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Effect of cool deformation on mechanical properties and microstructure of Nb microalloyed steels.

機譯：冷變形對Nb微合金鋼力學(xué)性能和組織的影響。

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摘要

The improvements in mechanical properties of microalloyed steels result mainly from the refinement of ferrite grain size together with a controlled amount of precipitation strengthening. Applying small amounts of deformation, at very low hot working temperatures (e.g. coiling temperature), in the ferrite region (i.e. cool deformation) is found to improve strength and toughness by controlling the final microstructure of the steel. The main reason is thought to be the much finer and more uniformly dispersed precipitates in the steel matrix.;It has been found that these alloying elements respond very well to cool deformation, with the strength being highest in steels containing both Nb and Cu. However, there was also a cool deformation effect in the non Nb and Cu bearing steel. It was confirmed that precipitation plays a key role in the effect of cool deformation, with much of the precipitation taking place dynamically. However, static processes also seem to have a measurable effect on room temperature properties. Even low amounts of copper (e.g. ∼0.4 wt%) can contribute to strengthening of the steel. The Cu addition is found to affect the mechanical properties by affecting the precipitation and growth of Nb compounds. However, it was not possible to analyze the composition of the very small precipitates (below 10nm), and it cannot be discounted that some Cu and Ti bearing precipitation was also occurring during cool deformation.;In the present study, the effects of Nb and Cu on mechanical properties and corresponding microstructures in steels with different levels of cool deformation are investigated. The mechanical properties of the samples were determined with shear punch testing and the microstructure was examined by scanning and transmission electron microscopy. Thermodynamics simulations with FactSage were done to further analyze the possibility of precipitation of different elements.
機譯：微合金鋼機械性能的改善主要歸因于鐵素體晶粒尺寸的細化以及可控的析出強化量。發(fā)現(xiàn)在非常低的熱加工溫度（例如卷取溫度）下在鐵素體區(qū)域中施加少量變形（即冷變形）通過控制鋼的最終微觀結(jié)構(gòu)來改善強度和韌性。人們認為主要原因是鋼基質(zhì)中的析出物更細，分散得更均勻。已發(fā)現(xiàn)，這些合金元素對冷變形反應(yīng)非常好，在同時含有Nb和Cu的鋼中強度最高。但是，在非Nb和Cu軸承鋼中也有冷變形效應(yīng)。已經(jīng)證實，降水在冷變形的影響中起關(guān)鍵作用，其中大部分降水是動態(tài)發(fā)生的。但是，靜態(tài)過程似乎也對室溫特性具有可測量的影響。即使少量的銅（例如?0.4wt％）也可以有助于鋼的增強。發(fā)現(xiàn)添加銅會通過影響Nb化合物的沉淀和生長來影響機械性能。但是，不可能分析非常小的析出物（10nm以下）的組成，并且不能忽視的是在冷變形過程中也會出現(xiàn)一些含Cu和Ti的析出物。研究了Cu對不同冷變形水平的鋼的力學(xué)性能和相應(yīng)的顯微組織的影響。樣品的機械性能通過剪切沖頭測試確定，并且通過掃描和透射電子顯微鏡檢查微觀結(jié)構(gòu)。用FactSage進行熱力學(xué)模擬，以進一步分析不同元素沉淀的可能性。

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  • 作者

    Fatehi, Arya.;

  • 作者單位

    McGill University (Canada).;

  • 授予單位 McGill University (Canada).;
  • 學(xué)科 Engineering Metallurgy.;Engineering Materials Science.
  • 學(xué)位 M.Eng.
  • 年度 2008
  • 頁碼 104 p.
  • 總頁數(shù) 104
  • 原文格式 PDF
  • 正文語種 eng
  • 中圖分類
  • 關(guān)鍵詞

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