本文選題：SA-鋼　切入點：大型鍛件　出處：《鍛壓技術(shù)》2017年08期

【摘要】：SA508-3鋼是目前大型核反應(yīng)堆壓力容器的主要材料,從材料成形角度提高SA508-3鋼大型鍛件整體性能從而提高零件安全性是大型鑄鍛件研究的重要方向。通過對傳統(tǒng)錐板鐓粗+平板旋轉(zhuǎn)展平工藝成形的SA508-3鋼大型鍛件的超聲波探傷密集型缺陷進行失效分析,得到缺陷為呈斷續(xù)鋸齒狀的裂紋缺陷,缺陷產(chǎn)生的原因與微觀偏析帶引起的金屬材料組織和性能不均有關(guān)。采用數(shù)值模擬方法,對傳統(tǒng)工藝與錐板鐓粗+胎模旋轉(zhuǎn)展平新工藝進行比較分析。結(jié)果表明,采用新工藝時,鍛件內(nèi)部金屬在三向壓應(yīng)力下發(fā)生大變形,可避免新裂紋產(chǎn)生,有利于已有閉合裂紋的焊合,鍛件組織更加均勻。實際生產(chǎn)過程中,該方法可有效減少SA508-3鋼大型鍛件中的密集型裂紋缺陷。
[Abstract]:SA508-3 steel is the main material of large nuclear reactor pressure vessel at present. It is an important direction to improve the integral properties of large SA508-3 steel forgings and improve the safety of parts from the point of view of material forming.Based on the failure analysis of the ultrasonic flaw intensive defects of the large SA508-3 steel forgings formed by the traditional plate upsetting rotary flattening process, the defects are found to be intermittent jagged cracks.The causes of defects are related to the uneven microstructure and properties of metallic materials caused by microsegregation bands.A numerical simulation method was used to compare and analyze the traditional technology and the new technology of rotating flattening of cone plate upsetting tire die.The results show that when the new process is adopted, the metal inside the forging will deform greatly under the triaxial compressive stress, which can avoid the occurrence of new cracks, which is beneficial to the welding of the existing closed cracks, and the structure of the forgings is more uniform.The method can effectively reduce the dense crack defects in SA508-3 steel forgings.
【作者單位】： 成都航空職業(yè)技術(shù)學院機電工程學院;重慶大學材料科學與工程學院;
【基金】：國家自然科學基金資助項目(51275543) 四川省教育廳科研資助項目(17ZB0035)
【分類號】：TG316;TM623.2

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