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表面機械滾壓對Zr-4合金組織和力學性能的影響
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金屬材料強度國家重點實驗室,金屬材料強度國家重點實驗室,金屬材料強度國家重點實驗室,金屬材料強度國家重點實驗室,金屬材料強度國家重點實驗室

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國家科學自然基金(51471129和51321003),973計劃課題(2014CB644003)


Effect of SMRT on Microstructure and Mechanical Properties of Zr-4 Alloy
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    摘要:

    采用表面機械滾壓對退火態(tài)Zr-4合金進行表面納米化處理并對其微觀組織和力學性能開展了系統(tǒng)研究。滾壓處理在Zr-4合金表面形成納米/超細晶及變形層的厚度與滾壓道次、每道次滾壓深度有關；對Zr-4合金優(yōu)化后的滾壓參數(shù)為每道次滾壓深度40μm、滾壓8道次，獲得表面到心部的納米晶、超細晶、變形組織和心部原始粗晶連續(xù)梯度變化的組織形貌，其納米/超細晶層的厚度約為100μm，變形層的厚度約為300μm。Zr-4合金經(jīng)滾壓處理后，表層顯微硬度顯著提高；屈服強度和抗拉強度分別為352MPa和600MPa，各提高了7%和9%，延伸率略有降低。用混合法則計算了Zr-4合金具表面滾壓處理后的屈服強度，與實驗值吻合。

    Abstract:

    The microstructure and mechanical properties of annealed Zr-4 alloy subjected to surface mechanical rolling treatment (SMRT) have been systematically investigated. The effect of rolling passes and rolling depth per pass on the thicknesses of NG (nano grain) / UFG (ultrafine grain) layer and deformed layer in SMRTed Zr-4 alloy are studied. The optimized process parameters are 8 passes and depth of 40 μm per pass. A gradient microstructure consisting of NG/UFG layer, deformed layer and CG layer are produced in the SMRTed Zr-4 alloy from the treated surface to the matrix with thicknesses of 100μm and 300μm. The microhardness on surface significantly increases due to SMRT. The yield stress and ultimate tensile strength of SMRTed Zr-4 alloy are 352MPa and 600MPa, increase by 7% and 9%, respectively. And the elongation is slightly reduced.The rule-of-mixture for strength can be used to estimate the combined strengths of Zr-4 alloy with a combination of NG/UFG layer, the deformed layer, and the CG matrix.

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辛超,徐巍,孫巧艷,肖林,孫軍.表面機械滾壓對Zr-4合金組織和力學性能的影響[J].稀有金屬材料與工程,2017,46(7):1954~1960.[Xin Chao, Xu Wei, Sun Qiaoyan, Xiao Lin, Sun Jun. Effect of SMRT on Microstructure and Mechanical Properties of Zr-4 Alloy[J]. Rare Metal Materials and Engineering,2017,46(7):1954~1960.]
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  • 收稿日期:2015-03-20
  • 最后修改日期:2015-04-13
  • 錄用日期:2015-05-13
  • 在線發(fā)布日期: 2017-11-14
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