The precipitation behavior of different phases in a high-silicon stainless steel (6 wt% Si) during aging at 600–1050 °C for 24 h was investigated. The morphology, crystal structure and composition of various precipitates were detailly characterized using optical microscopy, scanning electron microscopy and transmission electron microscopy. Four phases were mainly identified: χ-phase, M₆C carbides, σ phase and a new type of fcc-phase. During aging at 600–900 °C, the main precipitate was (Cr, Mo and Si)-rich χ-phase which was directly precipitated from γ matrix. The χ-phase was calibrated as bcc structure with a lattice parameter of 8.90 Å. The peak temperature for the precipitation of χ-phase was 800 °C, and it was dissolved when aging at temperatures above 1000 °C. The σ-phase was observed only at 700 °C and grew next to χ-phase. Above 700 °C, a new fcc-phase was found to be precipitated along with χ-phase, with a space group of Fd3c and a lattice parameter of 12.56 Å. The M₆C carbides started to be precipitated at 700 °C in the vicinity of χ-phase. And its amount basically increased with the increasing of temperature. An orientation relationship between M₆C/γ was found: [100]c//[100]γ, (001)c//(001)γ, i.e., the cube-on-cube relationship.

研究了高硅不锈钢（6 wt％Si）在600–1050°C时效24 h时不同相的析出行为。使用光学显微镜，扫描电子显微镜和透射电子显微镜详细表征了各种沉淀物的形态，晶体结构和组成。主要确定了四个相：χ相，M ₆ C碳化物，σ相和新型的fcc相。在600–900°C时效期间，主要沉淀物是富含（Cr，Mo和Si）的χ相，其直接从γ基质中沉淀出来。该χ相被校准为bcc结构，晶格参数为8.90。χ相沉淀的峰值温度为800°C，在1000°C以上的温度下老化时会溶解。所述σ -PHASE仅观察到在700℃和旁边长大χ -PHASE。高于700°C，发现新的fcc相与χ相一起析出，其空间群为Fd3c，晶格参数为12.56Å。的中号₆开始C碳化物在700℃时在附近，析出χ -PHASE。随着温度的升高，其含量基本增加。M之间的取向关系发现₆ C / γ：[100] c // [100] γ，（001）c //（001）γ，即，立方对立方关系。