UNS N10276合金时效析出行为研究
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摘要
UNS N10276合金是一种含碳量极低的镍基耐蚀合金。对固溶态UNS N10276合金在不同温度(650℃、760℃、870℃、980℃、1 090℃)进行时效,分别保温不同时间(5 min、15 min、30 min、2 h、4 h、8 h、24 h、48 h、72 h、96 h、120 h、168 h、240 h)。随后采用扫描电镜和透射电镜研究了合金中的析出相,测定了合金的冲击韧度,以揭示时效工艺对合金析出行为及冲击性能的影响。结果表明:在时效过程中,UNS N10276合金的第二相主要为富钼的M_6C型碳化物和μ相,并首先在晶界析出,随着时效时间的延长,晶界析出饱和后在晶内析出;合金的冲击性能随着时效时间的延长而显著下降,特别是在870～980℃时效。因此在生产中,该合金不宜长时间在870～980℃保温。
UNS N10276 alloy is a nickel-base corrosion resistant alloy with ultra-low carbon content. The UNS N10276 alloy solution treated was aged at different temperatures such as 650 ℃,760 ℃,870 ℃,980 ℃, and1 090 ℃ for different time such as 5 min, 15 min,30 min,2 h,4 h,8 h,24 h,48 h,72 h,96 h,120 h,168 h, and240 h, respectively. After this, precipitated phases in the alloy were investigated by using SEM and TEM, and impact toughness of the alloy also was measured, to discover the effect of the aging processes on precipitating behavior and impact property of the alloy. The results indicated that in the process of aging of the alloy, second phases which were predominantly molybdenum-enriched M_6 C-type carbide and μ phase precipitated first in grain boundary, then in grain interiors when the aging time became longer with the result that the grain boundary was saturated with the second phases. Besides, as the aging lime increased, particularly, after aging at temperatures ranging from 870 to 980 ℃, the alloy exhibited much lower impact toughness. Consequently, it is not suitable to hold the UNS N10276 alloy at 870 to 980 ℃ for relatively long time in the production.
UNS N10276 alloy is a nickel-base corrosion resistant alloy with ultra-low carbon content. The UNS N10276 alloy solution treated was aged at different temperatures such as 650 ℃,760 ℃,870 ℃,980 ℃, and1 090 ℃ for different time such as 5 min, 15 min,30 min,2 h,4 h,8 h,24 h,48 h,72 h,96 h,120 h,168 h, and240 h, respectively. After this, precipitated phases in the alloy were investigated by using SEM and TEM, and impact toughness of the alloy also was measured, to discover the effect of the aging processes on precipitating behavior and impact property of the alloy. The results indicated that in the process of aging of the alloy, second phases which were predominantly molybdenum-enriched M_6 C-type carbide and μ phase precipitated first in grain boundary, then in grain interiors when the aging time became longer with the result that the grain boundary was saturated with the second phases. Besides, as the aging lime increased, particularly, after aging at temperatures ranging from 870 to 980 ℃, the alloy exhibited much lower impact toughness. Consequently, it is not suitable to hold the UNS N10276 alloy at 870 to 980 ℃ for relatively long time in the production.
引文
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[10]秦紫瑞,李隆盛.HastelloyC型铸造镍基合金的析出相及其对合金腐蚀行为的影响[J].材料工程,1995(9):18-21.
[11]焦少阳,朱冠妮.Hastelloy C-276中碳化物析出及晶界贫Mo规律研究[J].材料工程,2011(1):49-50.
[2]陆世英.超级不锈钢和高镍耐蚀合金[M].北京:化学工业出版社,2012.
[3]康喜范.镍及其耐蚀合金[M].北京:冶金工业出版社,2016.
[4]徐长征,马天军.主泵屏蔽套用C-276合金薄板的研制[J].大电机技术,2017(2):12-16.
[5]GDOWSKI G E.Survey of degradation modes of four NickelChromium-Molybdenum alloys[Z].LLNL Report No.UCRL-ID-108330,1991:67.
[6]李隆盛.Ni-Cr-Mo型铸造镍基合金中析出相的形成规律及其对合金耐蚀性能的影响[J].大连工学院学报,1987(1):39-40.
[7]马永会.定向凝固镍基高温合金中μ相析出对室温拉伸性能的影响[J].电子显微学报.2006(25):116-117.
[8]AKHTER J I,SHAIKH M A.Effect of aging on the hardness and impact properties of Hastelloy C-276[J].Journal of Materials Science Letters,2001(20):333-335.
[9]郭可信.高合金钢与高温合金中的相[J].金属学报,1978(1):74-95.
[10]秦紫瑞,李隆盛.HastelloyC型铸造镍基合金的析出相及其对合金腐蚀行为的影响[J].材料工程,1995(9):18-21.
[11]焦少阳,朱冠妮.Hastelloy C-276中碳化物析出及晶界贫Mo规律研究[J].材料工程,2011(1):49-50.