Accession Number : ADA295659

Title :   Effect of Austemper Heat Treatment on Weld Heat Affects Zones of Cast Ductile Iron.

Descriptive Note : Technical rept.

Corporate Author : ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL N J CLOSE COMBAT ARMAMENTS CENTER

Personal Author(s) : Luckowski, Stephen ; Scullin, George ; Stanton, Roger

PDF Url : ADA295659

Report Date : MAY 1995

Pagination or Media Count : 53

Abstract : This report is the first of a three year Army Manufacturing, Science, and Technology (MS&T) Congressionally mandated effort to investigate the weldability of a specific grade of austempered ductile iron (ADI). This specific grade of ductile iron was developed under MS&T project 5904948 and has mechanical properties after austemper heat treatment of 140,000 psi minimum yield strength and 80/c minimum elongation. This report describes the use of the Gleeble experimental technique to produce the thermal cycles experienced in welding, thus creating simulated weld heat affected zones (HAZ). Simulated HAZ were produced for two different weld energy inputs and five weld preheat temperatures. Weldability was assessed by measuring resultant hardness and through microstructural observations of the as-welded and subsequently austempered material. Results of this work provide a foundation of knowledge in the as- welded heat affected zone, determine the extent of recovery of the weld (HAZ) due to subsequent austemper heat treatment, and provide information on suitable preheat temperatures and weld energy inputs for actual weld trials. jg

Descriptors :   *HEAT TREATMENT, *IRON, *DUCTILITY, *CASTINGS, *WELDABILITY, THERMAL PROPERTIES, SIMULATION, METALS, MECHANICAL PROPERTIES, RECOVERY, MICROSTRUCTURE, MANUFACTURING, ENERGY, CYCLES, WELDS, LABORATORY PROCEDURES, YIELD STRENGTH, ARMY, ELONGATION, WELDING.

Subject Categories : Thermodynamics
      Inorganic Chemistry
      Physical Chemistry
      Fabrication Metallurgy
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE