Core Viewpoint - GH4141 high-temperature alloy is recommended for applications in the 600–750°C range, showcasing a balance of strength and oxidation resistance [2][11]. Group 1: Material Properties - GH4141 has a room temperature ultimate tensile strength (UTS) of 1100 MPa and a yield strength of 950 MPa, with a tensile strength of 780 MPa at 650°C [2][3]. - The oxidation weight gain of GH4141 after 100 hours at 800°C is 0.35 mg/cm², which is between Inconel 718 (0.60 mg/cm²) and Haynes 230 (0.28 mg/cm²) [3][4]. Group 2: Microstructure Analysis - The microstructure of GH4141 features fine and uniform γ′ precipitates and carbide distribution, contributing to high-temperature creep resistance [4]. - The oxidation layer primarily consists of Cr2O3, which is attributed to the chromium content in GH4141, forming a dense oxide film at 800°C [4]. Group 3: Processing Techniques - There is a debate on whether GH4141 should adopt powder metallurgy (PM) combined with hot isostatic pressing (HIP) instead of traditional forging and aging processes [5]. - Proponents of the PM route argue it eliminates casting defects and improves uniformity, resulting in a 15% increase in fatigue life, albeit with a 30% increase in cost [5]. Group 4: Decision-Making Framework - For parts larger than 500 mm or geometrically complex and requiring low cost, traditional forging and aging should be prioritized [6]. - For fatigue or crack-sensitive small parts (less than 200 mm), PM and HIP should be considered to enhance density [6]. Group 5: Market and Cost Considerations - The current nickel price is approximately US$20,000 per ton on the LME and around ¥165,000 per ton on the Shanghai Metals Market, which directly impacts the production cost of GH4141 and the economic viability of the PM route [7]. Group 6: Common Misconceptions - A common misconception is to select materials solely based on room temperature strength, neglecting GH4141's high-temperature retention [8]. - Another error is equating GH4141 with Inconel 718, overlooking differences in chemical composition and oxidation behavior [9]. - It is also a misconception that PM is always superior to forging without considering cost, size, and post-processing requirements [10]. Group 7: Conclusion - GH4141 demonstrates balanced performance in high-temperature strength and overall properties, making it suitable for load-bearing components in the 600–750°C range [11]. - When selecting processing routes, it is essential to weigh cost, part type, and fatigue sensitivity, while avoiding common misconceptions to reduce design risks [11].