Thermal stability of retained austenite and mechanical properties of medium-Mn steel during tempering treatment

IF 3.1 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Journal of Iron and Steel Research(International) Pub Date : 2017-08-01 DOI:10.1016/S1006-706X(17)30123-1
Xiao-li Zhao , Yong-jian Zhang , Cheng-wei Shao , Wei-jun Hui , Han Dong
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引用次数: 13

Abstract

The thermal stability of retained austenite (RA) and the mechanical properties of the quenched and intercritical annealed 0.1C-5Mn steel with the starting ultrafine lamellar duplex structure of ferrite and retained austenite during tempering within the range from 200 to 500 °C were studied by X-ray diffraction (XRD), transmission electron microscopy (TEM) and tensile testing. The results showed that there was a slight decrease in the RA volume fraction with increasing tempering temperature up to 400 °C. This caused a slight increase in the ultimate tensile strength (UTS) and a slight decrease in the total elongation (TE); thus, the product of UTS to TE (UTS×TE) as high as 31 GPa • % was obtained and remained nearly unchanged. However, a portion of the RA began to decompose when tempered at 500 °C and thus caused a ∼35% decrease of the RA fraction and a ∼16% decrease of the value of UTS×TE. It is concluded that the ultrafine lamellar duplex structure is rather stable and the excellent combination of strength and ductility could be retained with tempering temperature up to 400 °C. Thus, thermal processes such as galvanization are feasible for the tested steel provided that their temperatures are not higher than 400 °C.

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中锰钢回火过程中残余奥氏体的热稳定性及力学性能
采用x射线衍射(XRD)、透射电镜(TEM)和拉伸试验研究了在200 ~ 500℃回火过程中,以铁素体和残余奥氏体为起始超细层状双相组织的0.1C-5Mn钢的残余奥氏体(RA)热稳定性和淬火及临界间退火后的力学性能。结果表明,当回火温度达到400℃时,RA体积分数随回火温度的升高而略有下降。这导致极限抗拉强度(UTS)略有增加,总伸长率(TE)略有下降;因此,UTS到TE (UTS×TE)的产物高达31 GPa•%,并且几乎保持不变。然而,在500℃回火时,一部分RA开始分解,从而导致RA分数下降~ 35%,UTS×TE值下降~ 16%。结果表明,当回火温度达到400℃时,超细层状双相组织具有较好的稳定性,并能保持较好的强度和塑性结合。因此,在温度不高于400°C的条件下,热处理(如镀锌)对测试钢是可行的。
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来源期刊
CiteScore
4.30
自引率
0.00%
发文量
2879
审稿时长
3.0 months
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