Abstract

An analysis of mechanical properties has been performed for 12% Cr and 9% Cr steels by means of tension tests at 20 and 650°C and yield tests at 650°C and applied stresses of 200–100 MPa with a step of 20 MPa. The yield strength and ultimate tensile strength of the 12% Cr steel are, correspondingly, 614 and 710 MPa at 20°С and 365 and 390 MPa at 650°C. At both temperatures, the strength properties of the 12% Cr steel under tension are better than for the 9% Cr steel due to higher values of contributions from solid-solution hardening (+30 MPa) and substructural hardening (+23 MPa) to the room-temperature yield strength. The analysis of creep properties shows that the time to fracture at high stresses for the 12% Cr steel is much longer than for the 9% Cr steel due to a more prolonged transient creep stage and, at low applied stresses, there is almost no difference in the creep behavior of the 12% Cr and 9% Cr steels. The 1% creep limit estimated from the empirical dependence between the stress and the time required to attain the strain with a degree of 1% for the 12% Cr steel is 82 MPa, being comparable with the 1% creep limit of the 9% Cr steel.

中文翻译：

---

耐热共修饰的12％和9％Cr钢的力学性能分析

摘要

通过在20和650°C下进行拉伸试验，在650°C下进行屈服试验，以200 MPa施加100-100 MPa的应力，对12％Cr和9％Cr钢进行了机械性能分析。12％Cr钢的屈服强度和极限抗拉强度分别在20°C下为614和710 MPa，在650°C下为365和390 MPa。在这两个温度下，由于固溶硬化（+30 MPa）和亚结构硬化（+23 MPa）对合金的贡献值较高，因此12％Cr钢在拉伸下的强度性能优于9％Cr钢。室温屈服强度。蠕变性能分析表明，由于更长的瞬态蠕变阶段以及在较低的施加应力下，含12％Cr的钢在高应力下的断裂时间比含9％Cr的钢要长得多。12％Cr和9％Cr钢的蠕变行为几乎没有差异。根据应力与12％Cr钢达到1％应变所需时间之间的经验相关性估算出的1％蠕变极限为82 MPa，与9％Cr的1％蠕变极限相当钢。