| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Advanced Steel Metallurgy
|
| Presentation Title |
Effect of Coiling and Annealing Temperature on Nb precipitation, Microstructure and Mechanical Properties of HSLA |
| Author(s) |
Lei Cui, Wenjun Wang, Deshun Chen, Yonggang Liu |
| On-Site Speaker (Planned) |
Lei Cui |
| Abstract Scope |
High Strength Low Alloyed(HSLA) steel has found its worldwide use in multiple industries such as automobile, oil and gas. Nb is usually introduced in the automotive HSLA grade with yield strength exceeding 300MPa. However, variation of yield strength tends to increase as Nb addition is above than 0.04%. To address this scattering, dual micro-alloying strategy with Nb and Ti was applied on galvanized HS420LA grade. The effect of annealing and coiling temperatures on microstructure and precipitation of Nb-rich particles were systematically studied using optical microscope, scanning electron microscope and transmission electron microscopy. Mechanical properties of the Nb+Ti micro-alloyed HSLA420 were compared with that of the Nb-alloyed counterpart. Optimized process with appropriate annealing and coiling temperature results in a significant narrowing of single-coil variation in yield strength, the ratio of steel coil yield strength variation above 20 MPa from 28.7% to 1.5% based on industrial production data |