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大型不銹鋼鑄件幾類多見的孔洞種類有哪些
來源: | 作者:hkw935742 | 發布時間: 2021-05-25 | 109 次瀏覽 | 分享到:

  大型不銹鋼鑄件幾類多見的孔洞種類有哪些:

  1)大型不銹鋼鑄件的侵入性孔洞通常體積較大,多以圓形、橢圓形及梨形。呈梨形時,梨形尖端就是空氣進入具體位置。在空氣特別多的條件下也有可能變成蜂巢狀,這類孔洞表層光潔,有光澤度或者有輕度氧化色。侵入型孔洞多在鑄件的上表層,挨近砂型和型芯的表層處,單個或局部發生,有時候進入的氣泡也會隨鋼液流通或浮動,使孔洞具體位置不確定,因此也有可能在鑄件別的具體位置處發現孔洞。

  2)在大型不銹鋼鑄件中,析出性孔洞多以聚集均勻分布的小圓球形或裂紋狀多角形,有時候為間斷性的裂紋形態或混合形,經常與縮松共存。在鋼中空氣較少時,析出性孔洞呈裂紋狀,在空氣成分較高時,呈圓球狀,析出性孔洞常在鑄件橫斷面處大面積均勻分布,在冒口附近、大型不銹鋼鑄件死角及后來凝固處占多數。因為這類孔洞是由鋼液中析出的空氣造成的,因此一旦某一大型不銹鋼鑄件發生這類孔洞時,用同一爐或同一包鋼液澆注的大型不銹鋼鑄件,絕大部分也都會有這類孔洞。

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