Microstructure control and ultra-high strengthening of stainless steel by the room temperature recrystallization

室温再结晶不锈钢的显微组织控制和超高强化

• 批准号: 10450263
• 负责人: AMEYAMA Kei
• 金额: $ 5.44万
• 依托单位: Ritsumeikan University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10450263/
• 关键词: Powder Metallurgy; Stainless Steel; HS-PM Process; Reemystallization; Hachanical Property; Strength; Microstructure; Grain Refinement; 粉末治金; 超強加工; 相変態; 超高強度化; フェライト変態; 組織制御; 結晶粒微細化; 射出成形; 積層欠陥エネルギー

The high strain powder metallurgy (HS-PM) process is a novel powder metallurgy process combining mechanical milling (MM) or mechanical alloying (MA), heat treatment and sintering processes, and enables one to produce an ultra-fine grain structure. It has three remarkable features : [1] a non equilibrium phase, [2] a nano grain microstructure, and [3] good workability. The extremely high strain energy given by the milling process at room temperature produces a large number of defects and this enhances the diffusion of atoms at low temperature and contributes to the formation of a non equilibrium phase such as a supersaturated solid solution or an amorphous phase. A nano grain structure is obtained from the non-equilibrium phases by controlling the heat treatment conditions, which influences the phase transformation, recovery, recrystallization, grain growth, etc (2). Grain refinement is very important to improve the mechanical properties of materials, and fine grained materials easily deform by superplasticity. Therefore, the HS-PM process is the most efficient and useful non-equilibrium powder metallurgy process because it permits simultaneous improvement of mechanical properties and workability by the control of microstructure.In this report, the HS-PM process was applied to an SUS316L stainless steel, and the mechanical properties of the material at room temperature as well as the microstructural changes during the process are discussed. The HIP compact of the HS-PM processed powder showed ultra-fine microstructure with a homogeneously dispersed σphase. The HIP compact also showed outstanding mechanical properties at room temperature as well as at the elevated temperatures.

高应变粉末冶金（HS-PM）工艺是一种结合机械铣削（MM）或机械合金化（MA）、热处理和烧结工艺的新型粉末冶金工艺，能够产生超细晶粒结构。它具有三个显着特点：[1]非平衡相，[2]纳米晶粒微观结构，[3]良好的加工性。室温下铣削过程产生的极高应变能会产生大量缺陷，这会增强原子在低温下的扩散，并有助于形成非平衡相，例如过饱和固溶体或非晶相。通过控制热处理条件，非平衡相获得纳米晶粒结构，影响相变、回复、再结晶、晶粒长大等(2)。晶粒细化对于提高材料的力学性能非常重要，细晶粒材料容易发生超塑性变形。因此，HS-PM工艺是最有效和最有用的非平衡粉末冶金工艺，因为它可以通过控制微观结构同时提高机械性能和可加工性。在本报告中，HS-PM工艺应用于SUS316L不锈钢，讨论了材料在室温下的机械性能以及工艺过程中的微观结构变化。 HS-PM 加工粉末的 HIP 压坯显示出具有均匀分散的 σ 相的超细微观结构。 HIP 复合材料在室温和高温下也表现出出色的机械性能。

项目成果

飴山 惠: "高ひずみ付加PMプロセスによる結晶粒微細化と高強度化" 塑性と加工. 39. 911-914 (1998)

Kei Ameyama：“通过高应变粉末冶金工艺实现晶粒细化和高强度改进”《塑性与加工》39. 911-914 (1998)。

H.Fujiwara and K.Ameyama: "Nano-Grain Formation in a Fully Ferritic SUS316L Austenitic Stainless Steel Produced by HS-PM Process"Materials Science Forum. Vol.304-306. 47-52 (1999)

H.Fujiwara 和 K.Ameyama：“采用 HS-PM 工艺生产的全铁素体 SUS316L 奥氏体不锈钢中的纳米晶粒形成”材料科学论坛。

K.Ameyama, S.Senoo,J.Sudo, O.Okada, K.Nakata: "MICROSTRUCTURE AND MECHANICAL PROPERTIES OF SUS316L STAINLESS STEEL MANUFACTURED BY HIGH STRAIN PM PROCESS"Advanced Materials and Processing, The Minerals, Metals & Materials Society. 107-112 (1998)

K.Ameyama、S.Senoo、J.Sudo、O.Okada、K.Nakata：“高应变粉末冶金工艺制造的 SUS316L 不锈钢的微观结构和机械性能”先进材料与加工、矿物、金属

K.Ameyama, S.Senoo, J.Sudo, O.Okada, K.Nakata: "MICROSTRUCTURE AND MECHANICAL PROPERTIES OF SUS316L STAINLESS STEEL MANUFACTURED BY HIGH STRAIN PM PROCESS"Advanced Materials and Processing, The Minerals, Metals, & Materials Society. 107-112 (1998)

K.Ameyama、S.Senoo、J.Sudo、O.Okada、K.Nakata：“高应变粉末冶金工艺制造的 SUS316L 不锈钢的微观结构和机械性能”先进材料与加工、矿物、金属、