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铝合金(jin)时(shi)(shi)(shi)(shi)(shi)效(xiao)(xiao)(xiao)(xiao)炉时(shi)(shi)(shi)(shi)(shi)效(xiao)(xiao)(xiao)(xiao)处(chu)理(li)(li):指合金(jin)工(gong)(gong)件经固溶处(chu)理(li)(li),冷塑性变形(xing)或(huo)铸造,锻造后,在较(jiao)高的(de)(de)(de)温度(du)放(fang)置或(huo)室(shi)温保(bao)持(chi)其性能,形(xing)状(zhuang),尺(chi)寸随时(shi)(shi)(shi)(shi)(shi)间(jian)而(er)变化的(de)(de)(de)热(re)处(chu)理(li)(li)工(gong)(gong)艺。若采(cai)用将(jiang)工(gong)(gong)件加热(re)到较(jiao)高温度(du),并较(jiao)短时(shi)(shi)(shi)(shi)(shi)间(jian)进行时(shi)(shi)(shi)(shi)(shi)效(xiao)(xiao)(xiao)(xiao)处(chu)理(li)(li)的(de)(de)(de)时(shi)(shi)(shi)(shi)(shi)效(xiao)(xiao)(xiao)(xiao)处(chu)理(li)(li)工(gong)(gong)艺,称(cheng)为人工(gong)(gong)时(shi)(shi)(shi)(shi)(shi)效(xiao)(xiao)(xiao)(xiao)处(chu)理(li)(li),若将(jiang)工(gong)(gong)件放(fang)置在室(shi)温或(huo)自然条(tiao)件下长时(shi)(shi)(shi)(shi)(shi)间(jian)存(cun)放(fang)而(er)发(fa)生的(de)(de)(de)时(shi)(shi)(shi)(shi)(shi)效(xiao)(xiao)(xiao)(xiao)现象,称(cheng)为自然时(shi)(shi)(shi)(shi)(shi)效(xiao)(xiao)(xiao)(xiao)处(chu)理(li)(li)。时(shi)(shi)(shi)(shi)(shi)效(xiao)(xiao)(xiao)(xiao)处(chu)理(li)(li)的(de)(de)(de)目的(de)(de)(de),消除(chu)工(gong)(gong)件的(de)(de)(de)内(nei)应力,稳定(ding)组织(zhi)和尺(chi)寸,改善(shan)机械(xie)性能等.
铝(lv)时(shi)(shi)效发(fa)现(xian),这(zhei)种合(he)金(jin)(jin)(jin)淬火后(hou)硬(ying)(ying)度(du)(du)不高(gao),但(dan)在室温(wen)(wen)(wen)(wen)下放置(zhi)一(yi)(yi)(yi)段(duan)时(shi)(shi)间(jian)后(hou),硬(ying)(ying)度(du)(du)便显著上升,这(zhei)种现(xian)象(xiang)后(hou)来被称为沉淀硬(ying)(ying)化(hua)。这(zhei)一(yi)(yi)(yi)发(fa)现(xian)在工程(cheng)界引起了极大(da)兴(xing)趣。随后(hou)人(ren)们相(xiang)继发(fa)现(xian)了一(yi)(yi)(yi)些可以采用时(shi)(shi)效处理(li)(li)进行强(qiang)(qiang)化(hua)的铝(lv)合(he)金(jin)(jin)(jin)、铜合(he)金(jin)(jin)(jin)和铁基合(he)金(jin)(jin)(jin),开创了一(yi)(yi)(yi)条与(yu)一(yi)(yi)(yi)般钢铁淬火强(qiang)(qiang)化(hua)有本质(zhi)差(cha)异的新的强(qiang)(qiang)化(hua)途径——时(shi)(shi)效强(qiang)(qiang)化(hua).在时(shi)(shi)效处理(li)(li)前进行固溶处理(li)(li)时(shi)(shi),加(jia)热(re)温(wen)(wen)(wen)(wen)度(du)(du)必(bi)须(xu)严格(ge)控制(zhi),以便使溶质(zhi)原子(zi)能大(da)限度(du)(du)地固溶到固溶体中(zhong),同时(shi)(shi)又不致(zhi)使合(he)金(jin)(jin)(jin)发(fa)生(sheng)(sheng)熔化(hua)。许(xu)多铝(lv)合(he)金(jin)(jin)(jin)固溶处理(li)(li)加(jia)热(re)温(wen)(wen)(wen)(wen)度(du)(du)容许(xu)的偏(pian)差(cha)只有5℃左右(you)。进行人(ren)工时(shi)(shi)效处理(li)(li),必(bi)须(xu)严格(ge)控制(zhi)加(jia)热(re)温(wen)(wen)(wen)(wen)度(du)(du)和保温(wen)(wen)(wen)(wen)时(shi)(shi)间(jian),才能得到比较(jiao)理(li)(li)想的强(qiang)(qiang)化(hua)效果。生(sheng)(sheng)产中(zhong)有时(shi)(shi)采用分段(duan)时(shi)(shi)效,即(ji)先在室温(wen)(wen)(wen)(wen)或比室温(wen)(wen)(wen)(wen)稍高(gao)的温(wen)(wen)(wen)(wen)度(du)(du)下保温(wen)(wen)(wen)(wen)一(yi)(yi)(yi)段(duan)时(shi)(shi)间(jian),然后(hou)在更高(gao)的温(wen)(wen)(wen)(wen)度(du)(du)下再(zai)保温(wen)(wen)(wen)(wen)一(yi)(yi)(yi)段(duan)时(shi)(shi)间(jian)。这(zhei)样作有时(shi)(shi)会(hui)得到较(jiao)好(hao)的效果。

来源:http://savauri.com/product718196.html
发布时间:2021-4-25 14:17:11
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