Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7982488 | Materials Science and Engineering: A | 2013 | 9 Pages |
Abstract
The mechanical stability of reversed austenite at room temperature in two 13%Cr-4%Ni low carbon martensitic stainless steel samples after different heat treatments has been investigated. The uniaxial tensile tests indicate that the reversed austenite resulting from the one-stage and two-stage intercritical tempering heat treatment have different mechanical stability, which induces distinct strength-ductility balance of the material. Experiments and crystal plasticity finite method simulations reveal that the special grain orientation relationship between the reversed austenite and martensite matrix, besides chemical composition, plays important roles on the mechanical stability of the reversed austenite. It is found that in both samples the Nishiyama-Wassermann or Kurdjumov-Sachs relationship between the reversed austenite and the martensite matrix provides an easy way for the active slip systems in austenite to penetrate the phase boundary to the adjacent martensite. This results in a high mechanical stability of the reversed austenite. In addition, the larger austenite grains in the second-stage tempering sample have higher mechanical stability in the martensitic steel due to the favored austenite stabilizing elements distribution behavior, and the favored stress distribution originating from the intrinsic strengths of the austenite and martensite matrix.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Pei Wang, Namin Xiao, Shanping Lu, Dianzhong Li, Yiyi Li,