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铝合金压é“怚g的热处置是指按某一热处¾|®è§„èŒ?控制加热温度、保温时åˆÕd’Œå†·å´é€Ÿåº¦,改变合金的安æŽ?其主要目的是åQšè¿›æ­¥åŠ›å­¦åŠŸèƒ?增强耐腐蚀功能,改进加工功能,取得ž®ºåº¦çš„安½EÏx€§ã€‚铝合金é“怚g的热处置工艺能够分äؓ如下四类åQ?</div> <div style="padding:0px;margin:0px;"> 1.退火处¾|?</div> <div style="padding:0px;margin:0px;"> ž®†é“åˆé‡‘é“怚g加热到较高的温度,一般约ä¸?00℃左å?保温一定的时刻å?随炉冷却到室温的工艺¿UîCؓ退火。在退火过½E‹ä¸­å›ºæº¶ä½“发生分è§?½W¬äºŒç›¸è´¨ç‚¹å‘生聚é›?能够消除é“怚g的内应力,安稳é“怚gž®ºåº¦,减少变åŞ,增大é“怚g的塑性ã€?</div> <div style="padding:0px;margin:0px;"> 2.固溶处置 </div> <div style="padding:0px;margin:0px;"> 把铸件加热到ž®½å¯èƒ½é«˜çš„温åº?接近于共晶体的熔ç‚?在该温度下坚持èƒö够长的时åˆ?òq‰™šåŽç–¾é€Ÿå†·å?使强化组元较大限度的溶解,˜q™ç§é«˜æ¸©çŠ¶æ€è¢«å›ºå®šä¿ç®¡åˆ°å®¤æ¸?该过½E‹ç§°ä¸ºå›ºæº¶å¤„¾|®ã€‚固溶处¾|®èƒ½å¤Ÿè¿›æ­¥é“¸ä»¶çš„强度和塑æ€?改进合金的耐腐蚀功能。固溶处¾|®çš„作用主要取决于下列三个要素: </div> <div style="padding:0px;margin:0px;"> (1)固溶处置温度。温度越é«?强化元素溶解速度­‘Šå¿«, </div> <div style="padding:0px;margin:0px;"> 强化作用­‘Šå¥½ã€‚一般加热温度的上限低于合金开始过烧温åº?而加热温度的下限应ä‹É强化¾l„å…ƒž®½å¯èƒ½å¤šåœ°æº¶å…¥å›ºæº¶ä½“中。äؓ了取得好的固溶强化作ç”?而又不方便合金过çƒ?有时选用分çñ”加热的办æ³?卛_œ¨ä½Žç†”点共晶温度下保温,使组元扩散溶解后,低熔点共晶不存在,再升到更高的温度˜q›è¡Œä¿æ¸©å’Œæ·¬ç«ã€‚固溶处¾|®æ—¶,˜q˜åº”当注意加热的升温速度不宜˜q‡å¿«,以免é“怚g发生变åŞ和部分聚集的低熔点安排熔化而äñ”生过烧。固溶热处置的悴火è{¿UÀL—¶åˆÕdº”ž®½å¯èƒ½åœ°çŸ?一般应不大äº?5s,以免合金元素的扩散析å‡ø™€Œé™ä½Žåˆé‡‘的功能ã€?</div> <div style="padding:0px;margin:0px;"> (2)保温时刻。保温时åˆÀL˜¯ç”±å¼ºåŒ–元素的溶解速度来决定的, </div> <div style="padding:0px;margin:0px;"> ˜q™å–决于合金的种¾c…R€æˆåˆ†ã€å®‰æŽ’、铸造办法和é“怚g的åŞ状及壁厚。铸造铝合金的保温时åˆÀL¯”变åŞ铝合金要长得å¤?一般由实验¼‹®å®š, </div> <div style="padding:0px;margin:0px;"> 一般的砂型é“怚g比同¾cÕdž‹çš„金属型é“怚g要åšgé•?0%-25%ã€?</div> <div style="padding:0px;margin:0px;"> (3)冷却速度。淬火时¾l™äºˆé“怚g的冷却速度­‘Šå¤§, </div> <div style="padding:0px;margin:0px;"> 使固溶体自高温状态保½Ž¡ä¸‹æ¥çš„˜q‡é¥±å’Œåº¦ä¹Ÿè¶Šé«?从而ä‹Éé“怚g取得高的力学功能,但同时所形成的内应力也越å¤?