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<p>This study investigates the effect of annealing conditions on the microstructural evolution and mechanical properties of brass/steel multilayered composites fabricated via accumulative roll bonding (ARB). Utilizing a cost-effective investigative method, tensile test specimens were encapsulated and subjected to annealing at designated temperatures (450&#xa0;°C, 550&#xa0;°C, and 650&#xa0;°C for 1 and 2&#xa0;h) to mitigate the effects of atmospheric contaminants during the process. The post-annealing treatment balanced these variations in mechanical properties. As the annealing temperature increased, recrystallization initiated and progressed within the Brass and steel layers, leading to grain growth and the formation of equiaxed grains. Annealing above 450&#xa0;°C and 550&#xa0;°C resulted in grain coarsening within the brass and steel layers. However, increasing the annealing condition also promoted the formation and expansion of a diffusion layer (with an average thickness of 3&#xa0;µm), which improved the bonding strength between the composite layers. The highest ultimate tensile strength (UTS) of 437.9&#xa0;MPa was achieved after annealing the seventh-pass sample at 450&#xa0;°C for 1&#xa0;h. Furthermore, the UTS of the seventh pass annealed at 650&#xa0;°C for 2 h exhibited a 61% reduction relative to non-annealed samples, whereas the elongation at break of the third pass under identical conditions demonstrated an enhancement of 793% when compared to the non-annealed counterpart. Meanwhile, the best elongation at break (60.2%) was recorded at 650&#xa0;°C for 2&#xa0;h in the first-pass sample. Fractographic analysis revealed a transition from brittle fracture in the as-ARB-processed samples to predominantly ductile fracture in the annealed ones.</p>

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Tailoring microstructure, fracture, and mechanical properties of brass/steel composites via strain accumulation and encapsulation annealing

  • 期刊论文

  • 发表日期：

    2025年8月15日

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  • Liwei Xin,
  • Xiaoling Shi,
  • Shoukang Hou,
  • Chunmao Zhang

摘要

This study investigates the effect of annealing conditions on the microstructural evolution and mechanical properties of brass/steel multilayered composites fabricated via accumulative roll bonding (ARB). Utilizing a cost-effective investigative method, tensile test specimens were encapsulated and subjected to annealing at designated temperatures (450 °C, 550 °C, and 650 °C for 1 and 2 h) to mitigate the effects of atmospheric contaminants during the process. The post-annealing treatment balanced these variations in mechanical properties. As the annealing temperature increased, recrystallization initiated and progressed within the Brass and steel layers, leading to grain growth and the formation of equiaxed grains. Annealing above 450 °C and 550 °C resulted in grain coarsening within the brass and steel layers. However, increasing the annealing condition also promoted the formation and expansion of a diffusion layer (with an average thickness of 3 µm), which improved the bonding strength between the composite layers. The highest ultimate tensile strength (UTS) of 437.9 MPa was achieved after annealing the seventh-pass sample at 450 °C for 1 h. Furthermore, the UTS of the seventh pass annealed at 650 °C for 2 h exhibited a 61% reduction relative to non-annealed samples, whereas the elongation at break of the third pass under identical conditions demonstrated an enhancement of 793% when compared to the non-annealed counterpart. Meanwhile, the best elongation at break (60.2%) was recorded at 650 °C for 2 h in the first-pass sample. Fractographic analysis revealed a transition from brittle fracture in the as-ARB-processed samples to predominantly ductile fracture in the annealed ones.