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Journal of Materials Engineering and Performance

, Volume 28, Issue 1, pp 308–320 | Cite as

A Systematic Study on the Dynamic Softening Behavior of a Heat-Resistant Alloy Considering Thermal and Microstructural Effects

  • Weicheng JiangEmail author
  • Li Ruihong
  • Fengzhi Wu
  • Ye Cheng
  • Hongying Wang
  • Zhigang Li
  • WanHui Liu
  • AiLian Bao
Article
  • 21 Downloads

Abstract

Deep understanding of the relationships among flow softening behaviors, microstructure evolution and process parameters is an essential issue due to the varied strain rate and temperature in industrial hot working schedules. In this research, substantial hot compression tests of a SNCrW heat-resistant alloy were conducted to quantitatively investigate the extrinsic dynamic flow softening behaviors and intrinsic grain size evolution. The thermal softening ratio (TSR) and microstructural softening ratio (MSR) were introduced to, respectively, characterize the degree of deformation heating-induced thermal softening and dynamic recrystallization-induced microstructural softening, respectively. To obtain more accurate results, the TSR was calculated with an improved algorithm that considered strain effects. Additionally, a 3D TSR map and MSR map of the SNCrW heat-resistant alloy were constructed to study the response relationships between thermal softening or microstructural softening and the deformation parameters. In addition, a superimposed contour map of the average grain size on the MSR map was developed to reveal the relationships between microstructural evolution and the macromechanical response. The results show that the grain size of the SNCrW heat-resistant alloy exhibits an inverse correlation with the MSR and is slightly correlated with thermal softening.

Keywords

deformation heating dynamic recrystallization grain size microstructural softening thermal softening 

Notes

Acknowledgement

This work was supported by the National Natural Science Foundation of China [grant numbers: 51609133].

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Copyright information

© ASM International 2018

Authors and Affiliations

  • Weicheng Jiang
    • 1
    • 2
    Email author
  • Li Ruihong
    • 1
  • Fengzhi Wu
    • 3
  • Ye Cheng
    • 2
  • Hongying Wang
    • 4
  • Zhigang Li
    • 5
  • WanHui Liu
    • 5
  • AiLian Bao
    • 5
  1. 1.Merchant Marine CollegeShanghai Maritime UniversityShanghaiChina
  2. 2.Institute of Marine Materials Science and EngineeringShanghai Maritime UniversityShanghaiChina
  3. 3.Natural Energy Course, Machinery Field, Faculty of EngineeringAshikaga Institute of TechnologyAshikagaJapan
  4. 4.School of Materials Science and EngineeringJiamusi UniversityJiamusiChina
  5. 5.Jiangsu Metalink Special Alloys CorporationNanjingChina

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