镍基690合金的晶粒控制及其对力学性能的影响

doi:10.13251/j.issn.0254-6051.2020.01.040

摘要/Abstract

摘要： 针对不同C含量的690合金,分别研究了C含量对合金晶粒长大行为及退火孪晶的影响。结果表明:在0.011%~0.028%的范围内,C含量变化显著影响690合金晶粒长大过程,其平均晶粒尺寸随着C含量升高而逐渐减小,尤其是C含量在0.020%~0.028%区间时,C含量的晶粒细化效果更为显著。合金组织中∑3ⁿ(n=1、2、3)晶界体积分数基本均随C含量升高而呈先升后降趋势;0.020%左右C含量合金具有更高的∑9和∑27晶界体积分数分布。在此基础上选择C含量为0.02%的合金进一步探讨了固溶温度变化引起的合金晶粒尺寸与力学性能之间的定量关系发现:690合金晶粒细化对强度的影响规律遵循位错塞积模型的Hall-Petch关系,且通过拟合发现抗拉强度强化系数k_T值(18.95 MPa·mm^1/2)小于屈服强度强化系数k_y值(23.67 MPa·mm^1/2),晶粒细化对屈服强度的强化效果比抗拉强度更高。溶质元素变化通过固溶强化引起的强化增量为243 MPa,而晶粒细化引起的强化增量在157~7 MPa之间,690合金强化机制主要为固溶强化机制。

关键词: 690合金, 碳含量, 晶粒度, 拉伸性能, Hall-Petch关系, 固溶强化, 晶界强化

Abstract: The effects of C content on grain growth and annealing twins of alloy 690 with different C contents were studied. The results show that within the range of 0.011%-0.028%, the change of C content significantly affects the grain growth process of the alloy 690, and its average grain size gradually decrease with the increase of C content. Especially when C content is between 0.020% and 0.028%, the grain refinement effect of C content is more significant. The grain boundary volume fraction of ∑3 ⁿ (n=1, 2, 3) increases first and then decreases with the increase of C content in the alloy structure. The content of C in the alloy of about 0.020% has a higher distribution of the grain boundary volume fraction of ∑9 and ∑27. On this basis, the alloy containing 0.02%C is selected to explore the quantitative relationship between the grain sizes and mechanical properties of the alloy caused by the change of solid solution treatment temperature was further discussed. The influence of grain refinement on the mechanical strength of alloy 690 follows the Hall-Petch relationship of the dislocation pile-up model. Moreover, it is found by fitting that the k _T value of the strengthening coefficient of tensile strength (18.95 MPa·mm ^1/2 ) is smaller than the k _y value of the strengthening coefficient of yield strength (23.67 MPa·mm ^1/2 ), and the grain refinement has a higher strengthening effect on the yield strength than the tensile strength. The strength increment of solute elements caused by solid solution strengthening is 243 MPa, while that caused by grain refinement is 157-7 MPa. The main strengthening mechanism of alloy 690 is solid solution strengthening mechanism.

Key words: alloy 690, carbon content, grain size, tensile properties, Hall-Petch relationship, solid solution strengthening, grain boundary strengthening

中图分类号:

TG146.1

刘哲, 丰涵, 郑文杰, 宋志刚, 朱玉亮, 高鹏. 镍基690合金的晶粒控制及其对力学性能的影响[J]. 金属热处理, 2020, 45(1): 203-209.

Liu Zhe, Feng Han, Zheng Wenjie, Song Zhigang, Zhu Yuliang, Gao Peng. Grain control of Ni-based alloy 690 and its effect on mechanical properties[J]. HTM, 2020, 45(1): 203-209.

