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        公司動態

        NM360耐磨板熱處理退火工藝

        時間:2012-02-02 13:48:49 來源:http://www.masrlaptop.com 點擊量:6488

        NM360耐磨板熱處理退火工藝 ,我公司倉庫26畝,大喜哪個室內外火場,*大吊40噸,可為客戶提供熱軋、冷軋、板才代理個大廠家鋼板,耐磨板材為主要通道。

         
          NM360耐磨板的熱處理工藝 通過一定溫度的加熱、一定時間的保溫和一定速度的冷卻,來改變金屬及合金的內部結構(組織),以期改變鋼板及合金的物理、化學和機械性能的方法,稱為熱處理。 耐磨板的熱處理過程,是以鐵碳平衡圖為基礎的。根據鋼在實際操作中的加熱溫度,冷卻條件以及對鋼結構和性能的要求,可以將熱處理分為退火、正火、淬火和回火等。現分述如下: 1.退火 把鋼加熱到一定溫度,并在這一溫度停留一定的時間,然后再緩慢均勻地冷卻到常溫,這一熱處理過程稱為退火。 NM360耐磨板退火的目的是: (1)降低耐磨板硬度,便于切削加工, (2)使鋼板的晶粒變細,提高強度、韌性和塑性, (3)消除因加工而引起的內應力, (4)消除或減少耐磨鋼板的化學成分和組織的不均勻性。 根據處理的目的和加熱溫度,NM360耐磨板退火主要有四種類型,如圖3-3所示。此圖是鐵碳平衡圖中含碳量小于1.6%的那一部分(參見圖3-2)。
         
            (1)再結晶退火把經過冷加工的耐磨板加熱到再結晶溫度以上100~200"C,即650 ^-7000C,待工件完全燒透后空冷,稱為再結晶退火。其目的在于通過再結晶使變形晶粒恢復為等軸晶粒,消除因冷變形引起的加工硬化,從而恢復鋼的塑性。 (2)完全退火把亞共析鋼板加熱到A,,,以上30~50.0,然后緩慢冷卻。亞共析鋼加熱到A。3以上時,發生轉變再結晶,即由鐵素體+珠光體轉變為奧氏體。在正常情況下,新奧氏體晶粒比原來轉變為鐵素體+珠光體的原奧氏體晶粒要細,又因是緩慢冷卻得到粗珠光體,所以NM360耐磨板退火以后既細化了晶粒,同時也達到了軟化的目的。 有時,為了消除鋼的晶粒內部偏析,將加熱溫度提高到Ass以上100.1500C,以利于鋼中碳和其他合金元素擴散,*后得到成分均勻的組織,這種退火則稱“擴散退火”。 ( 3)球化退火把過共析鋼加熱到略高于Ae、的溫度,然后緩慢冷卻。過共析鋼加熱到A},以上,珠光體變為奧氏體并溶解一部分自由滲碳體,但尚有未溶解的滲碳體殘粒存在,在隨后
         
        的緩冷中,這些殘拉便成為滲潰體聚集的核心,因而得到珠光體是球狀珠光體,即粒狀滲碳體分布在鐵素體基體上。在切削過程中,球狀滲碳體碰上刀刃的幾率比層狀滲碳體少,因而有利于切削加工。此外經球化退火后的NM360耐磨板,淬火時亦不易產生變形和裂紋。 (4)消除應力退火的NM360耐磨板材主要用于消除鑄件和焊接結構件的內應力以及由粗機械加工引起的內應力,以防止使用過程中發生部件的變形。一般是將工件緩慢加熱到500~6000C,經適當保溫緩冷。
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