论文信息 - LOW-TEMPERATURE AUTOFRETTAGE: AN IMPROVED TECHNIQUE TO ENHANCE THE FATIGUE RESISTANCE OF THICK-WALLED TUBES AGAINST PULSATING INTERNAL PRESSURE

LOW-TEMPERATURE AUTOFRETTAGE: AN IMPROVED TECHNIQUE TO ENHANCE THE FATIGUE RESISTANCE OF THICK-WALLED TUBES AGAINST PULSATING INTERNAL PRESSURE

Abstract— It is shown that autofrettage at low temperatures is superior to autofrettage at room temperature in enhancing the fatigue resistance of thick-walled tubes against pulsating internal pressure. The physical reason is based on the well-known temperature dependence of the mechanical behaviour of metals and alloys which generally exhibit an enhancement of both the yield stress and strain hardening behaviour at lower temperatures. As a consequence, significantly larger compressive residual hoop stresses can be introduced during pressurization at low temperatures than at room temperature. Experimental data obtained on thick-walled tubes of the metastable austenitic stainless steel AISI 304 L which were subjected to pulsating internal pressure at room temperature after autofrettage at temperatures between-110°C and room temperature are presented. These data demonstrate convincingly the advantages offered by low-temperature autofrettage in enhancing both the fatigue life in the finite-life region and the fatigue endurance limit in comparison with autofrettage at room temperature. In conclusion, some specific materials requirements for optimum low-temperature autofrettage performance are discussed.

[1] Eckard Macherauch,et al. Das Verhalten metallischer Werkstoffe unter mechanischer Beanspruchung , 1978 .

[2] A. Seeger. The temperature dependence of the critical shear stress and of work-hardening of metal crystals , 1954 .

[3] H. Mughrabi,et al. Improvement of the strength of a metastable austenitic stainless steel by cyclic deformation-induced martensitic transformation at 103 K , 1992 .

[4] A. Abel,et al. The bauschinger effect and stacking fault energy , 1973 .

[5] David J. Smith,et al. High-resolution images of bent crystals having rutile-type structures: Tin dioxide , 1982 .

[6] H. Mughrabi,et al. Finite-element modelling of low-temperature autofrettage of thick-walled tubes of the austenitic stainless steel AISI 304 L: Part I. Smooth thick-walled tubes , 1998 .

[7] C. Laird,et al. Cyclic stress-strain response of F.C.C. metals and alloys—I Phenomenological experiments , 1967 .

[8] A. Cottrell,et al. Effects of temperature on the plastic properties of aluminium crystals , 1955, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[9] G. Vetter,et al. Fatigue of thick‐walled pipes from soft martensitic and semi‐austenitic chrome‐nickel steels under pulsating internal pressure , 1992 .