文章信息/Info

Title:

An Overview of Interphase Precipitation of Nano-Carbide in Low Alloy Steels

作者:

董浩凱; 陳浩; 張弛; 楊志剛

(清華大學(xué)材料學(xué)院先進(jìn)材料教育部重點(diǎn)實(shí)驗(yàn)室，北京 100084)

Author(s):

DONG Haokai;  CHEN Hao;  ZHANG Chi;  YANG Zhigang

(Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China)

關(guān)鍵詞:

相間析出; 碳化物; 低合金鋼; 模型; 工業(yè)應(yīng)用

Keywords:

interphase precipitation;  carbide;  low alloy steel;  model;  industrial application

DOI:

10.7502/j.issn.1674-3962.2018.06.01

文獻(xiàn)標(biāo)志碼:

A

摘要:

低合金鋼中的相間析出現(xiàn)象自發(fā)現(xiàn)以來(lái)，憑借其獨(dú)特的相變模式及規(guī)則分布的析出產(chǎn)物在學(xué)術(shù)界得到了廣泛的關(guān)注。近年來(lái)又憑借其強(qiáng)度貢獻(xiàn)高、擴(kuò)孔性能好等優(yōu)點(diǎn)而受到了汽車(chē)行業(yè)的廣泛青睞。然而由于對(duì)其背后的物理機(jī)制尚不清楚，從而對(duì)相間析出型高強(qiáng)鋼的組織調(diào)控和性能優(yōu)化提出了挑戰(zhàn)。本文首先歸納了相間析出的典型形貌特征，描述了析出相的片間距、尺寸隨溫度的變化趨勢(shì)；隨后重點(diǎn)介紹了已有的解釋相間析出現(xiàn)象的各類(lèi)模型，并指出其存在的局限性，同時(shí)提出了在基于溶質(zhì)拖曳理論的基礎(chǔ)上可定量描述鐵素體長(zhǎng)大與碳化物析出耦合相變動(dòng)力學(xué)的建模設(shè)想；最后介紹了相間析出在工業(yè)上的應(yīng)用，展望了其未來(lái)在含鐵素體相高強(qiáng)鋼的強(qiáng)度提升及抗氫脆性能方面具有廣闊的應(yīng)用前景。

Abstract:

Since the discovery of interphase precipitation (IP) in low alloy steels, it has received extensive attention in academia due to its unique phase transformation mode and regular distribution of precipitated products. In recent years, it has been widely favored by the automotive industry with its superior strength reinforcement and excellent stretch flange formability. However, owing to its unclarified physical mechanism, a challenge is posed for the microstructure control and performance optimization of interphase precipitated steels. In this paper, the typical morphologies of IP were summarized firstly, combining with the description of the inter-sheet spacing and particle size variation with temperatures. Subsequently, the emphasis was mainly placed on the introduction of various models for explaining the IP, together with the raise of their limitations. Moreover, a modeling assumption based on the solute drag theory was proposed to quantitatively describe the kinetics of coupled phase transformation between ferrite growth and carbide precipitation. Finally, the industrial application of IP was introduced. Its broad application outlook for strength enhancement and hydrogen embrittlement resistance of high-strength ferritic steel was also prospected.