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Ni-Fe-Cr合金固溶处理后的组织变化及其对性能的影响
Alternative TitleMicrostructure Evolution During Solution Treatment and Its Effects on the Properties of Ni-Fe-Cr Alloy
陈胜虎; 戎利建
2018
Source Publication金属学报
ISSN0412-1961
Volume54.0Issue:003Pages:385-392
Abstract采用OM和SEM研究了不同C含量Ni-Fe-Cr合金在950~1050℃固溶后的组织变化及其对拉伸性能和晶间腐蚀性能的影响。结果表明,C含量的变化影响固溶处理过程中碳化物的回溶行为和晶粒尺寸,从而造成不同C含量合金力学性能和晶间腐蚀性能的差异。C含量为0.010%(质量分数)时,950℃固溶处理可使热加工过程中产生的M23C6碳化物完全回溶,并获得平均晶粒尺寸约38gm的等轴晶组织;C含量增加到0.026%时,固溶温度提高至1000℃可使M23C6碳化物完全回溶,获得平均晶粒尺寸约42um的等轴晶组织;C含量在0.010%~0.026%范围内,合金具有较低的晶间腐蚀敏感性,随C含量增加合金的强度升高,延伸率基本没有变化;C含量为0.056%时,1050℃固溶处理后,局部区域仍存在未回溶的碳化物,碳化物阻碍晶界迁移使晶粒长大缓慢,造成晶粒尺寸不均匀。同时,未回溶碳化物的存在使合金的强度略有提高,但延伸率降低;未回溶碳化物造成碳化物/基体界面处贫Cr区的出现,显著增加了合金的晶间腐蚀敏感性。
Other AbstractNi-Fe-Cr alloys have been widely used for petrochemical, chemical and nuclear applica- tion due to their superior corrosion resistance and good workability. Nowadays, Ni-Fe-Cr alloys with high- er strength are demanded for the engineering application. Increasing the carbon content could enhance the strength of Ni-Fe-Cr alloys due to the solid-solution strengthening effect of interstitial carbon atoms. However, an increase in the carbon content would promote the precipitation of carbides, which would re- duce the corrosion resistance. In order to optimize the carbon content and determine the solution treat- ment, microstructure evolution during solution treatment and its effects on the properties of Ni-Fe-Cr al- loys with different carbon content were investigated using OM and SEM. The results show that variation in carbon content affects the carbide dissolution and grain size during solution treatment, which affects the mechanical properties and intergranular corrosion susceptibility of Ni-Fe-Cr alloys. For the Ni-Fe-Cr alloy with carbon content of 0.010%, M23C6 carbides produced during the hot-working process do not ex- ist after solution treatment at 950 ℃. For the alloy with carbon content of 0.026%, M2℃8 carbides are dis-solved into the matrix when the solution temperature increases to 1000 ℃. An increase in the carbon con- tent from 0.010% to 0.026% results in an increased tensile strength and has slightly observable effect on the elongation. The alloys with the carbon content in the range of 0.010%-0.026% have lower intergranu- lar corrosion susceptibility. As the carbon content increases to 0.056%, M23C6 carbides could not be dis- solved even at the solution temperature of 1050 ℃, and inhomogenous grain-size distribution is ob- served. The presence of undissolved M23C6 carbide weakens the solid-solution strengthening effect of car- bon atoms, and significantly increases the susceptibility to intergranular corrosion.
KeywordNi-Fe-Cr合金 固溶处理 碳化物 拉伸性能 晶间腐蚀
Indexed ByCSCD
Language中文
CSCD IDCSCD:6205198
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/150792
Collection中国科学院金属研究所
Affiliation中国科学院金属研究所
Recommended Citation
GB/T 7714
陈胜虎,戎利建. Ni-Fe-Cr合金固溶处理后的组织变化及其对性能的影响[J]. 金属学报,2018,54.0(003):385-392.
APA 陈胜虎,&戎利建.(2018).Ni-Fe-Cr合金固溶处理后的组织变化及其对性能的影响.金属学报,54.0(003),385-392.
MLA 陈胜虎,et al."Ni-Fe-Cr合金固溶处理后的组织变化及其对性能的影响".金属学报 54.0.003(2018):385-392.
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