Improvement of Formability by Moderate Temperature Forming and Thermo-mechanical Process and Examination of Fatigue Properties of TRIP-aided Dual-phase Steel Sheets.

通过中温成形和热机械加工改善成形性以及 TRIP 辅助双相钢板的疲劳性能检查。

• 批准号: 03805060
• 负责人: SUGIMOTO Koh-ichi
• 金额: $ 1.02万
• 依托单位: Faculty of Textile Science and Technology, Sinshu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03805060/
• 关键词: Dual-phase steel; High strength steel; Retained austenite; TRIP; Stretch forming; Stretch flanging; Moderate temperature; Thermomechanical process; Low cycle fatigue; 疲労; 成形性; 疲労硬化; 張り出し性; 残留オ-ステナイト; 残留オ-ステナイトの安定性; (α+γ)2相域

TRIP-aided dual-phase steels (TDP steels) have been developed to improve safety and fuel efficiency by reducing vehicle weight. The purpose of the present investigation is to improve stretch-formability and stretch-flange-ability and to examine fatigue strength of TDP steels.The stretch-formability and stretch-flangeability of TDP steels were improved by moderate temperature forming at 20ﾟC to 200ﾟC. The lower Ms temperature of the retained austenite, the greater these formability and the lower the optimum forming temperature. Thermo-mechanical process in alpha+gamma region gave a significant amount of retained austenite and fine microstructure, but increased the retained austenite Ms temperature, particularly for low manganese and low sili-con steels.Great fatigue hardening appeared for TDP steels owing to strain induced transformation of the retained austenite and internal stress resulting from a difference of strength between matrix and second phase. The fatigue hardening decreased with increasing testing temperature. Higher fatigue limit compared to that of a conventional dual-phase steel was obtained at 100 to 200ﾟC. The reason is under investigation.

TRIP辅助双相钢（TDP钢）已被开发出来，以通过减轻车辆重量来提高安全性和燃油效率。为了改善TDP钢的拉伸成形性和拉伸翻边性并检测其疲劳强度，在20 ℃ ~ 200 ℃的温度范围内进行中温成形，以改善TDP钢的拉伸成形性和拉伸翻边性。残余奥氏体的Ms温度越低，这些可成形性越大，并且最佳成形温度越低。α + γ区的形变热处理使残余奥氏体量增加，显微组织细化，但使残余奥氏体Ms温度升高，特别是低锰低硅钢，由于残余奥氏体的应变诱发相变和基体与第二相强度差产生的内应力，TDP钢出现了较大的疲劳硬化。随着试验温度的升高，疲劳硬化率降低。在100 ~ 200 ℃下，获得了比常规双相钢更高的疲劳极限。原因正在调查中。

项目成果

Koh-ichi Sugimoto et al.: "Effect of Volume Fraction and Stability of Retained austenite on Ductility in TRIP-aided Dual-phase steel Sheets" ISIJ International. 32. 1311-18 (1992)

Koh-ichi Sugimoto 等人：“残余奥氏体的体积分数和稳定性对 TRIP 辅助双相钢板延展性的影响”ISIJ International。

杉本公一: "TRIP型複合組織鋼の微細組織に及ぼす2相域加工熱処理の効果(第2報加工温度と化学組成の影響)" 材料とプロセス(CAMP-ISIJ). 6. (1993)

Koichi Sugimoto：“两相加工热处理对 TRIP 型复合结构钢微观结构的影响（第二次报告：加工温度和化学成分的影响）”材料与工艺（CAMP-ISIJ）6。（1993）。

杉本公一: "TRIP型複合組織鋼の微細組織に対する(α+γ)2相域加工熱処理の効果" 材料とプロセス(CAMP-ISIJ). 4. 1947 (1991)

Koichi Sugimoto：“（α+γ）两相区加工热处理对 TRIP 型复合结构钢显微组织的影响”材料与工艺（CAMP-ISIJ）1947 年 4 月（1991 年）。

Koh-iuhi Sugimoto: "Effcl of Volume Fraction and Stability of Reaiued Austenite on Ductility in TRIP-aidid Dud-phase Steel Sheets." ISIJ Interrrational. 32. 1311-1318 (1992)

Koh-iuhi Sugimoto：“残余奥氏体的体积分数和稳定性对 TRIP 辅助哑相钢板延展性的影响”。

杉本公一: "変態誘起塑性(TRIP)型複合組織鋼の繰り返し変形挙動" 日本機械学会講演論文集. 910-62A. 146-148 (1991)

Koichi Sugimoto：“相变诱导塑性 (TRIP) 型复合结构钢的重复变形行为”，日本机械工程师学会会议记录 910-62A (1991)。