By J. Gerhold (auth.), U. Balu Balachandran, K. Ted Hartwig, Donald U. Gubser, Victoria A. Bardos (eds.)
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Extra resources for Advances in Cryogenic Engineering Materials : Volume 46, Part A
Met, 24:947 (1967). 8. Ya. Georgieva. Transformation - induced plasticity steels - a new class of high - strength steels with increased plasticity, Metalloved. 3 (1976), pp. 18-26. 9. Y. Rigo, F. Lecroisey and T. Mori, Relation between applied stress and orientation relationship of u-- martensite in stainless steel single crystal, Acta. , 22:313 (1974). 10. G. Stone and G. Thomas. Deformation induced alpha and epsilon martensites in Fe-NiCr single crystals, Mat. Trans. 5:2095 (1974). 27 CEC/ICMC Plenary Speakers (I to r) Juergen Gerhold, Robert Richardson, and Kenneth Johnson DEPENDENCE OF THE TEMPERATURE OF THE MARTENSITIC TRANSFORMATION ONSET UPON THE YIELD STRENGTH OF AUSTENITE M.
Fe-18Cr-8Ni; 2, Fe-18Cr-IONi; 0, this study; x, Ref. 10; +, Ref. II. Fe-Cr-Ni alloys; unfortunately, the results are not given, but they follow from Ref. 11 to be within 30 MPa to 50 MPa. The Ms values calculated from the dependences proposed before Ref. 10 appeared are considerably higher than in this study, as expected from the viewpoint of Eq. (6). 2) are shown in Figure 2 for the Fe-JSCr-SNi and Fe-lSCr-IONi alloys. 2 values resulted from the different thermal treatments of the initial alloys.
The ductile crack propagation is suppressed around the crevice and it results in making the crack front shape irregular. This is the reason of the invalid J according to ASTM E813-89. After the cryogenic test, the specimen was heated and fatigued at room temperature. e. the crack propagation near the crevice is slower as well as near the surface of specimen. From these facts, it is considered that the crevice formed at cryogenic temperature and it existed already when the fracture toughness test was carried out.