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style="width:664px; overflow:hidden;">   <p><p>       1.<a href="file://C:/Users/Administrator/Desktop/%E6%96%B0%E9%97%BB/%E8%B6%85%E7%BA%A7%E7%BD%91%E7%BB%9C%E7%BC%96%E8%BE%91%E5%99%A8%20V1.0/edit/www.aoderhcm.com">q热和过?/a>Q过热指钢在加热中逾越{? 应的温度今后Q晶粒长的_大。过热不利热处理Q钢变脆ƈ且机械性能降低Q但可通过d正火或者退火来消除。过烧指׃加热 时刻太长Q温度太高,佉K属出现氧化物或有些熔化的现象。过烧无法I补?</p> <p>   2.qQ脱x指钢表面的碳全部或有些被烧掉 的现象。脱表面出现软点Q降低表面的度、耐磨性还有疲力_度?</p> <p>   3.氧化铍:氧化铍不只丢掉许多钢材,而且降低<a href="http://www.aoderhcm.com/prolist/dj/" target="_blank">Mg</a>加工的表面质量和L的用寿命,若压入金属内部,会构成锻件报废?</p> <p>   4.出现应力Q由于金属内、外受热有差异,胀大不匀Q发作内应力Q称热应力。加热致佉K相组l的先后改变也构成应力,U组l应力。这都会使工件在加热中发作裂U,致 车加工后工g发作裂纹而报废?</p> <p>   5.横断面出现断口:q种~陷破坏了钢的化学成分和l织均匀性,使淬火硬度降低,机械性能变坏。若退火时温度q高而构成石墨断面,不易切削加工且使淬火时q热? 变Ş。但退火时若欠热或温度偏低Q则珠光体未能完全球化,也不利于切削和后来的热处理?</p> <p>   6.而脆的网状碳化物Q它削弱了晶料间的结合力Q机械性能昄变差Q特别冲击耐性降低,但可通过正火来改善或消除。若出现带状_物,会淬火和回火后的硬 度及l织不均Q且略变形,q也是珠光体与铁素体沿加工变形方向出现带状组l的一U缺陗一同,它还会降低钢的塑性和耐性,使R加工度不稳定,刀L敏磨?</p></p><br> <p><div>上一?<a href="41.html">Mg加工的利益是什么呢</a></div> <div>下一?<a 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