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Thermal Stability of Retained Austenite and Properties of A Multi-Phase Low Alloy Steel
| Content Provider | MDPI |
|---|---|
| Author | Xie, Zhenjia Xiong, Lin Han, Gang Wang, Xuelin Shang, Chengjia |
| Copyright Year | 2018 |
| Description | In this work, we elucidate the effects of tempering on the microstructure and properties in a low carbon low alloy steel, with particular emphasis on the thermal stability of retained austenite during high-temperature tempering at 500–700 °C for 1 h. Volume fraction of ~14% of retained austenite was obtained in the studied steel by two-step intercritical heat treatment. Results from transmission electron microscopy (TEM) and X-ray diffraction (XRD) indicated that retained austenite had high thermal stability when tempering at 500 and 600 °C for 1 h. The volume fraction was ~11–12%, the length and width remained ~0.77 and 0.21 μm, and concentration of Mn and Ni in retained austenite remained ~6.2–6.6 and ~1.6 wt %, respectively. However, when tempering at 700 °C for 1 h, the volume fraction of retained austenite was decreased largely to ~8%. The underlying reason could be attributed to the growth of austenite during high-temperature holding, leading to a depletion of alloy contents and a decrease in stability. Moreover, for samples tempered at 700 °C for 1 h, retained austenite rapidly transformed into martensite at a strain of 2–10%, and a dramatic increase in work hardening was observed. This indicated that the mechanical stability of retained austenite decreased. |
| Starting Page | 807 |
| e-ISSN | 20754701 |
| DOI | 10.3390/met8100807 |
| Journal | Metals |
| Issue Number | 10 |
| Volume Number | 8 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2018-10-09 |
| Access Restriction | Open |
| Subject Keyword | Metals Manufacturing Engineering Thermal Stability Retained Austenite Multi-phase Microstructure Low Alloy Steel |
| Content Type | Text |
| Resource Type | Article |
