合金元素配分对珠光体相变热动力学及其奥氏体化影响的研究进展

doi:10.11868/j.issn.1001-4381.2020.000100

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珠光体相变及其奥氏体化作为涉及三相、两界面的复杂相变过程，其相变过程和物理本质仍有待探索和研究。本文综述了合金钢中珠光体的相变过程，阐述了间隙型合金元素C和置换型合金元素M在相变过程中的配分行为，并介绍了相场模拟在珠光体相变过程中的应用。基于本课题组前期大量的实验和计算结果，进一步讨论了组织与成分的不均匀性对于珠光体逆奥氏体化相变的影响，由于C与M在扩散系数上存在巨大差异，使得该过程中存在动力学发生显著变化的临界转变温度（PNTT）。在此基础上，本文创新性地提出了一种近共析成分含锰钢的热处理工艺，相比于传统Q&P工艺可极大地提高Mn在残余奥氏体中的富集程度，进而提高奥氏体稳定性，为更加系统深入地调控马氏体/奥氏体双相钢组织提供理论指导。

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	杨泽南
	李赛
	于俊杰
	谢强
	王祯
	张明达
	董浩凯
	张强
	杨志刚

关键词 ：珠光体相变, 奥氏体化, 热力学, 动力学, 合金元素配分

Abstract：

Pearlite transformation and its re-austenitization process, which involve triple phases and dual phase interfaces, have been considered difficult phase transformation processes. Thus, the mechanism and physical nature of them are waiting to be studied. The partition of carbon and substitutional alloying element M during transformation by integrating the previous results were clarified. Moreover, the application of phase field method in the pearlite transformation was introduced. Based on the large amount of the experimental and calculated results, the influence of the inhomogenous microstructure and composition on the re-austenitization from pearlite were further discussed. Partitional and non-partitional transformed temperature (PNTT), which is due to the large difference of diffusion coefficient between C and M, was further studied. Based on this, a new heat treatment of near-eutectoid Mn-contained steel has been put forward. The segregation of Mn in retained austenite can be significantly improved compared to the traditional Q&P treatment, and then the stability of the retained austenite can be enhanced and the guidance can be provided for controlling the martensite/austenite dual phase microstructure more systematically.

Key words： pearlite transformation austenitization thermodynamic kinetics alloying element partition

收稿日期: 2020-02-11 出版日期: 2020-07-21

中图分类号:	TG113
	TG142
	TG156

基金资助:国家自然科学基金资助项目(51771100)

通讯作者: 杨泽南 E-mail: yangzn719@126.com

作者简介: 杨泽南(1990-), 男, 工程师, 博士, 主要研究方向为相变热力学与动力学, 联系地址:北京市81信箱1分箱(100095), E-mail:yangzn719@126.com

引用本文:

杨泽南, 李赛, 于俊杰, 谢强, 王祯, 张明达, 董浩凯, 张强, 杨志刚. 合金元素配分对珠光体相变热动力学及其奥氏体化影响的研究进展[J]. 材料工程, 2020, 48(7): 61-71.
Ze-nan YANG, Sai LI, Jun-jie YU, Qiang XIE, Zhen WANG, Ming-da ZHANG, Hao-kai DONG, Qiang ZHANG, Zhi-gang YANG. Progress in effect of alloying element partition on thermodynamics and kinetics of pearlite transformation and its austenitization. Journal of Materials Engineering, 2020, 48(7): 61-71.

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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2020.000100 或 http://jme.biam.ac.cn/CN/Y2020/V48/I7/61

Table 1 奥氏体中不同合金元素Wagner相互作用系数ε^M_c(T=700 ℃)^[11]

Fig.1 实验测得等温珠光体相变温度对M配分系数k^θ/α的影响
(a)Fe-0.80C-1.08Mn和Fe-0.69C-1.80Mn^[5]; (b)Fe-0.81C-1.41Cr^[6]; (c)Fe-0.84C-1.94Si^[12]；(d)Fe-0.82C-2.20Co^[7]; (e)Fe-0.70C-2.18Ni^[10]; (f)Fe-0.60C-1.02Mn-1.05Cr^[13]

Fig.2 Fe-0.82C-1.29Cr合金在700 ℃及720 ℃等温珠光体M元素配分系数k^θ/α随等温时间变化关系^[14]

Fig.3 局域平衡理论下等温珠光体相变模式图^[2]

Fig.4 Fe-C二元合金珠光体相变的组织演化(a)，(b)与C扩散场(c)，(d)^[28](ΔT=30 ℃，λ=0.3 mm)

Fig.5 碳扩散对等温珠光体相变动力学的影响^[28]

Fig.6 垂直于珠光体片层方向的奥氏体长大动力学模拟示意图^[49]
(a)单侧形核模式；(b)双侧形核模式

Fig.7 层片状珠光体在800 ℃等温不同时间后奥氏体化SEM形貌^[54]
(a)Fe-0.6C-1Cr合金, t=4.6 s；(b)Fe-0.6C-1Mn合金, t=1.1 s

Fig.8 Fe-0.6C-2Mn合金层片状珠光体800 ℃奥氏体化1.4 s后淬火组织^[39]

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