α-γ 2 相ステンレス鋼の応力腐食割れ挙動におよぼす冷間加工と熱処理およびフェライト量の影響

概要

論文の詳細を見る
The effects of cold rolling, heat treatment and volume fraction of ferrite on stress corrosion cracking (SCC) behavior of duplex stainless steel have been studied with means of U-bend method in boiling 42% MgCl_2 solution. The main results obtained are as follows : (1) SCC susceptibitity of the solution treated material is small at about 50% α, but it has a tendency to be increased with either way of increase or decrease of α content from about 50% α. Solution treatment temperature resulting in abrupt increase of SCC susceptibility shifts to higher temperature with the decrease of α content. (2) SCC susceptibility is increased by grain growth of α and γ that occurred with extension of holding time at solution temperature, and otherwise, by cold work in the case of the materials having much volume fraction of α. (3) On aging at 475℃, the hardness is increased by spinodal decomposition of α. The crack resistance increases remarkably with the progress of aging in the case of materials having much α, and corresponds to age hardening bchavior. (4) In the case of heating at 700℃, the SCC behavior of aged materials has not been made clear by U-bend method because of σ embrittlement.
社団法人日本鉄鋼協会の論文
1981-02-01