参考文献

[1]Zhang L F, Chen K, Du D H, et al. Characterizing the effect of creep on stress corrosion cracking of cold worked alloy 690 in supercritical water environment[J]. Journal of Nuclear Materials, 2017, 492: 32-40.
[2]Stiller K, Nilsson J O, Norring K. Structure, chemistry, and stress corrosion cracking of grain boundaries in alloys 600 and 690[J]. Metallurgical and Materials Transactions A, 1996, 27(2): 327-341.
[3]Young B A, Gao X, Srivatsan T S, et al. An investigation of the fatigue crack growth behavior of INCONEL 690[J]. Materials Science and Engineering A, 2006, 416(1/2): 187-191.
[4]Kim D J, Kim H P, Hwang S S. Susceptibility of alloy 690 to stress corrosion cracking in caustic aqueous solutions[J]. Nuclear Engineering and Technology, 2013, 45(1): 67-72.
[5]李军业, 吴辉, 宋志刚, 等. 爆破阀剪切盖材料690合金热处理工艺[J]. 阀门, 2016(3): 22-25.
Li Junye, Wu Hui, Song Zhigang, et al. Heat treatment process for 690 alloy used for shear cap for squib valve[J]. Valve, 2016(3): 22-25.
[6]付正鸿, 刘锦云, 查五生, 等. 塑性区对Inconel 690合金腐蚀疲劳裂纹扩展行为的影响[J]. 金属热处理, 2016, 41(3): 145-148.
Fu Zhenghong, Liu Jinyun, Cha Wusheng, et al. Effect of plastic zone on corrosion fatigue crack propagation behavior of Inconel 690 alloy[J]. Heat Treatment of Metals, 2016, 41(3): 145-148.
[7]李强, 周邦新. 690合金的显微组织研究[J]. 金属学报, 2001, 37(1): 8-12.
Li Qiang, Zhou Bangxin. A study of microstructure of alloy 690[J]. Acta Metallurgica Sinica, 2001, 37(1): 8-12.
[8]Lee T H, Suh H Y, Han S K, et al. Effect of a heat treatment on the precipitation behavior and tensile properties of alloy 690 steam generator tubes[J]. Journal of Nuclear Materials, 2016, 479: 85-92.
[9]Liu Z Y, Hou Q, Li C T, et al. Correlation between grain boundaries, carbides and stress corrosion cracking of alloy 690TT in a high temperature caustic solution with lead[J]. Corrosion Science, 2018, 144: 97-106.
[10]Kuang W, Was G S. The effects of grain boundary carbide density and strain rate on the stress corrosion cracking behavior of cold rolled alloy 690[J]. Corrosion Science, 2015, 97: 107-114.
[11]郑磊, 张麦仓, 董建新. 690合金平衡相析出规律的热力学数值模拟[J]. 稀有金属材料与工程, 2012, 41(6): 983-988.
Zheng Lei, Zhang Maicang, Dong Jianxin. Thermodynamic simulation of precipitating behaivour of equilibrium phases in alloy 690[J]. Rare Metal Materials and Engineering, 2012, 41(6): 983-988.
[12]Kurban M, Erb U, Aust K T. A grain boundary characterization study of boron segregation and carbide precipitation in alloy 304 austenitic stainless steel[J]. Scripta Materialia, 2006, 54(6): 1053-1058.
[13]Palumbo G, Aust K T, Lehockey E M, et al. On a more restrictive geometric criterion for “Special” CSL grain boundaries[J]. Scripta Materialia, 1998, 38(11): 1685-1690.
[14]周思源, 郑文杰, 宋志刚, 等. 碳含量对690合金组织和力学性能的影响及强化机制[J]. 钢铁, 2012, 47(8): 52-56.
Zhou Siyuan, Zheng Wenjie, Song Zhigang, et al. Effect of carbon content on microstructure, mechanical properties of 690 alloy steel and analysis of strengthening mechanisms[J]. Iron and Steel, 2012, 47(8): 52-56.
[15]丰涵, 宋志刚, 郑文杰, 等. Inconel 690镍基合金平衡相的热力学计算和试验分析[J]. 特殊钢, 2008, 29(4): 13-15.
Feng Han, Song Zhigang, Zheng Wenjie, et al. Thermodynamic calculation and experimental analysis on equilibrium phase in nickel-base alloy 690[J]. Special Steel, 2008, 29(4): 13-15.
[16]丰涵. 热处理工艺对Inconel 690合金组织和性能的影响研究[D]. 北京: 钢铁研究总院, 2008.
[17]毛卫民. 金属再结晶与晶粒长大[M]. 北京: 冶金工业出版社, 1994.
[18]雍歧龙. 钢铁材料中的第二相[M]. 北京: 冶金工业出版社, 2006.
[19]李志刚. 一种镍铁基变形高温合金中退火孪晶界的演变与力学行为[D]. 上海: 上海交通大学, 2015.
[20]夏爽. 690合金中晶界分布特征及其演化机理的研究[D]. 上海: 上海大学, 2008.
[21]胡庚祥, 蔡珣, 戎咏华. 材料科学基础[M]. 上海: 上海交通大学出版社, 2010.
[22]Shaw L L, Ortiz A L, Villegas J C. Hall-Petch relationship in a nanotwinned nickel alloy[J]. Scripta Materialia, 2008, 58(11): 951-954.
[23]Roth H A, Davis C L, Thomson R C. Modeling solid solution strengthening in nickel alloys[J]. Metallurgical and Materials Transactions A (Physical Metallurgy and, Materials Science), 1997, 28(6): 1329-1335.