrNIIKM Prometei, Mariupol'. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 8, pp. 15–17, August, 1994.     

Toughness of steel 09G2S at low temperatures in relation to cleanness of grain boundaries

Conclusions It was found that it is possible to improve the toughness of steel 09G2S in the transverse direction at –40°C by adding aluminum, ferrocerium, or calcium—silicon. The toughness is directly proportional to the total number of grain boundaries contaminated with nonmetallic inclusions and their shape—the less contaminated the grain boundaries and the closer the shape of nonmetallic inclusions to spheroidal, the higher the toughness.Kramatorsk Scientific-Research and Design-Technological Institute of Machine Construction. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5, p. 68, May, 1975.     

Tendency of steels 10KhSND and 09G2S towards brittle failure

Conclusions The tendency towards brittle failure of low-alloy steels type 10KhSND and 09G2S at low temperatures depends on the supply condition. The highest resistance to brittle failure occurs for steel after temper hardening, i.e., quenching and high-temperature tempering. A changeover into a brittle condition for temper hardened steels of the test melts commences at –60°C, and for hot-rolled steels it commences at –40°C."Kompozit." Scientific-Production Organization. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5, pp. 14–16, May, 1993.     

High-temperature thermoplastic strengthening of steels St3sp and 09G2S

Conclusions We worked out a regime of high-temperature thermoplastic treatment of steels St3sp and 09G2S consisting in austenization at 1020°C, strain (=200%, =5.7%) at 940°C with subsequent cooling at a rate >100°C/sec.As a result of such treatment the tensile strength of steel St3sp is increased to 1230 N/mm², of steel 09G2S to 960 N/mm², and the conventional yield strength to 1100 and 840 N/mm², respectively.N. É. Bauman Moscow State Technical University. All-Union Research Institute of Metallurgical Machinery Construction. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 18–19, July, 1991.     

Electron-microscopic examination of microstructural changes in structural martensitic steel after low-cyclic fatigue tests

Microstructural changes in a structural martensitic steel upon low-cyclic fatigue (LCF) deformation have been investigated. The micromechanics of plastic deformation and accompanying effects have been studied at the scale of martensite laths and packets with the aid of transmission electron microscopy (TEM). It has been shown that with increasing LCF deformation, changes in both the morphology and the internal structure of martensite occur. The changes are manifested in the form of a refinement of the structural units of martensite. It has been revealed that in the limits of a packet the fatigue deformation occurs inhomogeneously. However, the laths of the same orientation are deformed equally and almost simultaneously. The influence of the dimensions of former austenite grains and orientation of packets on the LCF process has been considered. The mechanics of the fatigue plastic deformation on the nano-, meso-, and microlevels and the processes that accompany this deformation have been studied.