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多組織因素對GH4738合金裂紋擴展速率的交互影響
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-10-26
提出了一種可以綜合反映多組織因素對GH4738合金疲勞裂紋擴展速率影響的多組織因素交互影響方程，并利用不同的熱處理制度設計了具有不同組織特征的試樣。測定了經不同熱處理制度后GH4738合金在650℃下的疲勞裂紋擴展速率。利用該方程分析了GH4738合金晶粒尺寸、碳化物及γ＇相對疲勞裂紋擴展速率的影響。
多組織因素對GH4738合金裂紋擴展速率的交互影響INFLUENCE OF MULTI-MICROSTRUCTURE INTERACTION ON?FATIGUE CRACK GROWTH RATE OF GH4738 ALLOY
提出了一種可以綜合反映多組織因素對GH4738 合金疲勞裂紋擴展速率影響的多組織因素交互影響方程，并利用不同的熱處理制度設計了具有不同組織特征的試樣。測定了經不同熱處理制度后GH4738 合金在650℃下的疲勞裂紋擴展速率。利用該方程分析了GH4738合金晶粒尺寸、碳化物及γ＇相對疲勞裂紋擴展速率的影響。結果表明，多組織因素交互影響方程能很好地定量描述各組織因素對GH4738合金疲勞裂紋擴展速率的影響及其綜合影響。增大晶粒尺寸、降低γ＇相及碳化物尺寸均可降低 GH4738合金疲勞裂紋擴展速率，并且晶粒尺寸對 GH4738合金的裂紋擴展速率的影響程度要高于 γ＇相尺寸及碳化物。
The effects of microstructure on the fatigue crack growth behavior of hard-to-deformed GH4738?superalloy have been studied by a number of researchers. But most of these studies are confined to a single factor,?such as the effect of grain size on the fatigue crack growth rate. The studies only show the effect of single factor?which do not reflect the combined impacts of multi- microstructure factors. There is a need to develop quantitative?approach to predict the effects of multi-microstructure on fatigue crack growth behavior in the high?damage-tolerant microstructure design of GH4738 alloy. Therefore, A new multi-microstructure factors interaction?equation is proposed for the prediction of the effects of grain size、γ＇size and carbide size on fatigue crack growth?rate of GH4738 alloy in this paper. Different microstructures of GH4738 alloys are produced by different heat?treatments (HT) for this equation. The fatigue crack growth experiments are carried out under constant stress?ranges on compact tension (CT) specimens at 650℃ in air. It then analyzed the effects of grain size, gamma?prime size and grain boundary carbides size on the fatigue crack growth rate of GH4738 alloy by using the?multi-microstructure factors interaction equation. The results show that the equation can well predict the fatigue?crack growth rate of GH4738 alloy under different microstructure. Increasing grain size and reducing γ’ size,?carbides size can decrease the fatigue crack growth rate of GH438. The impact of grain size on fatigue crack?growth rate is more noticeable than that of γ’ and?carbide size.
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