Strain induced martensite formation and its effect on strain hardening behavior in the cold drawn 304 austenitic stainless steels

Abstract SIM in the present cold drawn austenitic stainless steels, AISI 304 and AISI 304/Cu, nucleates mainly at the intersections of the mechanical twins rather than e-martensite. The present results are attributed to the suppression of the formation of e-martensite due to the increase of stacking fault energy which arise from the heat generated during high speed drawing and, for AISI 304/Cu, the additional effect of Cu additions. The strain hardening behavior of the present steels is strongly related to the microstructural evolution accompanied by SIM transformation: mechanical twinning at small strains, the formation and the growth of α′-martensite at intermediate strains, and plastic deformation and concurrent dynamic recovery in SIM at large strains.

[1]  L. Murr,et al.  Effects of Strain State and Strain Rate on Deformation-Induced Transformation in 304 Stainless Steel: Part II. Microstructural Study , 1982 .

[2]  Morris Cohen,et al.  Criterion for the action of applied stress in the martensitic transformation , 1953 .

[3]  T. Angel,et al.  Formation of Martensite in Austenitic Stainless Steels , 1954 .

[4]  H. Fujita,et al.  In-situ observation of strain-induced γ→ε→α' and γ→α' martensitic transformations in Fe-Cr-Ni alloys , 1992 .

[5]  G. Krauss,et al.  Martensite formation, strain rate sensitivity, and deformation behavior of type 304 stainless steel sheet , 1989 .

[6]  L. Murr,et al.  Nucleation and evolution of strain-induced martensitic (b.c.c.) embryos and substructure in stainless steel: A transmission electron microscope study , 1983 .

[7]  Woo-sik Kim,et al.  Effect of aluminium on deformation mode and mechanical properties of austenitic FeMnCrAlC alloys , 1995 .

[8]  G. Thomas,et al.  Structure and properties of thermal-mechanically treated 304 stainless steel , 1970 .

[9]  J. Venables.  The nucleation and propagation of deformation twins , 1964 .

[10]  W. Dahl,et al.  Strain hardening and transformation mechanism of deformation-induced martensite transformation in metastable austenitic stainless steels , 1991 .

[11]  S. Varma,et al.  Effect of grain size on deformation-induced martensite formation in 304 and 316 stainless steels during room temperature tensile testing , 1994 .

[12]  Siegfried S. Hecker,et al.  Effects of Strain State and Strain Rate on Deformation-Induced Transformation in 304 Stainless Steel: Part I. Magnetic Measurements and Mechanical Behavior , 1982 .

[13]  Hisashi Yamamoto,et al.  On the Development of Deformation and Transformation Textures during Cold Drawing in Austenitic Stainless Steels , 1984 .

[14]  J. Chang,et al.  Deformation microstructures and the shear strain rate of type 304 stainless steel sheet in cylindrical deep drawing of warm working , 1995 .

[15]  G. Thomas,et al.  The martensite phases in 304 stainless steel , 1970 .

[16]  Gregory B Olson,et al.  Kinetics of strain-induced martensitic nucleation , 1975 .

[17]  L. Murr,et al.  Deformation-induced martensitic characteristics in 304 and 316 stainless steels during room-temperature rolling , 1995 .

[18]  T. Narutani.  Effect of Deformation-Induced Martensitic Transformation on the Plastic Behavior of Metastable Austenitic Stainless Steel , 1989 .