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熱工藝處理

更新時間:2018-01-29 點擊數:876

熱處理工藝

DESICAI,BUXIUGANGZHIPINJITAIHEJINCAI,ZUOGUANGLIANGTUIHUOJUNKECAIYONGZHENKONGCHULI。TUIHUOWENDUYUDI,ZEYAOQIUZHENKONGDUYUGAO。WEIFANGZHIGEDEZHENGFAJIJIASURECHUANDAO,YIBANCAIYONGZAIQIJIARE(BAOWEN)FA,BINGZHUYIDUIBUXIUGANGHETAIHEJINBUYIYONGDANERYINGCAIYONGYAQI。

過程

ZHENKONGCUIHUOZHENKONGCUIHUOLUANLENGQUEFANGFAFENWEIYOUCUIHEQICUILIANGLEI,ANGONGWEISHUFENWEIDANSHISHIHESHUANGSHISHI,904SHANWEICHAOJUNSHUZHOUQISHIZUOYELU。ZHENKONGYOUCUILUDOUSHISHUANGSHIDE,HOUSHIZHIDIANJIAREYUANJIAN,QIANSHIDEXIAFANGZHIYOUCAO。GONGJIANWANCHENGJIARE、BAOWENHOUYIRUQIANSHI,GUANBIZHONGMENHOUXIANGQIANSHICHONGRUDUOXINGQIZHIDAYUE2.66%26times;lO ~1.01%26times;10 Pa(200~760mmGONGZHU),RUYOU。YOUCUIYIYINQIGONGJIANBIAOMIANBIANZHI。YOUYUBIAOMIANHUOXINGDA,ZAIDUANZANDEGAOWENYOUMOZUOYONGXIAJIKEFASHENGXIANZHUBOCENGSHENTAN,CIWAI,TANHEIHEYOUZAIBIAOMIANDEZHANFUDUIJIANHUARECHULILIUCHENGHENBULI。ZHENKONGCUIHUOJISHUDEFAZHANZHUYAOZAIYUYANZHIXINGNENGYOULIANG、GONGWEIDANYIDEQILENGCUIHUOLU。QIANSHUSHUANGSHISHILUYIKEYONGYUQICUI(ZAIQIANSHIPENQILENGQUE),DANSHUANGGONGWEISHIDECAOZUOSHIDAPILIANGZHUANGLUDESHENGCHANFASHENGKUNNAN,YEYIZAIGAOWENYIDONGZHONGYINQIGONGJIANBIANXINGHUOGAIBIANGONGJIANFANGWEIZENGJIACUIHUOBIANXING。DANYIGONGWEIDEQILENGCUIHUOLUSHIZAIJIAREBAOWENWANCHENGHOUZAIJIARESHINEIPENQILENGQUE。QILENGDELENGSUBURUYOULENGKUAI,YEDIYUCHUANTONGCUIHUOFAZHONGDERONGYANDENGWEN、FENJICUIHUO。YINER,BUDUANTIGAOPENLENGSHIYALI,ZENGDALIULIANG,YIJICAIYONGMOERZHILIANGBIDANHEYAXIAODEDUOXINGQITIHAIHEQING,SHIDANGJINZHENKONGCUIHUOJISHUFAZHANDEZHULIU。70NIANDAIHOUQIJIANGDANQIPENLENGDEYALICONG(1~2)%26times;10PaTIGAODAO(5~6)%26times;10Pa,SHILENGQUENENGLIJIEJINYUCHANGYAXIADEYOULENG。80NIANDAIZHONGQICHUXIANCHAOGAOYAQICUI,YONG(10~20)%26times;10PaDEHAI,LENGQUENENGLIDENGYUHUOLVEGAOYUYOUCUI,YIJINRUGONGYESHIYONG。90NIANDAICHUCAIYONG40%26times;10PaDEQINGQI,JIEJINSHUICUIDELENGQUENENGLI,SHANGCHUYUQIBUJIEDUAN。GONGYEFADAGUOJIAYIJINZHANDAOYIGAOYA(5~6)%26times;10。PaQICUIWEIZHUTI,ERZHONGGUOCHANQICUIYIXIEJINSHUDEZHENGQIYA(LILUNZHI)YUWENDUDEGUANXIZESHANGCHUYUYIBANJIAYAQICUI(2%26times;10Pa)XINGJIEDUAN。

結果真空滲碳為真空滲碳一淬火工藝曲線。在真空中加熱到滲碳溫度并保溫使表面凈化、活化之后,通入稀薄滲碳富化氣(見控制氣氛熱處理),在大約1330Pa(10T0rr)負壓下進行滲入,然后停氣(降壓)進行擴散。滲碳后的精密鋼管淬火采用一次淬火法,即先停電,通氮冷卻工件至臨界點A,、以下,使內部發生相變,再停氣、開泵,升溫到Ac1,~Accm之間。淬冷方法可采用氣冷或油冷。后者為奧氏體化后移入前室,充氮至常壓,入油。真空滲碳的溫度一般高于普通氣體滲碳,常采用920~1040℃滲入和擴散可按所示分兩階段,也可用脈沖式通氣、停氣,多段式的滲一擴相間,效果更好。由于溫度高,尤其表面潔凈、有活性,真空滲碳層形成速度比普通氣體、液體和固體滲碳快,如要求滲層為1mm時,在927℃只需5h,而1033℃僅需1h。

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