通过对一种定向凝固合金进行不同温度的固溶处理、蠕变性能测试及组织形貌观察,研究了固溶温度对枝晶臂/间区域的成分偏析及持久性能的影响.结果表明:经1230℃固溶及时效处理后,合金在枝晶干/间区域存在明显的成分偏析和组织不均匀性,粗大γ’相存在于枝晶间区域,细小γ’相存在于枝晶干区域,碳化物呈条状分布在枝晶间区域.合金经1260℃固溶及时效处理后,可明显降低合金中元素的偏析程度,并消除了合金在枝晶间区域存在中的粗大γ’相,使高体积分数细小立方γ '相均匀分布在枝晶间和枝晶干区域,并有细小粒状碳化物沿晶界析出,抑制晶界滑移,因此,可大幅度改善合金的中温蠕变性能.合金在中温蠕变期间的变形特征是位错在基体中滑移和剪切γ’相,并在γ’/γ两相界面形成位错网.蠕变后期,由于沿与应力轴呈45°角的晶界承受载荷的最大剪切应力,故裂纹易于在与应力轴呈45 °角的倾斜晶界处萌生与扩展.
参考文献
| [1] | 黄炎,王磊,刘杨,付顺明,吴剑涛,燕平.一种定向凝固镍基高温合金950℃ 长期时效1000h的组织演变[J].中国有色金属学报（英文版）,2011(10):2199-2204. |
| [2] | Jiang W,Guan H R,Hu Z Q .Effects of heat treatment on microstructures and mechanical properties of a directionally solidified cobalt-base superalloy[J].Materials Science and Engineering A,1999,271 |
| [3] | 佘力,陈荣章,王涛.定向凝固铸造高温合金DZ125热处理工艺的研究[J].材料热处理学报,2002(04):13-15. |
| [4] | 刘丽荣,金涛,赵乃仁,王志辉,孙晓峰,管恒荣,胡壮麒.热处理对一种镍基单晶高温合金微观组织和持久性能的影响[J].稀有金属材料与工程,2006(05):711-714. |
| [5] | 谢君,田素贵,周晓明,李晶晶,汪武祥.固溶温度对FGH95镍基合金持久断裂机制的影响[J].稀有金属材料与工程,2012(03):447-451. |
| [6] | 杨金侠,李金国,王猛,王延辉,金涛,孙晓峰.热处理工艺对一种新型铸造镍基高温合金的组织和性能影响[J].金属学报,2012(06):654-660. |
| [7] | Tan X P,Liu J L,Jin T,et al .Effect of ruthenium on high-temperature creep rupture life of a single crystal nickel-based superalloy[J].Materials Science and Engineering A,2011,528 |
| [8] | Nathal M V,Mackay R,Miner R .Influence of precipitate morphology on intermediate temperature creep properties of a nickel-base superalloy single crystal[J].Metallurgical Transactions A,1989,20(1):133-141.,1989. |
| [9] | Monajati H,Jahazi M,Bahrami R,et al .The influence of heat treatment conditions on γ' characteristics in Udimet 720[J].Materials Science and Engineering A,2004,373 |
| [10] | 刘洋,田素贵,周晓明,赵忠刚,包宪宇,汪武祥.FGH95粉末镍基合金的组织结构与蠕变特征[J].材料工程,2007(z1):27-32. |
| [11] | Caron P .On the effects of heat treatments on the creep behaviour of a single crystal superalloy[J].Scripta Materialia,1986,20 |
| [12] | 田素贵,周惠华,张静华,等 .一种单晶镍基合金蠕变初期的位错组态[J].金属学报,1998,34(2):123-128TIAN Su-gui,ZHOU Hui-hua,ZHANG Jing-hua,et al.Dislocation configuration in single crystal nickel-base alloy during primary creep[J].Acta Metallurgica Sinica,1998,34 (2):123-128.,1998. |
| [13] | 丁智,张军,王常帅,苏海军,刘林,傅恒志.DZ125镍基高温合金高温持久断裂后的位错组态[J].金属学报,2011(01):47-52. |
| [14] | 郭士文,张玉锁,童开峰,杨洪才.镍基高温合金长期时效后γ′相长大动力学[J].东北大学学报(自然科学版),2003(06):576-579. |
| [15] | Liu L R,Jin T,Zhao N N,et al .Formation of carbides and their effects on stress rupture of a Ni base single crystal superalloy[J].Materials science and Engineering A,2003,361 |
| [16] | Chen Q Z,Jonesa N,Knowles D M .The microstructure of base modified RR2072 SX superalloys and their effects on creep properties at elevated temperatures[J].Acta Materialia,2002,50 |
| [17] | Youdelis W V,Kwon O .Carbide phases in nickel based superalloy nucleation properties of MC type carbide[J].Metal Science,1983,17(8):385-388.,1983. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%