Title

Development Of Columbium-Base Alloys

Date

1963

Index Abstract

Coming Soon

Photo Quality

Complete

Report Number

WADC TR 57-344 Part 7

Creator

Begley, Richard T.

Godshall, John L.

Stickler

Buckman, R. William

Corporate Author

Westinghouse Electric Corp Pittsburgh PA

Laboratory

Directorate of Materials and Processes

Extent

107

Identifier

AD0410771

Access Rights

OTS

Distribution Classification

1

Contract

AF 33(616)-6258

DoD Project

7351 - Metallic Materials

DoD Task

735101

DTIC Record Exists

No

Distribution Change Authority Correspondence

None

Abstract

The influence of carbon additions on the proper ties of a complex niobium alloy, Nb-10W-5V-1Zr (B-77), was investigated. Carbon additions of 0.077 and 0.15 w/o refined the as-cast grain size and increased hardness. For the conditions of heat treatment investigated, the carbon level had no effect on the 1205 C (2200 F) stress rupture strength of B-77, but the carbon containing al loys had higher rupture strains than low carbon B-77. Heat treatment studies did not show any evidence of precipitation hardening effects, however solution annealed and cold rolled B-77 0.15 C material gave significantly higher hot hardness values than solution annealed materials, suggesting that carbide precipitation on disloca tions was contributing to high temperature strength. Preliminary data showed grain boundary sliding occurred in B-77 during creep testing at 1205 C (2200 F).

Report Availability

Full text available

Date Issued

1963-04

Provenance

Lockheed Martin Missiles & Fire Control

Type

report

Format

1 online resource