Influential Factors on Diffusion Bonding Strength as Demonstrated by Bonded Multi-Layered Stainless Steel 316L and
Da-Wei Liu1, Chun-Nan Lin2, Wei-Shuai Lin1
1Department of Mechanical Engineering, National Central University, Taoyuan City 32001, Taiwan.
Materials (Basel, Switzerland)
|August 10, 2024
Summary
Optimized diffusion bonding parameters for multi-layered stainless steel 316L and 430 stacks were identified. The study found optimal conditions for creating strong, cost-effective stainless steel cores for compact heat exchangers.
Area of Science:
- Materials Science
- Mechanical Engineering
- Manufacturing Processes
Background:
- Diffusion bonding is a critical process for fabricating multi-layered metal components.
- Optimizing bonding parameters is essential for achieving desired material properties and joint integrity.
- Stainless steel 316L and 430 are widely used in various industrial applications, including heat exchangers.
Purpose of the Study:
- To optimize diffusion bonding parameters for multi-layered stainless steel 316L and 430 stacks.
- To investigate the effect of bonding temperature, time, and pressure on the tensile strength of the bonding zone.
- To determine the suitability of diffusion bonding for producing stainless steel cores in compact heat exchangers.
Main Methods:
- Fabrication of twelve-layer stainless steel plates (55 mm × 55 mm × 3 mm and 100 mm × 50 mm × 3 mm).
- Diffusion bonding under varying conditions: temperature (1000–1048 °C), time (15–60 min), pressure (10–25.3 MPa), in a vacuum environment.
- Evaluation of bonding response through multi-axial tensile strength tests.
Main Results:
- Optimized diffusion bonding parameters (Condition G2C: 1048 °C/25.3 MPa/15 min) were identified.
- High tensile strength was achieved, comparable to monolithic specimens.
- Stainless Steel 430 exhibited a higher compression creep rate than Stainless Steel 316L, but compressibility did not impact bonding strength.
Conclusions:
- The optimized diffusion bonding parameters are suitable for producing SS316L stainless steel cores for compact heat exchangers.
- Diffusion bonding offers superior bonding quality and potential cost reductions in heat exchanger manufacturing.
- The study demonstrates the practical applicability of optimized diffusion bonding for industrial applications.
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