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經濟型雙相不銹鋼2101中氮化物在基體中的平衡固溶度計算

Equilibrium solid solubility of nitrides in the matrix of lean duplex stainless steel 2101

  • 摘要: 為了解析出物對經濟型雙相不銹鋼2101熱塑性的影響機制,對比了相同工藝下2101和2205雙相不銹鋼在熱變形過程中相界析出物產生的規律.結果表明:2101鋼比2205鋼的相界處更傾向于產生析出物,促使后續熱變形過程中相界產生裂紋,進而影響材料的熱塑性.根據熱力學相關數據,通過Thermo-Calc和實驗測試數據,推導出2101和2205雙相不銹鋼析出物Cr2N的平衡固溶度公式,計算實驗鋼中析出物Cr2N的全固溶溫度,同時引入Wagner相互作用系數,考慮了Ni、Mn、Mo和Si對固溶度積公式的影響.發現2101雙相不銹鋼中Cr2N的全固溶溫度比2205鋼高100℃左右,計算結果和實驗結果吻合較好.實際生產過程中必須控制雙相不銹鋼熱軋的終軋溫度到全固溶溫度以上,否則相界容易產生氮化物析出,影響材料熱塑性.

     

    Abstract: In order to improve the thermoplasticity of lean duplex stainless steel, the precipitation law and mechanism of lean duplex stainless steel 2101 (LDX2101) and duplex stainless steel 2205 (DSS2205) were studied in hot rolling. It is found that LDX2101 is susceptible to nitride precipitation at phase boundaries compared with DSS2205, which causes microcracks and results in the thermoplasticity of specimens worsen. According to relevant thermodynamic data, the equilibrium solid solubility formulas of Cr2N precipitation in LDX2101 and DSS2205 were deduced, and total solid solution temperatures of Cr2N precipitation were calculated through Thermo-Calc software and experimental data. Meanwhile, the Wagner interaction coefficient was introduced to consider the influence of Ni, Mn, Mo and Si on the equilibrium solid solubility product formula. The results show that the total solid solution temperature of Cr2N precipitation in LDX2101 is around 100 ℃ higher than that in DSS2205. The calculation results and experimental results are in good agreement. The finishing hot roiling temperature must be above the total solid solution temperature in the practical production process to prevent Cr2N precipitation. Otherwise, the nitride precipitation is prone to produce at phase boundaries, which influences the thermoplasticity of the materials.

     

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