Strategies to increase austenite FCC relative phase stability in High-Mn steels

نویسندگان

چکیده

Several strategies to increase the FCC austenite stability compared BCC and HCP martensites have been tested are discussed. The relative of different phases was analyzed by studying effects of: a) grain size, b) antiferromagnetic ordering austenite, c) thermal cycling through FCC-HCP transition, d) plastic deformation e) combined effects. As a first step, effect decreasing size in Fe–Mn alloys for Mn contents smaller than 18 wt.%, where compete stability. Formation phase is inhibited 15 wt.% 17 sizes 2 μm. This enabled, time at these compositions, measurement Néel temperature using specific heat magnetic measurements. A comparison obtained transition temperatures with accepted models modifying on also showing complete inhibition 200 nm. nucleation model martensite considered which includes an additional resistance transformation term depending austenitic size. Additional stabilization discussed like interaction between introduction defects martensitic transformation. analysis can be easily applied systems larger number components. Results Fe–Mn–Cr system presented.

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

PHASE STABILITY AND SEMICONDUCTING BEHAVIOUR OF LOW ACTIVATION AUSTENITIC MN-CR STEELS

Four compositions of austenitic Mn-Cr steels have been developed successfully for in-vessel component materials in power plant industry. The phase stability of these Mn-Cr steels was studied by and X-ray diffraction (XRD) patterns. XRD patterns have shown that the matrix of these Mn-Cr steels is a single γ-phase structure. The potentiodynamic polarisation curves suggested that these fabricated ...

متن کامل

Coupling Binary and Ternary Information in Assessing the Fcc/Hcp Relative Phase Stability and Martensitic Transformation in Fe-Mn-Co and Fe-Mn-Si Alloys

This paper presents a study of the composition dependence of the fcchcp martensitic transformation temperatures and relative phase stability of these structures in Fe-Mn-Co and Fe-Mn-Si alloys. The approach combines new experimental determinations of M, and A, in the binary systems Fe-Mn and Fe-Co, and in both ternary systems with a critical analysis of the previously published experimental dat...

متن کامل

High Temperature Behavior of Dual Phase Steels

Dual phase steels with different martensite volume fraction and morphology were tensile tested at a temperature range of 25 to 5500C. Stress-strain curves of all steels showed serration flow at temperatures of 250 and 3500C, and smooth flow at the other temperatures. Both yield and ultimate tensile strengths increased with increasing testing temperature up to about 450<sup...

متن کامل

THE EFFECT OF STRAINING BEFORE AND DURING AUSTENITE TO FERRITE TRANSFORMATION ON THE FINAL CHARACTERISTICS OF SI-MN TRIP STEELS

TRIP (TRansformation- lnduced- Plasticity) behavior is a powerful mechanism to improve mechanical properties. The basis of TRIP phenomena is the transformation of retained austenite with optimum characteristics (volume fraction, stability, size and morphology) to martensite during deformation at room temperature. Accordingly, the first requirement to obtain desired TRIP effects is to produce an...

متن کامل

Microstructural control of the austenite stability in low-alloyed TRIP steels

We have performed in-situ magnetization and high-energy X-ray diffraction measurements on two aluminum-based TRIP steels from room temperature down to 100 K in order to evaluate amount and stability of the retained austenite for different heat treatment conditions. We have found that the bainitic holding temperature affects the initial fraction of retained austenite at room temperature but does...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Journal of Alloys and Compounds

سال: 2021

ISSN: ['0925-8388', '1873-4669']

DOI: https://doi.org/10.1016/j.jallcom.2020.156971