Core Viewpoint - The 1J117 precision alloy demonstrates high strength and excellent dimensional stability, making it suitable for critical components in high-precision applications such as gears and positioning parts [1][4]. Mechanical Properties - The yield strength (σy) of 1J117 is approximately 1050–1250 MPa, and the tensile strength (σb) is around 1200–1500 MPa, providing reliable load-bearing capacity for key components [3]. - Elongation (δ) is about 12–18%, indicating moderate ductility, while hardness (HRC) ranges from 52 to 58, which is beneficial for fatigue life after high-precision machining [3]. - Fatigue limit under 2×10^6 cycles is approximately 450–600 MPa, influenced significantly by surface roughness and heat treatment [3]. - Thermal stability is maintained with strength reduction of less than 5% during short-term heat treatment at 350–500°C, ensuring good dimensional stability [3]. - The alloy exhibits stable wear and corrosion resistance due to the synergistic effects of chromium and nickel, with surface treatments enhancing actual lifespan [3]. Standards and Testing - The dual standard system of American and national standards enhances traceability in quality control during design and manufacturing processes [4]. - Mechanical performance testing follows ASTM E8/E8M and GB/T 228.1 standards, ensuring consistency in on-site inspection and factory release [5]. - Heat treatment and process specifications reference AMS 2700 and AMS 2750, ensuring traceability in temperature measurement [5]. Cost and Supply Chain Management - The use of mixed market data sources, such as LME for global price fluctuations of nickel and chromium, and Shanghai Nonferrous Metals Network for domestic pricing trends, aids in cost estimation and supply chain risk management [4][5]. - The comparison of these data sources helps in formulating robust procurement and production plans, mitigating risks associated with single-source price volatility [5]. Challenges and Considerations - There is ongoing debate regarding the trade-off between fatigue toughness and hardness in extreme high-temperature conditions, necessitating extensive comparative testing and microstructural analysis [5]. - Ignoring the impact of heat treatment and subsequent surface processing on mechanical properties can lead to fatigue or deformation risks during assembly and usage [5]. - A singular focus on strength metrics without considering ductility, processability, and thermal stability may compromise component reliability [5].