王洋, 王欢, 张朝磊, et al. Structure and Characteristics of Special Steel RL40 for Flexspline of Harmonic Reduction Gear[J]. Special Steel, 2021, 42(3): 76-78.
王洋, 王欢, 张朝磊, et al. Structure and Characteristics of Special Steel RL40 for Flexspline of Harmonic Reduction Gear[J]. Special Steel, 2021, 42(3): 76-78.DOI:
austenite grain coarsening and phase transformation point of RL40 steel for flexpline (/% :0.40C
0.90Cr
l. 85Ni
0.25Mo
0.05Nb
0.016Ti) has been studied by the quantitative analysis of optical microscopy and thermal expansion experiment. The results show that the microstructure of the rolled bar is bainite + martensite
the average grain size of primary austenite is 14. 0 μm
and the austenite grain size rating is 9. 0 ~ 9. 5
and the average standard deviation is 0. 46 ~ 0. 048. The transformation point Ac
1
is 729 ℃
Ac
3
is 769 ℃
Ms is 28 ℃
and the austenite grain coarsening temperature is 1 000 ℃.