發(fā)布時間：2019-04-24 05:54

【摘要】：SKD11冷作模具熱處理后經(jīng)磨削加工入庫放置時檢查一側(cè)表面發(fā)現(xiàn)裂紋。通過直讀光譜儀、硬度計、金相顯微鏡、電子探針分別對模具化學(xué)成分、硬度、夾雜物以及金相組織進(jìn)行檢測分析。結(jié)果表明:原始顯微組織不均勻、條帶狀成分偏析嚴(yán)重,晶粒粗大、晶界寬化的過熱傾向以及殘留奧氏體多回火不足等因素,造成馬氏體轉(zhuǎn)變時淬火殘余應(yīng)力過大,在淬火過程中及后續(xù)的模具放置應(yīng)力釋放過程中,內(nèi)應(yīng)力最終超過材料的強(qiáng)度極限,導(dǎo)致SKD11冷作模具表面裂紋的加速形成及縱深擴(kuò)展。
[Abstract]:After heat treatment of SKD11 cold-working die, cracks were found on one side of the surface after grinding and placing in storage. The chemical composition, hardness, inclusion and metallographic structure of the mould were examined by direct reading spectrometer, hardness tester, metallographic microscope and electron probe. The results show that the original microstructure is not uniform, the banded composition segregation is serious, the grain size is coarse, the grain boundary widening overheat tendency and the residual austenite multi-tempering deficiency and so on, which cause the quenching residual stress to be too large during martensitic transformation. During quenching and subsequent stress release of die placement, the internal stress finally exceeds the strength limit of the material, which leads to the acceleration of surface crack formation and longitudinal propagation of SKD11 cold-working die.
【作者單位】： 華南理工大學(xué)分析測試中心;華南理工大學(xué)材料科學(xué)與工程學(xué)院;
【基金】：國家自然科學(xué)基金(51471071) 廣東省工業(yè)科技攻關(guān)計劃項(xiàng)目(2013B010403008)
【分類號】：TG142.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前4條

1 黃志濤;田文懷;李春華;王建平;鎖紅波;;碳化物形態(tài)及回火時間對Cr12MoV鋼熱處理畸變的影響[J];金屬熱處理;2016年11期

2 潘詩良;;幾例模具失效的剖析[J];金屬熱處理;2015年08期

3 金q食，

本文編號：2464158