1T91合金管滲碳

　　滲碳(tan)是(shi)因為鑄鐵(tie)件在加(jia)溫或隔熱保溫時，因周(zhou)邊氛圍的功效，使表層(ceng)一部分(fen)(fen)的碳(tan)所有或一部分(fen)(fen)缺(que)失的狀況和反映。鑄鐵(tie)件的滲碳(tan)不(bu)但會導致強度不(bu)夠、淬裂(lie)和熱處(chu)理工藝形變及有機(ji)化學熱處(chu)理工藝缺(que)點，并且對(dui)疲勞(lao)極限(xian)、耐磨性能及模貝特性也是(shi)有非常大影響。

　　2T91合金管延展性不夠

　　延展(zhan)性不夠(gou)的緣故可能(neng)是(shi)熱處理溫度過高(gao)，且隔(ge)熱保(bao)溫時間太(tai)長造成晶體鈍化處理導致的，或因為沒有繞開(kai)淬(cui)火延性區開(kai)展(zhan)淬(cui)火。

　　3T91合金管切削裂痕

　　當產(chan)品工(gong)件內有很多(duo)的殘余馬氏體(ti)時，在切削熱(re)的功效下，產(chan)生(sheng)淬(cui)火變化，進而造成機(ji)構(gou)地(di)應力，造成 產(chan)品工(gong)件裂開(kai)。其(qi)防范措施是(shi)(shi)：熱(re)處理后開(kai)展深冷暴(bao)力或反復多(duo)次淬(cui)火(模貝淬(cui)火一(yi)般為2～3次，即便 是(shi)(shi)冷拉用低(di)合(he)金工(gong)具(ju)鋼也是(shi)(shi)這般)，大限(xian)度(du)地(di)減少殘余馬氏體(ti)量。

　　4T91合金管(guan)充放電生產(chan)加(jia)工(gong)造成(cheng)的裂(lie)痕

　　在(zai)模(mo)(mo)具加(jia)工(gong)(gong)(gong)(gong)中，選(xuan)用(yong)充(chong)放(fang)電生(sheng)(sheng)產(chan)(chan)(chan)(chan)(chan)加(jia)工(gong)(gong)(gong)(gong)(脈沖電流(liu)及線割)是愈來愈廣泛選(xuan)用(yong)的(de)(de)生(sheng)(sheng)產(chan)(chan)(chan)(chan)(chan)加(jia)工(gong)(gong)(gong)(gong)方式，但伴(ban)隨著充(chong)放(fang)電生(sheng)(sheng)產(chan)(chan)(chan)(chan)(chan)加(jia)工(gong)(gong)(gong)(gong)的(de)(de)廣泛運用(yong)，其造(zao)成(cheng)的(de)(de)缺(que)點也相對增加(jia)。因(yin)為充(chong)放(fang)電生(sheng)(sheng)產(chan)(chan)(chan)(chan)(chan)加(jia)工(gong)(gong)(gong)(gong)是憑(ping)借充(chong)放(fang)電所(suo)造(zao)成(cheng)的(de)(de)高溫而(er)(er)使模(mo)(mo)貝表層(ceng)熔融的(de)(de)生(sheng)(sheng)產(chan)(chan)(chan)(chan)(chan)加(jia)工(gong)(gong)(gong)(gong)方式，因(yin)而(er)(er)，在(zai)其生(sheng)(sheng)產(chan)(chan)(chan)(chan)(chan)加(jia)工(gong)(gong)(gong)(gong)表層(ceng)產(chan)(chan)(chan)(chan)(chan)生(sheng)(sheng)白的(de)(de)充(chong)放(fang)電生(sheng)(sheng)產(chan)(chan)(chan)(chan)(chan)加(jia)工(gong)(gong)(gong)(gong)霉變(bian)層(ceng)，并(bing)造(zao)成(cheng)800Mpa上下的(de)(de)拉應力(li)，那樣，在(zai)模(mo)(mo)貝的(de)(de)金(jin)屬加(jia)工(gong)(gong)(gong)(gong)全(quan)過程(cheng)中常(chang)會出現形變(bian)或(huo)裂痕等缺(que)點。因(yin)而(er)(er)，選(xuan)用(yong)充(chong)放(fang)電生(sheng)(sheng)產(chan)(chan)(chan)(chan)(chan)加(jia)工(gong)(gong)(gong)(gong)的(de)(de)模(mo)(mo)貝，務(wu)必充(chong)足把握充(chong)放(fang)電生(sheng)(sheng)產(chan)(chan)(chan)(chan)(chan)加(jia)工(gong)(gong)(gong)(gong)對模(mo)(mo)具材料的(de)(de)影響，并(bing)事先采取有效的(de)(de)防范措施。