Abstract
Low-carbon, ferritic, precipitation-strengthened steels are being investigated seeking ever-increasing yield strengths with high impact fracture toughness properties at room temperature and -40°C. Low carbon steels containing Cu, Ni, and Al, as well as NbC for grain refinement, achieve yield strengths near 1000 MPa when solution treated and aged to obtain precipitation hardening. When quenched from 900°C, the matrix is ferritic with no evidence for martensite. The composition distributions within nanometer diameter precipitates formed on aging at 500°C are measured employing three-dimensional atom-probe (3DAP) microscopy. At an aging time of 3 hrs (underaged condition) the Cu-rich precipitates are less than 2 nm in diameter and contain significant amounts of Ni, Al and Fe. Spatially isolated Ni, Al precipitates have not been detected.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 525-530 |
| Number of pages | 6 |
| Journal | Materials Science and Technology |
| Volume | 1 |
| State | Published - Dec 1 2004 |
| Event | Materials Science and Technology, MS and T 2004; Volume 1: AIST Process Metallurgy, Product Quality and Applications Proceedings - New Orleans, LA, United States Duration: Sep 26 2004 → Sep 29 2004 |
Keywords
- 3-dimensional atom-probe (3DAP) microscopy
- Fracture toughness
- High-strength steel
- Nano-precipitates
ASJC Scopus subject areas
- Engineering(all)