佉K“¸ä»¶å˜å½¢çš„可能性也­‘Šå¤§ã€‚冷却速度能够通过选用å…ähœ‰ä¸åŒçš„热定w‡ã€å¯¼çƒ­æ€§ã€è’¸å‘潜热和¾_˜æ»žæ€§çš„冷却介质来改å?ä¸ÞZº†å¾—到较小的内应力,é“怚g能够在热介质(沸水、热æ²ÒŽˆ–熔盐)中冷却ã€?</div> <div style="padding:0px;margin:0px;"> ä¸ÞZº†ä¿è¯é“怚g在淬火后,同时å…ähœ‰é«˜çš„力学功能和低的内应力,有时选用½{‰æ¸©æ·¬ç«,åÏxŠŠ¾lå›ºæº¶å¤„¾|®çš„é“怚g淬入200-250℃的热介质中保温一定时åˆ?把固溶处¾|®å’Œæ—¶æ•ˆå¤„ç½®¾l“合èµäh¥ã€?</div> <div style="padding:0px;margin:0px;"> 3.时效处置ž®†å›ºæº¶å¤„¾|®åŽçš„铸件加热到某一温度,保温一定时åˆÕdŽå‡ºç‚‰,在空气中¾~“慢冷却到室温的工艺¿UîCؓ时效。若是时效强化是在室温下˜q›è¡Œçš„称为天然时æ•?若是时效强化是在高于室温òq¶ä¿æ¸©ä¸€ŒD‰|—¶åˆÕdŽ˜q›è¡Œ¿UîCؓ人工时效。时效处¾|®è¿›è¡Œç€˜q‡é¥±å’Œå›ºæº¶ä½“分解的自发过½E?从而ä‹É合金åŸÞZ½“的点阉|¢å¤åˆ°æ¯”较安稳的状态。时效温度和时刻的选择取决于对合金功能的要求、合金的ç‰ÒŽ€§ã€å›ºæº¶ä½“的过饱和½E‹åº¦ä»¥åŠé“”R€ åŠžæ³•ç­‰ã€?</div> <div style="padding:0px;margin:0px;"> 人工时效可分ä¸ÞZ¸‰¾c?不完全äh工时æ•?完全人工时效和过时效。不完全人工时效是选用比较低的时效温度或较短的保温时刻,取得优秀的综合力学功èƒ?卛_–得比较高的强åº?良好的塑性和韧æ€?但耐腐蚀功能可能比较低。完全äh工时效是选用较高的时效温度和较长的保温时åˆ?取得较大的硬度和较高的抗拉强åº?但äŽ×长率较低。过时效是在更高的温度下˜q›è¡Œ,˜q™æ—¶åˆé‡‘坚持较高的强åº?同时塑性有所˜q›æ­¥, </div> <div style="padding:0px;margin:0px;"> 主要是äؓ了得到好的抗应力腐蚀功能。äؓ了得到安½E³çš„安排和几何尺åº?时效应该在更高的温度下进行。过时效依据使用要求一般也分äؓ安稳化处¾|®å’Œè½¯åŒ–处置ã€?</div> <div style="padding:0px;margin:0px;"> 4.å†ïLƒ­å¾ªçŽ¯å¤„ç½® </div> <div style="padding:0px;margin:0px;"> ¾lå†·çƒ­åó@环处¾|®çš„é“怚g,ç”׃ºŽå±¡æ¬¡åŠ çƒ­å’Œå†·å´å¼•èµ·å›ºæº¶ä½“ç‚šw˜µæ”¶ç¾ƒå’Œè†¨èƒ€,使各相的晶格发生了少è®æ€½¿U?使第二相质点处于更加安稳的状æ€?从而进步铸件尺度的安稳æ€?适于¾_‘Ö¯†é›¶äšg的制造ã€?</div> <div style="padding:0px;margin:0px;"> 铝合金在低温下没有脆性断裂的們֐‘,随着温度的降ä½?力学功能有某些变åŒ?强度有所˜q›æ­¥,但塑性却降低得很ž®?所以有时äؓ了减ž®æˆ–消除é“怚g内应åŠ?可将铔R€ æˆ–淬火后的é“怚g,冷却åˆ?50℃ã€?70℃或更低的温åº?坚持2-3h,随后在空气或热水中加热到室温,或者是接着˜q›è¡Œäººå·¥æ—¶æ•ˆ,˜q™ç§å·¥è‰º¿U°å†·å¤„ç½®ã€?</div></p> </div> <div class="pagess"> <ul><div>上一æ?<a href="388.html">压铸件欠压的主要原因分析</a></div> <div>下一æ?<a 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