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Abstract

The effect of temperature on the lattice constants of martensite and ferrite are studied by the synchrotron radiation technique. The results show that the lattice constants of martensite and ferrite increase gradually with the increase of temperature, but diffraction peaks of martensite show a peak splitting phenomenon, while the diffraction peaks of ferrite do not. From the fitting of the {110} and {200} diffraction peaks of martensite, it is found that the lattice constants aand cof martensite gradually increase with the temperature rising, but the increasing rate of lattice constant ais faster than that of c, that is, the squareness of martensite gradually decreases. When the temperature increases to 500 ℃, the squareness ( c/ a) of martensite is equal to 1. The variation of lattice constant of ferrite with temperature is basically the same as that of lattice constant aof martensite, but different from that of lattice constant cof martensite, showing the nature influence of temperature on the lattice constants of martensite. Besides, based on the analysis of synchrotron radiation data, the quantitative equations of lattice constants of martensite and ferrite varying with temperature are established.

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Corresponding author:Song Xi-Ping,xpsong@skl.ustb.edu.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant Nos. 21171018, 51271021) and the Foundation of State Key Laboratory for Advanced Metals and Materials, China (Grant Nos. 2019-ZD06, 2021Z-18)

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晶格常数		温度/℃
晶格常数		25	200	400	500	600	650	700
{110}	a₁	2.8762	2.8877	2.8932	—	—	—	—
	c₁	2.8844	2.8942	2.8957	—	—	—	—
	a₃	—	—	—	2.8981	2.9023	2.9063	2.9071
	c/a	1.0029	1.0023	1.0009	1	1	1	1
{200}	a₂	2.8791	2.8906	2.8933	—	—	—	—
	c₂	2.8924	2.8982	2.9002	—	—	—	—
	a₄	—	—	—	2.8984	2.9022	2.9056	2.9074
	c/a	1.0046	1.0026	1.0024	1	1	1	1

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晶格常数	温度/℃
晶格常数	25	200	400	500	600	650	700	750	775
a_F	3.8785	2.8942	2.8979	2.9018	2.9077	2.9106	—	—	—
a_A	—	—	—	—	3.6612	3.6640	3.6672	3.3701	3.6706

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Vol. 71, Issue 9 - 2022-05-05

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