This paper deals with the effects of rare earth (RE) addition on the microstructure and properties of 20Cr2Ni4A steel carburised at 860°C. Compared with conventional 920°C carburising and other complex treatments, finer and more dispersed carbide precipitates formed in the surface layers. A superfine martensitic structure and a less residual austenite were obtained by direct quenching after RE 860°C carburising. The microstructure exhibited a higher microhardness, a wear resistant surface layer, and it also led to an increase in impact toughness. In addition, the heat treatment period for this steel was remarkably reduced by the replacement of conventional complex treatments by RE 860°C carburising.
Get full access to this article
View all access options for this article.
References
1.
WEIR. D., LIUZ. R., and WANGC. Y.: Acta Metall. Sin. (China), 1983, 19, (5), 197–200.
2.
WEIY. D., LIUZ. R., WANGC. Y., CHENG., and CLIENGX. H.: J. Chin. Rare Earth Soc., 1986, 4, (1), 47–52.
3.
YANM. F. and LIUZ. R.: Proc. 1st Asian Conf. on ‘Heat treatment of materials’, Beijing, China, May 1998, 120-125; China Machine Press.
4.
YANM. F.: Mater. Chem. Phys., 2001, 70, 242–244.
5.
YANM. F. and LIUz. R.: Heat Treat. Met. (China), 1999, 24, 31–33.
6.
YANM. F., PANW., BELLT., and LIUZ. R.: Appl. Surf Sci., 2001, 173, 91–94.
7.
WANGD. Z.: ‘Mechanical behavior of metals’, chapter 7; 1993, Harbin, China, Harbin Institute of Technology Press (in Chinese).
ZHANGJ., CLEUGHD. P., BUCHHAGENP., LEEB., and SUNY.: Proc. 2nd Int. Conf. on ‘Surface engineering’, Wuhan, China, October 1999, 288-295; Journal of Materials Protection Publishing House.
10.
YANM. F., SUNY., BELLT., LIUZ. R., and XIAL. F.: Acta Metall. Sin. (China), 2000, 36, (5), 487–491.
