Grain size control of 316H austenitic stainless steel forgings for nuclear power

doi:10.13251/j.issn.0254-6051.2021.04.035

Abstract

Abstract: Aiming at the problem of grain coarsening and mixed grains in 316H austenitic stainless steel forgings, the effects of forging temperature, deformation and solution heat preservation temperature on grain size of 316H steel were studied. The results show that the grain size of the forging in the core is finer than that at 1/4 diameter, while that at 1/4 diameter is finer than that at the forging surface. The increase of the forging temperature and the amount of deformation promote the occurrence of dynamic recrystallization, which is very significant for the grain refinement. When the forging temperature is 1100 ℃ and with 30% deformation, the grain size after forging can reach about grade 7. The heat treatment has a certain homogenization effect on the grain size, however, too high heat treatment temperature will cause grain growth, so the heat treatment temperature should be controlled in the range of 1040-1060 ℃.

Key words: 316H stainless steel, grain size, forging temperature, deformation, heat treatment temperature

CLC Number:

TG156.94

Ran Xiongbo, Liu Hongling, Wang Hongyu, Cao Junsheng, Liang Qichao, Hou Chaoqian. Grain size control of 316H austenitic stainless steel forgings for nuclear power[J]. Heat Treatment of Metals, 2021, 46(4): 192-195.

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