About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Joining/Bonding of Dissimilar Materials
|
| Presentation Title |
Performance of a Dissimilar Metal Weld Joint for Advanced Ultra-Supercritical Coal Power Plant Applications |
| Author(s) |
Valentin Pauly, Ling Wang, Michael Santella, Xiang (Frank) Chen |
| On-Site Speaker (Planned) |
Valentin Pauly |
| Abstract Scope |
Advanced ultra-supercritical (A-USC) coal power plants require materials capable of long-term performance at high steam temperatures and pressures necessary for increased efficiency. γ′-strengthened Haynes® 282® and Inconel® 740H® have been extensively studied for these applications, but the dissimilar metal weld (DMW) joining wrought 740H boiler piping to cast H282 turbine casings remains a rarely examined yet critical link in A-USC systems. Narrow-groove gas tungsten arc welding with H282 filler was used to fabricate 740H-H282 DMW with and without post-weld heat treatment (PWHT). Electron microscopy, microhardness measurements, and high-temperature tensile testing indicate that cast H282 is the weakest region of the weld assembly with and without PWHT as shown by its low hardness, tensile and yield strengths. γʹ coarsening in the weld deposit following PWHT increased its strength to levels comparable to 740H. These results enhance understanding and qualification of these joints for high-efficiency, coal-based power generation. |