文章信息/Info

Title:

Optimization and design of preparation process for Ni-based superalloys based on the phase-field simulation

作者:

曹東甲; 塔娜; 杜勇; 張利軍

中南大學(xué) 粉末冶金國家重點實驗室，湖南 長沙 410083

Author(s):

CAO Dongjia;  TA Na;  DU Yong;  ZHANG Lijun

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

關(guān)鍵詞:

鎳基高溫合金; 微結(jié)構(gòu); 相場模擬; CALPHAD; 熱處理機制; 材料設(shè)計

DOI:

10.7502/j.issn.1674-3962.2015.01.05

文獻標志碼:

A

摘要:

材料制備過程中微結(jié)構(gòu)演變的定量描述是材料設(shè)計的核心。近年來基于精準熱力學(xué)和擴散動力學(xué)數(shù)據(jù)庫的相場模擬是對微結(jié)構(gòu)演變進行定量描述一種行之有效的方法。作為航空發(fā)動機和燃氣渦輪葉片等高溫零部件的主要用材，高性能鎳基高溫合金制備工藝的優(yōu)化及設(shè)計一直是各國材料學(xué)者研究的熱點和難點。本文首先概述了相場方法及其最新研究進展，以及相場法與CALPHAD（CALculation of PHAse Diagram）數(shù)據(jù)庫耦合技術(shù)的發(fā)展，隨后詳細介紹了國內(nèi)外有關(guān)鎳基高溫合金凝固、固溶及時效過程微結(jié)構(gòu)演變定量相場模擬的報道，以及當前用于建立鎳基高溫合金微結(jié)構(gòu)與力學(xué)性能關(guān)系的可行方法。之后給出了兩個基于定量相場模擬對鎳基高溫合金固溶及時效熱處理機制進行優(yōu)化及設(shè)計的實例，進一步證明了相場模擬在高性能鎳基高溫合金設(shè)計中的重要作用。最后，本文指出了對鎳基高溫合金制備過程微結(jié)構(gòu)演變進行定量相場模擬以及后續(xù)工藝優(yōu)化和設(shè)計中存在的主要問題及發(fā)展趨勢。

Abstract:

Quantitative description of the microstructure during materials preparation is the key to material design. In recent years, the phase-field simulation coupling with the CALPHAD (CALculation of PHAse Diagram) thermodynamic and atomic mobility databases has become an effective way to quantitatively simulate the microstructure evolution. The Ni-based superalloys are widely used as the main candidates for the high-temperature parts in aircraft engines, gas turbine blades etc. and the optimization and design of their preparation processes has been always a research hotspot and challenge for materials researchers all over the world. The present paper starts from the outline of the phase-field method and its latest development, as well as the development of coupling technique between the phase-field method and CALPHAD databases. After that, the reports on quantitative phase-field simulation of microstructure evolution in Ni-based superalloys during solidification, solution and aging heat treatment available in the literature are described in detail, followed by presenting the feasible ways to establish the relationship between the microstructure and mechanical properties of Ni-based superalloys. Subsequently, two examples for demonstrating the optimization and design of the solution and aging heat treatments of Ni-based superalloys based on the quantitative phase-field simulation are given, further indicating the importance of the phase-field simulation in the design of high-performance Ni-based superalloys. Finally, the major problems and the development trends for the quantitative phase-field simulation of microstructure evolution and its subsequent processes optimization and design in Ni-based superalloys are also pointed out.