Stress relaxation mechanism of 1Cr18Ni9 steel helical compression spring

doi:10.13251/j.issn.0254-6051.2022.01.018

Abstract

Abstract: In order to find the main reasons for the excellent resistance to stress relaxation of helical compression spring made of 1Cr18Ni9 austenitic stainless steel, stress relaxation tests at 100, 140, 180, and 220 ℃ were carried out. It is found that the free length of the spring changes little after relaxation test, butthe inflection point between the first stage and the second stage is not obvious during the process of relaxation at 100 ℃, which can be attributed to the difference in relaxation mechanism at different temperatures. Besides, the plastic deformation in 1Cr18Ni9 austenitic stainless steel helical compression spring is mainly multi-slip of dislocation under 100 ℃, but the plastic deformation occurs in a combination way of multiple slip and twinning at elevated temperatures.

Key words: 1Cr18Ni9 steel, stress relaxation, relaxation mechanism, plastic deformation

CLC Number:

TG142.75

Nong Xin, Gao Jinzhong, Wu Junwu, Shi Chunsheng, Zhao Naiqin. Stress relaxation mechanism of 1Cr18Ni9 steel helical compression spring[J]. Heat Treatment of Metals, 2022, 47(1): 106-112.

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