表面硬化处理对Zr-4合金高温蠕变行为的影响规律

doi:10.13251/j.issn.0254-6051.2026.02.001

摘要/Abstract

摘要： 通过表面机械滚压技术在Zr-4合金表面引入了厚度约为280 μm的表面硬化层,进行了原始Zr-4合金与表面机械滚压Zr-4合金在360 ℃/50 MPa、360 ℃/85 MPa、360 ℃/125 MPa以及460 ℃/85 MPa下的120 h蠕变试验,研究了表面硬化层对Zr-4合金高温蠕变行为的影响规律,分析了蠕变后Zr-4合金表面硬化层的组织演变。结果表明:表面滚压硬化处理形成的表面硬化层对Zr-4合金360 ℃高温蠕变性能的提升作用微弱,降低了360 ℃/85 MPa的稳态蠕变速率,表面硬化处理Zr-4合金的蠕变总应变量与原始态合金相当;当蠕变温度升高到460 ℃时,表面硬化处理Zr-4合金的稳态蠕变速率和蠕变总应变量均高于原始合金,表明表面硬化处理降低了Zr-4合金的蠕变性能,主要原因是表面硬化层具有高的几何必需位错密度,促进了高温蠕变变形。在高温蠕变过程中少量的表层变形晶粒发生了再结晶,随着蠕变温度升高,再结晶晶粒占比增加。

关键词: Zr-4合金, 表面滚压硬化, 蠕变行为, 再结晶

Abstract: A surface hardened layer with a thickness of approximately 280 μm was introduced onto the Zr-4 alloy by using surface mechanical rolling treatment. The as-received Zr-4 alloy and the surface mechanical rolled Zr-4 alloy were subjected to creep experiments at 360 ℃/50 MPa, 360 ℃/85 MPa, 360 ℃/125 MPa, and 460 ℃/85 MPa for 120 h. The effect of the surface hardening layer on the high-temperature creep of the Zr-4 alloy and the microstructure evolution of the hardened layer were systematically investigated. The results show that the surface hardening treatment by surface rolling forms a surface hardened layer, which has a weak effect on improving the creep properties of Zr-4 alloy at 360 ℃, it reduces the steady-state creep rate at 360 ℃/85 MPa, the total creep strain of the surface hardened Zr-4 alloy is comparable to that of the as-received. When the creep temperature rises to 460 ℃, the steady-state creep rate and total creep strain of the surface hardened Zr-4 alloy are both higher than those of the as-received, which indicates that the surface hardening treatment reduces the creep property of Zr-4 alloy. The main reason is that the surface hardened layer has a high geometrically necessary dislocation density, which promotes high-temperature creep deformation. During the high-temperature creep process, a small amount of deformed grains in the hardened layer undergo recrystallization and the proportion of recrystallized grains increases as creep temperature raises.

Key words: Zr-4 alloy, surface mechanical rolling hardening, creep behavior, recrystallization

中图分类号:

TG146.4⁺1

王博康, 耿东晖, 霍尚乐, 孙巧艳. 表面硬化处理对Zr-4合金高温蠕变行为的影响规律[J]. 金属热处理, 2026, 51(2): 1-10.

Wang Bokang, Geng Donghui, Huo Shangle, Sun Qiaoyan. Effect of surface hardening on high-temperature creep behavior of Zr-4 alloy[J]. Heat Treatment of Metals, 2026, 51(2): 1-10.

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