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Effect of Tempering Temperature on Microstructure Evolution and Hardness of 9Cr1. 5Mo1CoB(FB2) Steel
Steel Research International ( IF 1.9 ) Pub Date : 2021-01-16 , DOI: 10.1002/srin.202000519
Yongqiang Zhang 1 , Chuanwei Li 1 , Gang Shen 2 , Lizhan Han 1 , Jianfeng Gu 1
Affiliation  

The microstructure evolution and hardness variation of FB2 steel influenced by tempering are investigated. The results show that water‐cooling from 1100 °C produces lathy martensite microstructure. After tempering at 500 °C, the steel exhibits a martensite structure with 4.2% needle‐like Fe3C particles. The (Cr, Mo)2C and Cr‐rich M7C3 particles are detected in the sample tempered at 570 °CAs the tempering temperature enhances from 620 to 700 °C the (Cr, Mo)2C and Cr‐rich M7C3 in the matrix are replaced by Cr‐rich M23C6. Besides, the (V, Nb)C particles are identified in samples tempered above 620 °C. Thus, the evolution of carbides in FB2 steel during tempering can be summarized as: Fe3C→(Cr, Mo)2C + Cr‐rich M7C3→(Cr, Mo)2C + Cr‐rich M7C3 + Cr‐rich M23C6→Cr‐rich M23C6. Furthermore, the results suggest that M3C, M2C + M7C3, M23C6, and MX have high reaction rates at 500, 570, 620, and 700 °C respectively. In addition, the dislocation density reduces from 6.8 × 1014 m−2 to 2.1 × 1014 m−2, and the volume fraction of carbides increases from 4.2% to 12.6% with increasing temperatures from 500 to 700 °C leading to hardness decrease from 485 to 284 Hv. Finally, the quantitative relationship between the hardness and microstructure evolution during tempering is discussed.

中文翻译:

回火温度对9Cr1组织演变和硬度的影响。5Mo1CoB(FB2)钢

研究了回火对FB2钢的组织演变和硬度变化的影响。结果表明,从1100°C开始水冷会产生马氏体板状显微组织。在500°C下回火后,该钢呈现出马氏体组织,其中有4.2%的针状Fe 3 C颗粒。的(铬,钼)2 C和铬富含M的7 Ç 3个在570℃的CA回火的样品中检测到的颗粒的回火温度提高620〜700℃(铬,钼)2 C和铬富含M的基质中的7 C 3被富铬的M 23 C 6取代。此外,在回火温度高于620°C的样品中鉴定出(V,Nb)C颗粒。因此,回火过程中FB2钢中碳化物的演变可总结为:Fe 3 C→(Cr,Mo)2 C + Cr富集的M 7 C 3 →(Cr,Mo)2 C + Cr富集的M 7 C 3  +富铬的M 23 C 6 →富铬的M 23 C 6。此外,结果表明M 3 C,M 2 C + M 7 C 3,M 23 C 6和MX分别在500、570、620和700°C下具有较高的反应速率。另外,随着温度从500升高到700°C ,位错密度从6.8×10 14  m -2减小到2.1×10 14  m -2,碳化物的体积分数从4.2%增加到12.6%,导致硬度降低从485到284高压 最后,讨论了回火过程中硬度与组织演变之间的定量关系。
更新日期:2021-01-16
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