时效热处理对冷变形Co-Ni合金强度的影响  

Influence of aging heat treatment on strength of cold worked Co-Ni alloy

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作  者:陈雨来[1] 杨东艳[1] 李静媛[2] 

机构地区:[1]北京科技大学冶金工程研究院,北京100083 [2]北京科技大学材料科学与工程学院,北京100083

出  处:《材料热处理学报》2016年第9期50-56,共7页Transactions of Materials and Heat Treatment

基  金:国家自然科学基金(51174026)

摘  要:以自制Co-Ni合金(31%Co-42%Ni-18Cr-9%Mo)为研究对象,在83.7%总变形量冷轧后进行了400~700℃、1~10 h的时效热处理。对不同状态的试样进行强度、硬度和伸长率检测,并通过XRD、SEM和TEM对实验合金的拉伸断口和微观组织进行分析。结果表明:该Co-Ni合金在500℃等温时效4 h后抗拉强度最高,达2220.19 MPa,比冷轧状态提高21.63%,同时其显微维氏硬度也达到极值650 HV,比冷轧状态提高28.6%。显微组织分析发现,新生的纳米级片层状孪晶起到主要的强化作用;在冷轧过程中应变诱导产生的Co(Cr,Mo)颗粒在时效过程中重新溶入基体,对合金的强度无明显作用;当时效温度高于600℃时,合金强度大大降低,塑性明显提高。31% Co-42% Ni-18% Cr-9% Mo alloy was treated by large cold rolled to 83.7% reduction and subsequently aging at 400-700 ℃for 1-10 h.The strength,hardness and elongation of the alloy at different states were tested,microstructure and tensile fracture of the alloy were observed by means of XRD,SEM and TEM.The results show that the peak strength and hardness of the alloy are 2220.185 MPa and650 HV when aged at 500 ℃ for 4 h,which increase by 21.63% and 28.6% than those of at rolling state respectively.The microstructure analysis indicates that the new nano scale lamellar twins play a major role in strengthening during aging treatment; Co(Cr,Mo) particles induced by strain during cold rolling reintegrated into the matrix during aging,and has no significant effect on the strength of the alloy; however,when the aging temperature is higher than 600 ℃,the strength of the alloy decreases quickly,while the ductility increases largely.

关 键 词:Co-Ni合金 时效 强化 孪晶 

分 类 号:TG146.1[一般工业技术—材料科学与工程]

 

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