Correlation of the High-Temperature Corrosion Behavior of Structural Alloys in Coal Conversion Environments with the Components of the Alloys and of the Corrosive Environments. Final Report, February 29, 1980

摘要

This program was established at Battelle's Columbus Laboratories to provide information on the effects of a wide range of simulated coal gasifier atmospheres on the high-temperature corrosion behavior of a small number of alloys, to supplement existing alloy screening programs in this area. Four alloys: Inconel 671; AISI 310; Incoloy 800 and USS 18-18-2, were exposed in a series of statistically-designed experiments for times up to 1000 h in simulated coal gasifier atmospheres at total pressures of 500, 1000 and 1500 psig, and at temperatures of 1382, 1600 and 1800 exp 0 F. Some data were also generated for alloys GE 1541 and Sandvik 253 MA. The progress of corrosion was evaluated by standardized metallographic techniques, with effects on mechanical properties assessed by post-test tensile tests. The data generated were statistically analyzed to determine trends. The results indicated that increasing temperature exerted a significant effect by increasing the extent of corrosion of Inconel 671, Incoloy 800 and USS 18-18-2, whereas increasing total pressure caused a significant decrease in the extent of corrosion of Incoloy 800 and AISI 310. Temperature was the most important variable affecting the tensile strength of the corroded specimens; the ultimate tensile strength of Inconel 671, AISI 310 and USS 18-18-2 increased (relative to aged specimens) with increasing temperature, suggesting that some corrosion morphologies may not be significantly detrimental. Decreasing total pressure from 1500 to 500 psig exerted a significant effect on the UTS of USS 18-18-2 only, causing a decrease. (ERA citation 05:028267)