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钛棒和、钛合金棒热处理后的金相转变

发布时间: 2019-06-17 07:02:40    浏览次数:

钛棒钛合金棒加热到β相时,会发生a→β的多型性转变。有时这一过程也称为重结晶。高纯钛的a→β的转变温度为875+-5℃。但是直到β相完全形成之前,很难用金相法观察这一过程。对相β出现在低温的原因还不清楚。但实验指出,a与β相互转变,无论是加热还是冷却,a相和β相始终保持一定的布喇格位向关系。对钛合金中加热时的多型性转变迄今研究的很少。

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1、钛棒和钛合金棒在缓慢冷却时的转变

TAIBANGHETAIHEJINBANGCONGβXIANGQUHUANMANLENGQUEDAOa+βXIANGQUSHI,YAOFASHENGβ→aDEDUOXINGXINGZHUANBIAN。ZAIGAOCHUNTAIZHONGYIJINGZHENGSHI,CISHIaXIANGDEXINGHESHIMASHITIXINGDE,ZHANGDAZEKAOREJIHUOGUOCHENG。XINGHESHI,SHIYANGBIAOMIANYEYOUTONGCHANGMASHITIXIANGBIANSHIDEFUTU,ERQIEYETONGYANGYUMUXIANGBAOCHIYANGEDEBULAGEWEIXIANGGUANXI。

2、在快速冷却中的转变

、TAIBANGHETAIHEJINBANGZAIYOUβXIANGQUKUAISULENGQUESHIFASHENGDEZHUANBIANJIZHUANBIANCHANWUSUIZHEβWENDINGYUANSUHANLIANGDEBIANHUAYOUSUOBUTONG。MASHITIXINGXIANGBIAN:1.a`KUAIZHUANGMASHITIWUFACEDEWEIXIANGGUANXI;ZHENZHUANGMASHITIa`YUβXIANGBAOCHIBULAGEWEIXIANGGUANXIGUANXIMIANWEI(334)βHUO(344)β。2.a"ZAITi-Mo,Ti-W,Ti-ReZHONGFAXIAN,DANTi-VXIQUEMEIYOU;a"DEDIANZHENCANSHUSUICHENGFENERBIANHUA;a"SHITAIHEJINSUXINGJIANGDI。

3、淬火ω相形成:

ωSHICHICUNHENXIAODELIZI,JINNENGTONGGUODIANZIXIANWEISHUGUANCHA;ωSHIDANXINGMOLIANGJIYINGDUTIGAO,SHISUXINGXIAJIANG。CEDINGZAIJIEJINGZHUYAOCAIYONGJINXIANGGUANCHAHEXSHEXIANYANSHEXIANGJIEHEDEFANGFA。DANGZAIJIEJINGFASHENGSHI,XINGBIANHOUDEXIANWEIZUZHISHANGCHUXIANXIXIAODEDENGZHOUJINGLI,TONGSHIxSHEXIANBEIFANSHELAOETUXIANGSHANGDEYANSHEHUANKAISHIBIANWEIBULIANJIEDEBANDIAN。DUIYUKERECHULIβHEJIN,HAIKEYIYONGBUWANQUANSHIXIAO(500℃/4~8XIAOSHI,KONGLENG)DEFANGFAXIANSHIZAIJIEJINGZUZHI,JINGBUWANQUANSHIXIAOHOUDEWEIZAIJIEJINGJINGLIZAIFUSHIHOUCHENGANSE。

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