Persistent Precipitation Phase Transformation of S30432 Steeel at 650 ℃ and Its Effect on Material Property

Wang Longfei; Yang Peng; Wu Junjie; Shen Hongying; Wang Hao; Zhang Yanyan; Cai Xiayan

doi:10.20057/j.1003-8620.2025-00118

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Persistent Precipitation Phase Transformation of S30432 Steeel at 650 ℃ and Its Effect on Material Property

Application and Service | 更新时间：2026-03-03

- Persistent Precipitation Phase Transformation of S30432 Steeel at 650 ℃ and Its Effect on Material Property
- Special Steel Vol. 47, Issue 2, Pages: 140-146(2026)
- 作者机构：
  
  浙江久立特材科技股份有限公司研究院，湖州 313028
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.2025-00118
  CLC： TG142.1
- Received：25 April 2025，
  
  Published：30 March 2026
- 稿件说明：
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王龙飞,杨鹏,吴俊洁等.S30432钢650 ℃持久析出相变化及其对性能的影响[J].特殊钢,2026,47(02):140-146.

Wang Longfei,Yang Peng,Wu Junjie,et al.Persistent Precipitation Phase Transformation of S30432 Steeel at 650 ℃ and Its Effect on Material Property[J].Special Steel,2026,47(02):140-146.
王龙飞,杨鹏,吴俊洁等.S30432钢650 ℃持久析出相变化及其对性能的影响[J].特殊钢,2026,47(02):140-146. DOI： 10.20057/j.1003-8620.2025-00118.

Wang Longfei,Yang Peng,Wu Junjie,et al.Persistent Precipitation Phase Transformation of S30432 Steeel at 650 ℃ and Its Effect on Material Property[J].Special Steel,2026,47(02):140-146. DOI： 10.20057/j.1003-8620.2025-00118.

摘要

采用扫描电子显微镜（SEM）、电子背散射衍射（EBSD）及透射电子显微镜（TEM）等分析方法，结合Thermo-Calc热力学模拟计算结果，系统研究了S30432钢650 ℃持久后析出相的演变规律及其对材料持久塑性的作用机制。结果表明，S30432钢650 ℃持久后基体中存在大尺寸Nb（C，N）相，高应力下易开裂形成裂纹源；且随着持久时间逐渐增加，晶界及孪晶界析出相M

连续分布且明显粗化，易形成孔洞；在650 ℃、9 146~24 432 h条件下，晶界处生成块状σ相，σ相数量随着持久时间延长而增加并伴随显著粗化现象，促进微孔形核，加速了沿晶裂纹的萌生与扩展进程。这些高温持久过程中析出相的变化均对S30432钢650 ℃持久塑性的降低产生重要影响。

Abstract

The persistent precipitation phase transformation of S30432 steel after 650 ℃ creep and its effect mechanism on the material's creep ductility were systematically investigated by using analytical methods such as scanning electron micro

scopy （SEM）， electron backscatter diffraction （EBSD）， and transmission electron microscopy （TEM）， in combination with the results of thermodynamic simulation calculations using Thermo-Calc. Results show that：after 650°C creep， large-sized Nb（C，N） phases exists in the matrix of S30432 steel， which are prone to cracking and forming crack sources under high stress. With the increase of creep time， the precipitates phase M

at grain boundaries and twin boundaries continuously distribute and significantly coarsen， which is conducive to the formation of voids. At 650 ℃and 9 146 h-24 432 h， blockyσphase is generated at the grain boundary. The number of σ phase increases with the prolongation of creep time， accompanied by significant coarsening phenomenon， which promotes the nucleation of micropores and accelerates the germination and propagation of the crack along the grain.The changes in the precipitated phases during these high-temperature long-term processes all have an important impact on the reduction of the creep ductility of S30432 steel at 650°C.

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references

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