文章信息/Info

Title:

Thermodynamic and diffusion databases for multicomponent cemented carbides and their applications

作者:

張聰1; 2)張偉彬1; 2)彭英彪1; 2)陳偉民1; 2)周鵬1; 2)李娜1; 2)程開明1; 2)陳利1; 2)張利軍1; 2)劉樹紅1; 2)杜勇1; 2)王社權(quán)3)溫光華3)謝文3)

1中南大學(xué)粉末冶金國家重點(diǎn)實(shí)驗(yàn)室，湖南長沙410083

2中德微結(jié)構(gòu)聯(lián)合實(shí)驗(yàn)室，湖南長沙410083

3株洲鉆石切削刀具股份有限公司，湖南株洲412007

Author(s):

ZHANG Cong1; 2;  ZHANG Weibin1; 2;  PENG Yingbiao1; 2;  CHEN Weimin1; 2; ZHOUPeng1; 2;  LI Na1; 2; CHENG Kaiming1; 2; CHEN Li1; 2;  ZHANG Lijun1; 2; LIU Shuhong1; 2;  DU Yong1; 2;  WANG Shequan3;  WEN Guanghua3;  XIE Wen3

1 State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

2 Sino-German Cooperation Group “Microstructure”, Central South University, Changsha 410083, China

3 Zhuzhou Cemented Carbide Cutting Tools Limited Company, Zhuzhou, Hunan 412007, PR China

關(guān)鍵詞:

硬質(zhì)合金; 熱力學(xué); 動力學(xué); 數(shù)據(jù)庫; 計(jì)算模擬; 應(yīng)用

DOI:

10.7502/j.issn.1674-3962.2015.01.01

文獻(xiàn)標(biāo)志碼:

A

摘要:

硬質(zhì)合金是由難熔金屬化合物和粘結(jié)相通過粉末冶金工藝制成的材料，它具有硬度高、耐磨、強(qiáng)度和韌性好、耐熱、耐腐蝕等一系列優(yōu)良性能。本文介紹了包含C?Co?Cr?W?Ta?Ti?Nb?N等元素的硬質(zhì)合金熱力學(xué)和動力學(xué)數(shù)據(jù)庫。簡述了熱力學(xué)數(shù)據(jù)庫中的熱力學(xué)模型和優(yōu)化計(jì)算，并以C?Cr?Ta三元系為例介紹了熱力學(xué)優(yōu)化計(jì)算的方法和步驟。所建立的硬質(zhì)合金動力學(xué)數(shù)據(jù)庫包含液相和fcc相不同元素的原子遷移參數(shù)。利用修正的Sutherland方程對液相的原子遷移參數(shù)進(jìn)行了評估，而fcc相原子遷移參數(shù)是基于對實(shí)驗(yàn)測定數(shù)據(jù)和文獻(xiàn)數(shù)據(jù)的評估獲得的。利用建立的硬質(zhì)合金熱力學(xué)和動力學(xué)數(shù)據(jù)庫，可以計(jì)算多元系的相平衡、獲取不同相的熱力學(xué)性質(zhì)和溶解度信息、模擬合金中元素和相的分布等。該數(shù)據(jù)庫可用于設(shè)計(jì)合金成分和燒結(jié)溫度、預(yù)測元素含量及燒結(jié)氣氛等對梯度硬質(zhì)合金形成的影響、優(yōu)化合金燒結(jié)工藝等。本文最后指出相圖熱力學(xué)和擴(kuò)散動力學(xué)數(shù)據(jù)庫及熱物性數(shù)據(jù)庫結(jié)合相場、有限元方法，定量描述硬質(zhì)合金結(jié)構(gòu)?性能的關(guān)系是今后的發(fā)展趨勢。

Abstract:

Cemented carbides, whichconsist of refractory compounds and binder phase, are produced through powder metallurgy process.They show high hardness, wear resistance, strength with good toughness, heat resistance, corrosion resistance and a series of excellent performance. This paper presents developed thermodynamic and diffusion databases for multicomponent cemented carbides.The databases cover the system C?Co?Cr?W?Ta?Ti?Nb?N.The thermodynamic models and assessments are briefly introduced. The C?Cr?Ta ternary system is shown as an example to describethe procedure of thermodynamic assessment. The diffusion database contains atomic mobility parameters for different diffusing elements in liquid and fcc phases. The atomic mobility parameters in liquid phase are theoretically calculated by the modified Sutherland equation, and atomic mobility parameters in fcc phase are optimized according tothe presently measured diffusivities and the literature data. The developed thermodynamic and diffusion databasescan be used to calculate phase equilibria in multicomponent alloys, simulate the distribution of elements and phases in alloys.Consequently, the databasesare suitable for realizing applications as controlling the alloy composition and sintering temperature, predicting the effect of elements content and sintering atmosphere on the formation of graded cemented carbides, designing and optimizing sintering process for cemented carbides.It is expected that a quantitative description of the relationship between the structure and performancethrougha combination of thermodynamic, diffusion and thermophysical databases with phase field model and finite element method is the main focus for the future development of cemented carbides.