Nano-size Precipitates during Relaxation and Refinement of Bainite

YUAN Shao-qiang; ZHANG Xiao-juan; HAO Bin; ZHANG Ji-shan

doi:10.3788/OPE.20132108.1995

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Nano-size Precipitates during Relaxation and Refinement of Bainite

更新时间：2020-08-12

- Nano-size Precipitates during Relaxation and Refinement of Bainite
- Optics and Precision Engineering Vol. 21, Issue 8, Pages: 1995-1999(2013)
- 作者机构：
  
  1. 新金属材料国家重点实验室北京,100083
  2. 唐山学院&nbsp
  3. 机电工程系,河北唐山,063000
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20132108.1995
  CLC： TG113.25;TG142.33
- Received：16 January 2013，
  
  Revised：19 March 2013，
  
  Published Online：20 August 2013，
  
  Published：15 August 2013
- 稿件说明：
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苑少强张晓娟梁国俐. 弛豫过程中的纳米析出及贝氏体组织的细化[J]. 光学精密工程, 2013,21(8): 1995-1999

YUAN Shao-qiang ZHANG Xiao-juan HAO Bin ZHANG Ji-shan. Nano-size Precipitates during Relaxation and Refinement of Bainite[J]. Editorial Office of Optics and Precision Engineering, 2013,21(8): 1995-1999
苑少强张晓娟梁国俐. 弛豫过程中的纳米析出及贝氏体组织的细化[J]. 光学精密工程, 2013,21(8): 1995-1999 DOI： 10.3788/OPE.20132108.1995.

YUAN Shao-qiang ZHANG Xiao-juan HAO Bin ZHANG Ji-shan. Nano-size Precipitates during Relaxation and Refinement of Bainite[J]. Editorial Office of Optics and Precision Engineering, 2013,21(8): 1995-1999 DOI： 10.3788/OPE.20132108.1995.

摘要

合金钢变形过程中奥氏体区域内的位错演变行为与析出行为有着密切的关系。为了验证贝氏体细化结构与室温模拟的Fe-40Ni合金纳米级析出相钉扎位错网络结构的关联，本文采用热模拟、金相显微技术和透射电镜（TEM）显微术研究了低碳微合金钢变形后850℃弛豫过程中的析出行为及其对随后冷却过程中形成的贝氏体组织的影响。结果表明，实验用钢的微观组织结构（超细晶贝氏体及马氏体的混合物）在弛豫过程中可以得到有效细化，变形后在850 ℃弛豫60~200 s可以得到最佳的组织细化结果。同时，应变诱导析出的小于10 nm的析出相可以有效地钉扎住位错。实验结果与Fe-40Ni合金模拟结果一致。

Abstract

The evolution of dislocations in an austenitic region has a close relationship with the processing of precipitation during the alloy steel deformation. To verify the relevance of the refining structure of bainite and the pining dislocation networks of nano-size precipitation for Fe-40Ni alloy

the thermo-simulation test

metallographic analysis

quantitative measurement and transmission electron microscope (TEM) technique were used to study the precipitation of deformated low carbon microalloyed steel in relaxation processing at 850 ℃ and its influence on bainite formed during subsequent cooling. The experimental results demonstrate that the microstructures (mixed ultra-fine bainite and martensite) of the tested steel have been refined effectively during relaxation processing and it shows the optimum refinement can be obtained by 60-200 s relaxation after being deformed. Meanwhile

the dislocations can be pinned by the strain-induced precipitation whose sizes are less than 10 nm. The experimental results obtained from the tested steel are in a good agreement with that of the Fe-40Ni alloy simulations.

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references

ZHEN Q, WANG, X P, et al.. Strain-induced precipitation in a Ti micro-alloyed HSLA steel [J]. Materials Science and Engineering A, 2011, 52: 459-467.[2]WANG X M, HE X L, YANG SH W. Refining of intermediate transformation microstructure by relaxation processing [J]. ISIJ International, 2002,42 (12): 1553-1559.[3]YUAN S Q, YANG S W, NIE W J. Change in dislocation configuration of deformed Fe-Ni-Nb-Ti-C-B alloy during stress relaxation [J]. Journal of University of Science and Technology Beijing, 2003, 10(3): 76-78.[4]YUAN SH Q, YANG SH W, WANG X M. Over-relaxation effect of deformed austenite on ageing behavior of an Nb-bearing microalloyed steel [J]. Journal of University of Science and Technology Beijing, 2005, 12(3): 248-251.[5]RAINFORTH W M, BLACK M P, HIGGINSON R L. Precipitation of NbC in a model austenitic steel [J]. Acta Materialia, 2002, 50: 735-747.[6]苑少强,杨善武,聂文金,等.Fe-Ni-Nb-Ti-C合金变形后等温弛豫过程中位错与析出的相互作用[J].金属学报,2004,40(8)：887-890.YUAN SH Q, YANG SH W, NIE W J, et al.. Interaction between the dislocations and strain-induced precipitates during stress relaxation after deformation of Fe-Ni-Nb-Ti-C alloy [J]. Acta Metallurgica Sincia, 2004, 40(8): 887-890. (in Chinese)[7]YUAN SH Q, LIANG G L. Dissolving behavior of second particles in Nb-Ti microalloyed steel [J]. Materials Letters, 2009, 63: 2324-2326.[8]DUTTA B, SELLARS C M. Effect of composition and process variables on Nb(C,N) precipitation in Niobium microalloyed austenite [J]. Materials Science and Technology, 1987, 3(3): 197-206.

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